id
stringlengths 12
12
| format
stringclasses 2
values | title_ko
stringlengths 0
811
⌀ | title_en
stringlengths 0
1.26k
⌀ | journal
dict | authors
listlengths 0
15
| abstract_ko
stringlengths 0
4k
⌀ | abstract_en
stringclasses 100
values | keywords
stringclasses 157
values | citation_count
stringclasses 5
values | doi
stringlengths 0
127
⌀ | url
stringclasses 101
values | file_source
stringlengths 23
23
|
|---|---|---|---|---|---|---|---|---|---|---|---|---|
ART001802933
|
oai_dc
|
Bending characteristics of corroded reinforced concrete beam under repeated loading
|
Bending characteristics of corroded reinforced concrete beam under repeated loading
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Congqi Fang(Shanghai Jiaotong University); Shuai Yang(Shanghai Jiaotong University); Zhang Zhang(Shanghai Third Harbour Engineering Science & Technology Research Institute CO.)"
] |
Bending behaviors of corroded reinforced concrete (RC) beams under repeated loading were investigated experimentally. A total of twenty test specimens, including four non-corrosion and sixteen corrosion reinforced concrete beams, were prepared and tested. A numerical model for flexural and cracking behaviors of the beam under repeated loading was also developed. Effects of steel corrosion on reinforced concrete beams regarding cracking, mid-span deflection, stiffness and bearing capacity of corroded beams were studied. The impact of corrosion on bond strength as the key factor was investigated to develop the computational model of flexural capacity. It was shown from the experimental results that the bond strength between reinforcement and concrete had increased for specimen of low corrosion levels, while this effect was changed when the corrosion level was higher. It was indicated that the bearing capacity of corrosion beam increased even at a corrosion level of about 5%.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001802939
|
oai_dc
|
Effects of thickness variations on the thermal elastoplastic behavior of annular discs
|
Effects of thickness variations on the thermal elastoplastic behavior of annular discs
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Yun-Che Wang(National Cheng Kung University); Sergei Alexandrov(Russian Academy of Sciences); Yeau-Ren Jeng(National Chung Cheng University)"
] |
Metallic annular discs with their outer boundary fully constrained are studied with newly derived semi-analytical solutions for the effects of thickness variations under thermal loading and unloading. The plane stress and axisymmetric assumptions were adopted, and the thickness of the disk depends on the radius hyperbolically with an exponent n. Furthermore, it is assumed that the stress state is two dimensional and temperature is uniform in the domain. The solutions include the elastic, elastic-plastic and plasticcollapse behavior, depending on the values of temperature. The von Mises type yield criterion is adopted in this work. The material properties, Young’s modulus, yield stress and thermal expansion coefficient, are assumed temperature dependent, while the Poisson’s ratio is assumed to be temperature independent. It is found that for any n values, if the normalized hole radius a greater than 0.6, the normalized temperature difference between the elastically reversible temperature and plastic collapse temperature is a monotonically decreasing function of inner radius. For small holes, the n values have strong effects on the normalized temperature difference. Furthermore, it is shown that thickness variations may have stronger effects on the strain distributions when temperature-dependent material properties are considered.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001802930
|
oai_dc
|
Experimental and analytical investigation on RC columns with distributed-steel bar
|
Experimental and analytical investigation on RC columns with distributed-steel bar
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mao Ye(Guangzhou University); Yinpei Pi(Guangzhou University); Min Ren(Guangzhou University)"
] |
Distributed-Steel Bar Reinforced Concrete (DSBRC) columns, a new and innovative construction technique for composite steel and concrete material which can alleviate the difficulty in the arrangement of the stirrup in the column, were studied experimentally and analytically in this paper. In addition, an ordinary steel Reinforced Concrete (SRC) column was also tested for comparison purpose. The specimens were subjected to quasi-static load reversals to model the earthquake effect. The experimental results including the hysteresis curve, resistance recession, skeleton curves and ductility ratio of columns were obtained, which showed well resistant-seismic behavior for DSBRC column. Meanwhile a numerical three-dimensional nonlinear finite-element (FE) analysis on its mechanical behavior was also carried out. The numerically analyzed results were then compared to the experimental results for validation. The parametric studies and investigation about the effects of several critical factors on the seismic behavior of the DSBRC column were also conducted, which include axial compression ratios, steel ratio, concrete strength and yield strength of steel bar.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001802932
|
oai_dc
|
Estimation of semi-rigid joints by cross modal strain energy method
|
Estimation of semi-rigid joints by cross modal strain energy method
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Shuqing Wang(Ocean University of China); Min Zhang(Ocean University of China); Fushun Liu(Ocean University of China)"
] |
We present a semi-rigid connection estimation method by using cross modal strain energy method. While rigid or pinned assumptions are adopted for steel frames in traditional modeling via finite element method, the actual behavior of the connections is usually neither. Semi-rigid joints enable connections to be modeled as partially restrained, which improves the quality of the model. To identify the connection stiffness and update the FE model, a newly-developed cross modal strain energy (CMSE) method is extended to incorporate the connection stiffness estimation. Meanwhile, the relations between the correction coefficients for the CMSE method are derived, which enables less modal information to be used in the estimation procedure. To illustrate the capability of the proposed parameter estimation algorithm, a four-story frame structure is demonstrated in the numerical studies. Several cases, including Semi-rigid joint(s) on single connection and on multi-connections, without and with measurement noise, are investigated. Numerical results indicate that an excellent updating is achievable and the connection stiffness can be estimated by CMSE method.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001800932
|
oai_dc
|
Composite locomotive frontend analysis and optimization using genetic algorithm
|
Composite locomotive frontend analysis and optimization using genetic algorithm
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"S.M. Rohani(Imam Hossein University); A. Vafaeesefat(Imam Hossein University); M. Esmkhani(Mapnalocomotive Company); M. Partovi(Mapnalocomotive Company); H.R. Molladavoudi(Mapnalocomotive Company)"
] |
This paper addresses the structural design of the front end of Siemens ER24 locomotive body. The steel structure of the frontend is replaced with composite. Optimization of the composite lay-up is performed using Genetic Algorithms. Initially an optimized single design for the entire structure is presented. Then a more refined optimum is developed by considering the separate optimization of 7 separate regions of the structure. Significant savings in the weight of the structure are achieved.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001800920
|
oai_dc
|
Neuro-fuzzy optimisation to model the phenomenon of failure by punching of a slab-column connection without shear reinforcement
|
Neuro-fuzzy optimisation to model the phenomenon of failure by punching of a slab-column connection without shear reinforcement
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mariam Hafidi(Houari Boumedienne University); Fattoum Kharchi(Houari Boumedienne University); Abdelouhab Lefkir(Polytechnic National School)"
] |
Two new predictive design methods are presented in this study. The first is a hybrid method, called neuro-fuzzy, based on neural networks with fuzzy learning. A total of 280 experimental datasets obtained from the literature concerning concentric punching shear tests of reinforced concrete slab-column connections without shear reinforcement were used to test the model (194 for experimentation and 86 for validation) and were endorsed by statistical validation criteria. The punching shear strength predicted by the neuro-fuzzy model was compared with those predicted by current models of punching shear, widely used in the design practice, such as ACI 318-08, SIA262 and CBA93. The neuro-fuzzy model showed high predictive accuracy of resistance to punching according to all of the relevant codes. A second, more userfriendly design method is presented based on a predictive linear regression model that supports all the geometric and material parameters involved in predicting punching shear. Despite its simplicity, this formulation showed accuracy equivalent to that of the neuro-fuzzy model.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001800913
|
oai_dc
|
Dynamic analysis of coupled train - ladder track - elevated bridge system
|
Dynamic analysis of coupled train - ladder track - elevated bridge system
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"He Xia(Beijing Jiaotong University); Yushu Deng(Beijing Jiaotong University); Chaoyi Xia(Beijing Jiaotong University); G. De Roeck(KU Leuven); Lin Qi(TESS Corporation Ltd); Lu Sun(Southeast University)"
] |
As a new type of vibration reduction, the ladder track system has been successfully used in engineering. In this paper, a numerical model of the train-track-viaduct system is established to study the dynamic responses of an elevated bridge with ladder track. The system is composed of a vehicle submodel, a track submodel and a bridge submodel, with the measured track irregularities as the system self-excitation. The whole time histories of a train running through an elevated bridge with 3×27m continuous PC box girders are simulated. The dynamic responses of the bridge such as deflections, lateral and vertical accelerations, and the vehicle responses such as derailment factors, offload factors and car-body accelerations are calculated. The calculated results are partly validated through the comparison with the experimental data. Compared to the common slab track, adapting the ladder sleeper can effectively reduce the accelerations of the bridge girder, and also reduce the car-body accelerations and offload factors of the train vehicle.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001800925
|
oai_dc
|
Durability characteristics of recycled aggregate concrete
|
Durability characteristics of recycled aggregate concrete
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Palaniraj Saravanakumar(SASTRA University); Govindasamy Dhinakaran(SASTRA University)"
] |
People started to replace natural aggregate with recycled aggregate for a number of years due to disposal problem and certain other potential benefits. Though there are number of drawbacks with use of recycled aggregates like lesser modulus of elasticity, low compressive strength, increase in shrinkage, there are results of earlier studies that use of chemical and mineral admixtures improves the strength and durability of recycled concrete. The use of recycled aggregate from construction and demolition wastes is showing prospective application in construction as alternative to natural aggregates. It conserves lot of natural resources and reduces the space required for the landfill disposal. In the present research work, the effect of recycled aggregate on strength and durability aspects of concrete is studied. Grade of concrete chosen for the present work is M50 (with a characteristic compressive strength of 50 MPa). The recycled aggregates were collected from demolished structure with 20 years of age. Natural Aggregate (NA) was replaced with Recycled Aggregate (RA) in different percentages such as 25, 50 and 100 to understand its effect. The experiments were conducted for different ages of concrete such as 7, 14, 28, 56 days to assess the compressive and tensile strength. Durability characteristics of recycled aggregate concrete were studied with Rapid chloride penetration test (as per ASTMC1202), sorptivity test and acid test to assess resistance against chloride ion penetration, capillary suction and chemical attack respectively. Mix design for 50 MPa gives around 35 MPa after replacing natural aggregate with recycled aggregate in concrete mix and the chloride penetration range also lies in moderate limit. Hence it is understood from the results that replacement of NA with RA is very much possible and will be ecofriendly.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001800891
|
oai_dc
|
Temperature distribution behaviors of GFRP honeycomb hollow section sandwich panels
|
Temperature distribution behaviors of GFRP honeycomb hollow section sandwich panels
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"B. Kong(Louisiana State University); C. S. Cai(Louisiana State University); F. Pan(Louisiana State University)"
] |
The fiber-reinforced polymer (FRP) composite panel, with the benefits of light weight, high strength, good corrosion resistance, and long-term durability, has been considered as one of the prosperous alternatives for structural retrofits and replacements. Although with these advantages, a further application of FRPs in bridge engineering may be restricted, and that is partly due to some unsatisfied thermal performance observed in recent studies. In this regard, Kansas Department of Transportation (DOT) conducted a field monitoring program on a bridge with glass FRP (GFRP) honeycomb hollow section sandwich panels. The temperatures of the panel surfaces and ambient air were measured from December 2002 to July 2004. In this paper, the temperature distributing behaviors of the panels are firstly demonstrated and discussed based on the field measurements. Then, a numerical modeling procedure of temperature fields is developed and verified. This model is capable of predicting the temperature distributions with the local environmental conditions and material’s thermal properties. Finally, a parametric study is employed to examine the sensitivities of several temperature influencing factors, including the hollow section configurations, environmental conditions, and material properties.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001800880
|
oai_dc
|
Quantification of nonlinear seismic response of rectangular liquid tank
|
Quantification of nonlinear seismic response of rectangular liquid tank
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Santosh Kumar Nayak(National Institute of Technology Rourkela); Kishore Chandra Biswal(National Institute of Technology Rourkela)"
] |
Seismic response of two dimensional liquid tanks is numerically simulated using fully nonlinear velocity potential theory. Galerkin-weighted-residual based finite element method is used for solving the governing Laplace equation with fully nonlinear free surface boundary conditions and also for velocity recovery. Based on mixed Eulerian-Lagrangian (MEL) method, fourth order explicit Runge-Kutta scheme is used for time integration of free surface boundary conditions. A cubic-spline fitted regridding technique is used at every time step to eliminate possible numerical instabilities on account of Lagrangian node induced mesh distortion. An artificial surface damping term is used which mimics the viscosity induced damping and brings in numerical stability. Four earthquake motions have been suitably selected to study the effect of frequency content on the dynamic response of tank-liquid system. The nonlinear seismic response vis-a-vis linear response of rectangular liquid tank has been studied. The impulsive and convective components of hydrodynamic forces, e.g., base shear, overturning base moment and pressure distribution on tank-wall are quantified. It is observed that the convective response of tank-liquid system is very much sensitive to the frequency content of the ground motion. Such sensitivity is more pronounced in shallow tanks.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001800928
|
oai_dc
|
PSO algorithm for fundamental frequency optimization of fiber metal laminated panels
|
PSO algorithm for fundamental frequency optimization of fiber metal laminated panels
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"H. Ghashochi-Bargh(Amirkabir University of Technology); M.H. Sadr(Amirkabir University of Technology)"
] |
In current study, natural frequency response of fiber metal laminated (FML) fibrous composite panels is optimized under different combination of the three classical boundary conditions using particle swarm optimization (PSO) algorithm and finite strip method (FSM). The ply angles, numbers of layers, panel length/width ratios, edge conditions and thickness of metal sheets are chosen as design variables. The formulation of the panel is based on the classical laminated plate theory (CLPT), and numerical results are obtained by the semi-analytical finite strip method. The superiority of the PSO algorithm is demonstrated by comparing with the simple genetic algorithm.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001800904
|
oai_dc
|
Rating of steel bridges considering fatigue and corrosion
|
Rating of steel bridges considering fatigue and corrosion
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"R. Lalthlamuana(Indian Institute of Technology Guwahati); S. Talukdar(Indian Institute of Technology Guwahati)"
] |
In the present work, the capacity ratings of steel truss bridges have been carried out incorporating dynamic effect of moving vehicles and its accumulating effect as fatigue. Further, corrosion in the steel members has been taken into account to examine the rating factor. Dynamic effect has been considered in the rating procedure making use of impact factors obtained from simulation studies as well as from codal guidelines. A steel truss bridge has been considered to illustrate the approach. Two levels of capacity ratings- the upper load level capacity rating (called operating rating) and the lower load level capacity rating (called inventory rating) were found out using Load and Resistance Factor Design (LRFD) method and a proposal has been made which incorporates fatigue in the rating formula. Random nature of corrosion on the steel member has been taken into account in the rating by considering reduced member strength. Partial safety factor for each truss member has been obtained from the fatigue reliability index considering random variables on the fatigue parameters, traffic growth rate and accumulated number of stress cycle using appropriate probability density function. The bridge has been modeled using Finite Element software. Regressions of rating factor versus vehicle gross weight have been obtained. Results show that rating factor decreases when the impact factor other than those in the codal provisions are considered. The consideration of fatigue and member corrosion gives a lower value of rating factor compared to those when both the effects are ignored. In addition to this, the study reveals that rating factor decreases when the vehicle gross weight is increased.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001769025
|
oai_dc
|
Impact factors of an old bridge under moving vehicular loads
|
Impact factors of an old bridge under moving vehicular loads
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Yang Liu(Changsha University of Science & Technology); Xinfeng Yin(Changsha University of Science & Technology); Jianren Zhang(Changsha University of Science & Technology); C.S. Cai(Changsha University of Science & Technology)"
] |
This paper presents a new method to study the impact factor of an old bridge based on the model updating technique. Using the genetic algorithm (GA) by minimizing an objective function of the residuals between the measured and predicted responses, the bridge and vehicle coupled vibration models were updated. Based on the displacement relationship and the interaction force relationship at the contact patches, the vehicle-bridge coupled system can be established by combining the equations of motion of both the bridge and vehicles. The simulated results show that the present method can simulate precisely the response of the tested bridge; compared with the other bridge codes, the impact factor specified by the bridge code of AASHTO (LRFD) is the most conservative one, and the value of Chinese highway bridge design code (CHBDC) is the lowest; for the large majority of old bridges whose road surface conditions have deteriorated, calculating the impact factor with the bridge codes cannot ensure the reliable results.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001769029
|
oai_dc
|
Wave propagation in a microbeam based on the modified couple stress theory
|
Wave propagation in a microbeam based on the modified couple stress theory
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Turgut Kocatürk(Yıldız Technical University); Şeref Doğuşcan Akbaş(Yıldız Technical University)"
] |
This paper presents responses of the free end of a cantilever micro beam under the effect of an impact force based on the modified couple stress theory. The beam is excited by a transverse triangular force impulse modulated by a harmonic motion. The Kelvin–Voigt model for the material of the beam is used. The considered problem is investigated within the Bernoulli-Euler beam theory by using energy based finite element method. The system of equations of motion is derived by using Lagrange’s equations. The obtained system of linear differential equations is reduced to a linear algebraic equation system and solved in the time domain by using Newmark average acceleration method. In the study, the difference of the modified couple stress theory and the classical beam theory is investigated for the wave propagation. A few of the obtained results are compared with the previously published results. The influences of the material length scale parameter on the wave propagation are investigated in detail. It is clearly seen from the results that the classical beam theory based on the modified couple stress theory must be used instead of the classical theory for small values of beam height.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001769030
|
oai_dc
|
Automated data interpretation for practical bridge identification
|
Automated data interpretation for practical bridge identification
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"J. Zhang(Southeast University); F.L. Moon(Drexel University); T. Sato(Southeast University)"
] |
Vibration-based structural identification has become an important tool for structural health monitoring and safety evaluation. However, various kinds of uncertainties (e.g., observation noise) involved in the field test data obstruct automation system identification for accurate and fast structural safety evaluation. A practical way including a data preprocessing procedure and a vector backward auto-regressive (VBAR) method has been investigated for practical bridge identification. The data preprocessing procedure serves to improve the data quality, which consists of multi-level uncertainty mitigation techniques. The VBAR method provides a determinative way to automatically distinguish structural modes from extraneous modes arising from uncertainty. Ambient test data of a cantilever beam is investigated to demonstrate how the proposed method automatically interprets vibration data for structural modal estimation. Especially, structural identification of a truss bridge using field test data is also performed to study the effectiveness of the proposed method for real bridge identification.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001769026
|
oai_dc
|
The dynamic response of a prototype steel floor using velocitysource type of excitation
|
The dynamic response of a prototype steel floor using velocitysource type of excitation
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Max D.C. Magalhaes(Federal University of Minas Gerais)"
] |
Vibration isolators and anti-vibration mounts are ideal, for example, in creating floating floors for gymnasiums, or performance spaces. However, it is well-known that there are great difficulties on isolating vibration transmission in structural steel components, especially steel floors. Besides, the selection of inertia blocks, which are usually used by engineers as an effective vibration control measure, is usually based on crude methods or the experience of the engineers. Thus, no simple method or indices have been available for assessing the effect of inertia blocks on vibration isolation or stability of vibratory systems. Thus, the aims of this research are to provide further background description using a FE model and present and implement a modal approach, that was validated experimentally, the latter assisting in providing improved understanding of the vibration transmission phenomenon in steel buildings excited by a velocitysource type of excitation. A better visualization of the mean-square velocity distribution in the frequency domain is presented using the concept of modal expansion. Finally, the variation of the mean-square velocity with frequency, whilst varying mass and/or stiffness of the coupled system, is presented.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001769027
|
oai_dc
|
Fatigue experiments on steel cold-formed panels under a dynamic load protocol
|
Fatigue experiments on steel cold-formed panels under a dynamic load protocol
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Antonio J. García-Palencia(University of New Hampshire); Luis A. Godoy(National University of Córdoba)"
] |
A dynamic load protocol has been used to experimentally simulate fatigue behavior in coldformed metal panels with screwed connections under wind loading. The specific protocol adopted is an adaptation of SIDGERS, originally developed for non-metallic membranes, which is composed of levels each under increasing load values. A total of 19 tests were performed on 3.35 m long by 0.91 m wide panels, identified as Type B-wide rib and Type E, both with screw connections at the edge and at the center, thus conforming two-span specimens. In some configurations the panels were fixed at the valleys, whereas crestfixed connections were also investigated. Reinforcing the connections by means of washers was also investigated to evaluate their efficiency in improving fatigue capacity. The experimental results show maximum load capacities in improved connections with washers of approximately twice of those with classical connections.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001769028
|
oai_dc
|
A hybrid imperialist competitive ant colony algorithm for optimum geometry design of frame structures
|
A hybrid imperialist competitive ant colony algorithm for optimum geometry design of frame structures
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mojtaba Sheikhi(Semnan University); Ali Ghoddosian(Semnan University)"
] |
This paper describes new optimization strategy that offers significant improvements in performance over existing methods for geometry design of frame structures. In this study, an imperialist competitive algorithm (ICA) and ant colony optimization (ACO) are combined to reach to an efficient algorithm, called Imperialist Competitive Ant Colony Optimization (ICACO). The ICACO applies the ICA for global optimization and the ACO for local search. The results of optimal geometry for three benchmark examples of frame structures, demonstrate the effectiveness and robustness of the new method presented in this work. The results indicate that the new technique has a powerful search strategies due to the modifications made in search module of ICACO. Higher rate of convergence is the superiority of the presented algorithm in comparison with the conventional mathematical methods and non hybrid heuristic methods such as ICA and particle swarm optimization (PSO).
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001769024
|
oai_dc
|
Seismic fragility evaluation of piping system installed in critical structures
|
Seismic fragility evaluation of piping system installed in critical structures
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"주부석(North Carolina State University); 정우영(GangNeung-WonJu National University); Yong Hee Ryu(North Carolina State University)"
] |
Seismic performance of critical facilities has been focused on the structural components over the past decade. However, most earthquake damages were observed to the nonstructural components during and after the earthquakes. The primary objective of this research was to develop the seismic fragility of the piping system incorporating the nonlinear Tee-joint finite element model in the full scale piping configuration installed in critical facilities. The procedure for evaluating fragility curves corresponding to the first damage state was considered the effects of the top floor acceleration sensitivities for 5, 10, 15, and 20 story linear RC and steel building systems subjected to 22 selected ground motions as a function of ground motion uncertainties. The result of this study revealed that the conditional probability of failure of the piping system on the top floor in critical facilities did not increase with increased level of story height and in fact, story level in buildings can tune the fragilities between the building and the piping system.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001769023
|
oai_dc
|
Study on the effect of ties in the intermediate length Cold Formed Steel (CFS) columns
|
Study on the effect of ties in the intermediate length Cold Formed Steel (CFS) columns
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"M. Anbarasu(Government College of Engineering); S. Bharath Kumar(Government College of Engineering); S. Sukumar(Government College of Engineering)"
] |
This work aims to study the effect of stiffener ties in the behavior of intermediate length open section Cold-Formed Steel (CFS) Columns under axial compression. A comparative study on the behaviour and strength of Cold Formed Steel Columns by changing the direction of projection of lips (i.e., inwards or outwards) are also done. In this work two types of sections were considered Type-I section with lip projecting outwards (hat) and Type-II section with lip projecting inwards (channel). The length of the columns is predicted by performing elastic buckling analysis using CUFSM software. The theoretical analysis is performed using DSM - S100;2007, AS/NZ: 4600-2005 and IS: 801-1975. The compression tests are carried out in a 400 kN loading frame with hinged-hinged end condition. The non-linear numerical analysis is performed using Finite Element software ANSYS 12.0 to simulate the experimental results. Extensive parametric study is carried out by varying the width and spacing of the stiffener ties. The results are compared; the effects of stiffener ties on behaviour and load carrying capacity on both types of columns are discussed.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001761974
|
oai_dc
|
Buckling and vibration of rectangular plates of variable thickness with different end conditions by finite difference technique
|
Buckling and vibration of rectangular plates of variable thickness with different end conditions by finite difference technique
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Sundaramoorthy Rajasekaran(PSG College of Technology); Antony John Wilson(Coimbatore Institute of Technology)"
] |
This paper is concerned with the determination of exact buckling loads and vibration frequencies of variable thickness isotropic plates using well known finite difference technique. The plates are subjected to uni, biaxial compression and shear loadings and various combinations of boundary conditions are considered. The buckling load is found out as the in plane load that makes the determinant of the stiffness matrix equal to zero and the natural frequencies are found out by carrying out eigenvalue analysis of stiffness and mass matrices. New and exact results are given for many cases and the results are in close agreement with the published results. In this paper, like finite element method, finite difference method is applied in a very simple manner and the application of boundary conditions is also automatic.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001761850
|
oai_dc
|
Approximate methods to evaluate storey stiffness and interstory drift of RC buildings in seismic area
|
Approximate methods to evaluate storey stiffness and interstory drift of RC buildings in seismic area
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"N. Caterino(University of Naples ‘Parthenope’); E. Cosenza(University of Naples Federico II); B.M. Azmoodeh(University of Naples ‘Parthenope’)"
] |
During preliminary design of a RC building located in a seismic area, having quick but reliable analytical measurement of interstory drifts and storey stiffnesses might be helpful in order to check the fulfillment of damage limit state and stiffness regularity in elevation required by seismic design codes. This paper presents two approximate methods, strongly interrelated each other, and addressed to achieve each of these two purposes for frame buildings. A brief description of some already existing methods addressed to the same aims is included to compare the main differences in terms of general approaches and assumptions. Both new approximate methods are then applied to 9 ‘ideal’ frames and 2 ‘real’ buildings designed according to the Italian seismic code. The results are compared with the ‘exact’ values obtained by the codebased standard calculation, performed via FEM models, showing a satisfactory range of accuracy. Compared with those by the other methods from literature, they indicate the proposed procedures lead to a better approximation of the objective structural parameters, especially for those buildings designed according to the modern ‘capacity design’ philosophy.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001761847
|
oai_dc
|
Equivalent frame model and shell element for modeling of inplane behavior of Unreinforced Brick Masonry buildings
|
Equivalent frame model and shell element for modeling of inplane behavior of Unreinforced Brick Masonry buildings
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mohammad Kheirollahi(Sahand University of Technology)"
] |
Although performance based assessment procedures are mainly developed for reinforced concrete and steel buildings, URM (Unreinforced Masonry) buildings occupy significant portion of buildings in earthquake prone areas of the world as well as in IRAN. Variability of material properties, nonengineered nature of the construction and difficulties in structural analysis of masonry walls make analysis of URM buildings challenging. Despite sophisticated finite element models satisfy the modeling requirements, extensive experimental data for definition of material behavior and high computational resources are needed. Recently, nonlinear equivalent frame models which are developed assigning lumped plastic hinges to isotropic and homogenous equivalent frame elements are used for nonlinear modeling of URM buildings. The equivalent frame models are not novel for the analysis of masonry structures, but the actual potentialities have not yet been completely studied, particularly for non-linear applications. In the present paper an effective tool for the non-linear static analysis of 2D masonry walls is presented. The work presented in this study is about performance assessment of unreinforced brick masonry buildings through nonlinear equivalent frame modeling technique. Reliability of the proposed models is tested with a reversed cyclic experiment conducted on a full scale, two-story URM building at the University of Pavia .The pushover curves were found to provide good agreement with the experimental backbone curves. Furthermore, the results of analysis show that EFM (Equivalent Frame Model) with Dolce RO (rigid offset zone) and shell element have good agreement with finite element software and experimental results.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001761849
|
oai_dc
|
An efficient method for structural damage localization based on the concepts of flexibility matrix and strain energy of a structure
|
An efficient method for structural damage localization based on the concepts of flexibility matrix and strain energy of a structure
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mehdi Nobahari(Islamic Azad University); Seyed Mohammad Seyedpoor(Shomal University)"
] |
An efficient method is proposed here to identify multiple damage cases in structural systems using the concepts of flexibility matrix and strain energy of a structure. The flexibility matrix of the structure is accurately estimated from the first few mode shapes and natural frequencies. Then, the change of strain energy of a structural element, due to damage, evaluated by the columnar coefficients of the flexibility matrix is used to construct a damage indicator. This new indicator is named here as flexibility strain energy based index (FSEBI). In order to assess the performance of the proposed method for structural damage detection, two benchmark structures having a number of damage scenarios are considered. Numerical results demonstrate that the method can accurately locate the structural damage induced. It is also revealed that the magnitudes of the FSEBI depend on the damage severity.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001761843
|
oai_dc
|
On methods for extending a single footfall trace into a continuous force curve for floor vibration serviceability analysis
|
On methods for extending a single footfall trace into a continuous force curve for floor vibration serviceability analysis
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Jun Chen(Tongji University); Yixin Peng(Tongji University); Ting Ye(Tongji University)"
] |
An experimentally measured single footfall trace (SFT) from a walking subject needs to be extended into a continuous force curve, which can then be used as load for floor vibration serviceability assessment, or on which further analysis like discrete Fourier transform can be conducted. This paper investigates the accuracy, applicability and parametrical sensitivity of four extension methods, Methods I to IV, which extends the SFT into a continuous time history by the walking step rate, stride time, double support proportion and the double support time, respectively. Performance of the four methods was assessed by comparing their results with the experimentally obtained reference footfall traces in the time and frequency domain, and by comparing the vibrational response of a concrete slab subjected to the extended traces to that of reference traces. The effect of the extension parameter on each method was also explored through parametrical analysis. This study finds that, in general, Method I and II perform better than Method III and IV, and all of the four methods are sensitive to their extension parameter. When reliable information of walking rate or gait period is available in the test, Methods I or II is a better choice. Otherwise, Method III, with the suggested extension parameter of double support time proportion, is recommended.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001761840
|
oai_dc
|
Hybrid nonlinear control of a tall tower with a pendulum absorber
|
Hybrid nonlinear control of a tall tower with a pendulum absorber
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Diego Orlando(Pontifical Catholic University of Rio de Janeiro); Paulo B. Gonçalves(Pontifical Catholic University of Rio de Janeiro)"
] |
Pendulums can be used as passive vibration control devices in several structures and machines. In the present work, the nonlinear behavior of a pendulum-tower system is studied. The tower is modeled as a bar with variable cross-section with concentrated masses. First, the vibration modes and frequencies of the tower are obtained analytically. The primary structure and absorber together constitute a coupled system which is discretized as a two degrees of freedom nonlinear system, using the normalized eigenfunctions and the Rayleigh-Ritz method. The analysis shows the influence of the geometric nonlinearity of the pendulum absorber on the response of the tower. A parametric analysis also shows that, with an appropriate choice of the absorber parameters, a pendulum can decrease the vibration amplitudes of the tower in the main resonance region. The results also show that the pendulum nonlinearity cannot be neglected in this type of problem, leading to multiplicity of solutions, dynamic jumps and instability. In order to improve the effectiveness of the control during the transient response, a hybrid control system is suggested. The added control force is implemented as a non-linear variable stiffness device based on position and velocity feedback. The obtained results show that this strategy of nonlinear control is attractive, has a good potential and can be used to minimize the response of slender structures under various types of excitation.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001761975
|
oai_dc
|
Stress-strain relationships for steel fiber reinforced selfcompacting concrete
|
Stress-strain relationships for steel fiber reinforced selfcompacting concrete
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Farhad Aslani(University of Technology Sydney); Mehrnaz Natoori(University of Technology Sydney)"
] |
Steel fiber reinforced self-compacting concrete (SFRSCC) is a relatively new composite material which congregates the benefits of self-compacting concrete (SCC) technology with the profits derived from the fiber addition to a brittle cementitious matrix. Steel fibers improve many of the properties of SCC elements including tensile strength, toughness, energy absorption capacity and fracture toughness. Modification in the mix design of SCC may have a significant influence on the SFRSCC mechanical properties. Therefore, it is vital to investigate whether all of the assumed hypotheses for steel fiber reinforced concrete (SFRC) are also valid for SFRSCC structures. Although available research regarding the influence of steel fibers on the properties of SFRSCC is limited, this paper investigates material’s mechanical properties. The present study includes: a) evaluation and comparison of the current analytical models used for estimating the mechanical properties of SFRSCC and SFRC, b) proposing new relationships for SFRSCC mixtures mechanical properties. The investigated mechanical properties are based on the available experimental results and include: compressive strength, modulus of elasticity, strain at peak compressive strength, tensile strength, and compressive and tensile stress-strain curves.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001761846
|
oai_dc
|
Numerical simulation on fluid-structure interaction of wind around super-tall building at high reynolds number conditions
|
Numerical simulation on fluid-structure interaction of wind around super-tall building at high reynolds number conditions
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Shenghong Huang(University of Science and Technology of China); Rong Li(University of Science and Technology of China); Q.S Li(City University of Hong Kong)"
] |
With more and more high-rise building being constructed in recent decades, bluff body flow with high Reynolds number and large scale dimensions has become an important topic in theoretical researches and engineering applications. In view of mechanics, the key problems in such flow are high Reynolds number turbulence and fluid-solid interaction. Aiming at such problems, a parallel fluid-structure interaction method based on socket parallel architecture was established and combined with the methods and models of large eddy simulation developed by authors recently. The new method is validated by the full two-way FSI simulations of 1:375 CAARC building model with Re = 70000 and a full scale Taipei101 high-rise building with Re = 1e8, The results obtained show that the proposed method and models is potential to perform high-Reynolds number LES and high-efficiency two-way coupling between detailed fluid dynamics computing and solid structure dynamics computing so that the detailed wind induced responses for high-rise buildings can be resolved practically.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001751775
|
oai_dc
|
A parametric study of optimum tall piers for railway bridge viaducts
|
A parametric study of optimum tall piers for railway bridge viaducts
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Francisco J. Martínez-Martín(Universitat Politècnica de València); Fernando González-Vidosa(Universitat Politècnica de València); Antonio Hospitaler(Universitat Politècnica de València); Víctor Yepes(Universitat Politècnica de València)"
] |
This paper presents a parametric study of reinforced concrete bridge tall piers with hollow, rectangular sections. Such piers are typically used in railway construction of prestressed concrete viaducts. Twenty one different piers have been studied with seven column heights of 40, 50, 60, 70, 80, 90 and 100 m and three types of 10-span continuous viaducts, whose main span lengths are 40, 50 and 60 m. The piers studied are intermediate columns placed in the middle of the viaducts. The total number of optimization design variables varies from 139 for piers with column height of 40 m to 307 for piers with column height of 100 m. Further, the results presented are of much value for the preliminary design of the piers of prestressed concrete viaducts of high speed railway lines.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001751779
|
oai_dc
|
Numerical analyses for the structural assessment of steel buildings under explosions
|
Numerical analyses for the structural assessment of steel buildings under explosions
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Pierluigi Olmati(Sapienza University of Rome); Francesco Petrini(Sapienza University of Rome); Franco Bontempi(Sapienza University of Rome)"
] |
This paper addresses two main issues relevant to the structural assessment of buildings subjected to explosions. The first issue regards the robustness evaluation of steel frame structures: a procedure is provided for computing “robustness curves” and it is applied to a 20-storey steel frame building, describing the residual strength of the (blast) damaged structure under different local damage levels. The second issue regards the precise evaluation of blast pressures acting on structural elements using Computational Fluid Dynamic (CFD) techniques. This last aspect is treated with particular reference to gas explosions, focusing on some critical parameters (room congestion, failure of non-structural walls and ignition point location) which influence the development of the explosion. From the analyses, it can be deduced that, at least for the examined cases, the obtained robustness curves provide a suitable tool that can be used for risk management and assessment purposes. Moreover, the variation of relevant CFD analysis outcomes (e.g., pressure) due to the variation of the analysis parameters is found to be significant.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001751781
|
oai_dc
|
Prediction of compressive strength of concrete using multiple regression model
|
Prediction of compressive strength of concrete using multiple regression model
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"H.S. Chore(Datta Meghe College of Engineering); N.L. Shelke(Datta Meghe College of Engineering)"
] |
In construction industry, strength is a primary criterion in selecting a concrete for a particular application. The concrete used for construction gains strength over a long period of time after pouring the concrete. The characteristic strength of concrete is defined as the compressive strength of a sample that has been aged for 28 days. Neither waiting for 28 days for such a test would serve the rapidity of construction, nor would neglecting it serve the quality control process on concrete in large construction sites. Therefore, rapid and reliable prediction of the strength of concrete would be of great significance. On this backdrop, the method is proposed to establish a predictive relationship between properties and proportions of ingredients of concrete, compaction factor, weight of concrete cubes and strength of concrete whereby the strength of concrete can be predicted at early age. Multiple regression analysis was carried out for predicting the compressive strength of concrete containing Portland Pozolana cement using statistical analysis for the concrete data obtained from the experimental work done in this study. The multiple linear regression models yielded fairly good correlation coefficient for the prediction of compressive strength for 7, 28 and 40 days curing. The results indicate that the proposed regression models are effectively capable of evaluating the compressive strength of the concrete containing Portaland Pozolana Cement. The derived formulas are very simple, straightforward and provide an effective analysis tool accessible to practicing engineers.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001751782
|
oai_dc
|
Deflection prediction of inflatable flat panels under arbitrary conditions
|
Deflection prediction of inflatable flat panels under arbitrary conditions
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"S.R. Mohebpour(Persian Gulf University)"
] |
Inflatable panels made of modern and new textile materials can be inflated at high pressure to have a high mechanical strength. This paper is based on the finite element method as a general solution to determine the characteristics of deformed inflatable panels at high pressure in various end and loading conditions. Proposed method is based on the construction of weak form of formulation and application of Reduced Integration Element method (RIE) to solve the numerical problem of shear locking. The numerical results are validated as an outcome of comparison with other published results.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001751780
|
oai_dc
|
An improvement to seismic design of substation support structures
|
An improvement to seismic design of substation support structures
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Reza Karami Mohammadi(K. N. Toosi University of Technology); Vahid Akrami(Amirkabir University of Technology); Farzad Nikfar(McMaster University)"
] |
The acceleration that the electrical equipment experiences on a structure can be several times the ground acceleration. Currently, substation support structures are being designed according to ASCE (Substation Structure Design Guide 2008), without any consideration about effects of these structures on dynamic behavior of mounted equipment. In this paper, a parametric study is implemented in order to improve seismic design of candlestick substation structures based on this design guide. To do this, dynamic amplification factor (DAF) of different candlestick support-equipment combinations is evaluated and compared to the target DAF presented in IEEE STD 693 (2006). Based on this procedure, a new criterion is developed to restrict maximum acceleration at support-equipment intersection.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001751776
|
oai_dc
|
Inelastic displacement ratios for evaluation of stiffness degrading structures with soil structure interaction built on soft soil sites
|
Inelastic displacement ratios for evaluation of stiffness degrading structures with soil structure interaction built on soft soil sites
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Müberra Eser Aydemir(Istanbul Aydin University)"
] |
In this study, inelastic displacement ratios are investigated for existing systems with known lateral strength considering soil structure interaction. For this purpose, SDOF systems for period range of 0.1-3.0 s with different hysteretic behaviors are considered for a number of 18 earthquake motions recorded on soft soil. The effect of stiffness degradation on inelastic displacement ratios is investigated. The Modified Clough model is used to represent structures that exhibit significant stiffness degradation when subjected to reverse cyclic loading and the elastoplastic model is used to represent non-degrading structures. Soil structure interaction analyses are conducted by means of equivalent fixed base model effective period,effective damping and effective ductility values differing from fixed-base case. For inelastic time history analyses, Newmark method for step by step time integration was adapted in an in-house computer program. A new equation is proposed for inelastic displacement ratio of system with SSI with elastoplastic or degrading behavior as a function of structural period (T̃), strength reduction factor (R) and period lengthening ratio (T̃/T). The proposed equation for C̃R which takes the soil-structure interaction into account should be useful in estimating the inelastic deformation of existing structures with known lateral strength.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001751777
|
oai_dc
|
A topology optimization method for multiple load cases and constraints based on element independent nodal density
|
A topology optimization method for multiple load cases and constraints based on element independent nodal density
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Jijun Yi(Central South University); Jianhua Rong(Changsha University of Science and Technology); Tao Zeng(Central South University); X. Huang(RMIT University)"
] |
In this paper, a topology optimization method based on the element independent nodal density (EIND) is developed for continuum solids with multiple load cases and multiple constraints. The optimization problem is formulated as minimizing the volume subject to displacement constraints. Nodal densities of the finite element mesh are used as the design variables. The nodal densities are interpolated into any point in the design domain by the Shepard interpolation scheme and the Heaviside function. Without using additional constraints (such as the filtering technique), mesh-independent, checkerboard-free, distinct optimal topology can be obtained. Adopting the rational approximation for material properties (RAMP), the topology optimization procedure is implemented using a solid isotropic material with penalization (SIMP) method and a dual programming optimization algorithm. The computational efficiency is greatly improved by multithread parallel computing with OpenMP to run parallel programs for the shared-memory model of parallel computation. Finally, several examples are presented to demonstrate the effectiveness of the developed techniques.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001751778
|
oai_dc
|
Adaptive Neuro Fuzzy Inference System (ANFIS) and Artificial Neural Networks (ANNs) for structural damage identification
|
Adaptive Neuro Fuzzy Inference System (ANFIS) and Artificial Neural Networks (ANNs) for structural damage identification
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"S.J.S. Hakim(University of Malaya); H. Abdul Razak(University of Malaya)"
] |
In this paper, adaptive neuro-fuzzy inference system (ANFIS) and artificial neural networks (ANNs) techniques are developed and applied to identify damage in a model steel girder bridge using dynamic parameters. The required data in the form of natural frequencies are obtained from experimental modal analysis. A comparative study is made using the ANNs and ANFIS techniques and results showed that both ANFIS and ANN present good predictions. However the proposed ANFIS architecture using hybrid learning algorithm was found to perform better than the multilayer feedforward ANN which learns using the backpropagation algorithm. This paper also highlights the concept of ANNs and ANFIS followed by the detail presentation of the experimental modal analysis for natural frequencies extraction.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001793320
|
oai_dc
|
An improved particle swarm optimizer for steel grillage systems
|
An improved particle swarm optimizer for steel grillage systems
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ferhat Erdal(Akdeniz University); Erkan Doğan(Celal Bayar University); Mehmet Polat Saka(University of Bahrain)"
] |
In this paper, an improved version of particle swarm optimization based optimum design algorithm (IPSO) is presented for the steel grillage systems. The optimum design problem is formulated considering the provisions of American Institute of Steel Construction concerning Load and Resistance Factor Design. The optimum design algorithm selects the appropriate W-sections for the beams of the grillage system such that the design constraints are satisfied and the grillage weight is the minimum. When an improved version of the technique is extended to be implemented, the related results and convergence performance prove to be better than the simple particle swarm optimization algorithm and some other metaheuristic optimization techniques. The efficiency of different inertia weight parameters of the proposed algorithm is also numerically investigated considering a number of numerical grillage system examples.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001793324
|
oai_dc
|
Investigation of shear transfer mechanisms in repaired damaged concrete columns strengthened with RC jackets
|
Investigation of shear transfer mechanisms in repaired damaged concrete columns strengthened with RC jackets
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Achillopoulou V. Dimitra(Democritus University of Thrace); Karabinis I. Athanasios(Democritus University of Thrace)"
] |
The study presents the results of an experimental program concerning the shear force transfer between reinforced concrete (RC) jackets and existing columns with damages. In order to investigate the effectiveness of the repair method applied and the contribution of each shear transfer mechanism of the interface. It includes 22 concrete columns (core) (of 24,37MPa concrete strength) with square section (150mm side, 500 mm height and scale 1:2). Ten columns had initial construction damages and twelve were subjected to initial axial load. Sixteen columns have full jacketing at all four faces with 80mm thickness (of 31,7MPa concrete strength) and contain longitudinal bars (of 500MPa nominal strength) and closed stirrups spaced at 25mm, 50mm or 100mm (of 220MPa nominal strength). Fourteen of them contain dowels at the interface between old and new concrete. All columns were subjected to repeated (pseudo-seismic) axial compression with increasing deformation cycles up to failure with or without jacketing. Two load patterns were selected to examine the difference of the behavior of columns. The effects of the initial damages, of the reinforcement of the interface (dowels) and of the confinement generated by the stirrups are investigated through axial- deformation (slip) diagrams and the energy absorbed diagrams. The results indicate that the initial damages affect the total behavior of the column and the capacity of the interface to shear mechanisms and to slip: a) the maximum bearing load of old column is decreased affecting at the same time the loading capacity of the jacketed element, b) suitable repair of initially damaged specimens increases the capacity of the jacketed column to transfer load through the interface.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001793319
|
oai_dc
|
Structural optimization with teaching-learning-based optimization algorithm
|
Structural optimization with teaching-learning-based optimization algorithm
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Tayfun Dede(Karadeniz Technical University); Yusuf Ayvaz(Yildiz Technical University)"
] |
In this paper, a new efficient optimization algorithm called Teaching–Learning-Based Optimization (TLBO) is used for the least weight design of trusses with continuous design variables. The TLBO algorithm is based on the effect of the influence of a teacher on the output of learners in a class. Several truss structures are analyzed to show the efficiency of the TLBO algorithm and the results are compared with those reported in the literature. It is concluded that the TLBO algorithm presented in this study can be effectively used in the weight minimization of truss structures.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001793318
|
oai_dc
|
Development of an integrated approach for Algerian building seismic damage assessment
|
Development of an integrated approach for Algerian building seismic damage assessment
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mehdi Boukri(Saad Dahlab University); Mohammed Naboussi Farsi(National Earthquake Engineering Research Centre); Ahmed Mébarki(Université Paris-Est); Mohamed Belazougui(National Earthquake Engineering Research Centre)"
] |
This paper presents a framework for seismic damage evaluation for Algerian buildings adapted from HAZUS approach (Hazard-United States). Capacity and fragility curves were adapted to fit the Algerian building typologies (Reinforced Concrete structures, Confined or Non-Confined Masonry, etc). For prediction purposes, it aims to estimate the damages and potential losses that may be generated by a given earthquake in a prone area or country. Its efficiency is validated by comparing the estimated and observed damages in Boumerdès city, in the aftermath of Boumerdès earthquake (Algeria: May 21st 2003; Mw = 6.8). For this purpose, observed damages reported for almost 3,700 buildings are compared to the theoretical predictions obtained under two distinct modelling of the seismic hazard. In one hand, the site response spectrum is built according to real accelerometric records obtained during the main shock. In the other hand, the effective Algerian seismic code response spectrum (RPA 99) in use by the time of the earthquake is considered; it required the prior fitting of Boumerdès site PGA (Peak Ground Acceleration) provided by Ambraseys’ attenuation relationship.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001793317
|
oai_dc
|
Dynamic analysis of a beam subjected to an eccentric rolling disk
|
Dynamic analysis of a beam subjected to an eccentric rolling disk
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Jia-Jang Wu(National Kaohsiung Marine University)"
] |
This paper presents a theory concerning the beam element subjected to an eccentric rolling disk (or simply called the eccentric-disk-loaded beam element) such that the dynamic responses of a beam subjected to an eccentric rolling disk with its inertia force, Coriolis force and centrifugal force considered can be easily determined. To this end, the property matrices of an eccentric-disk-loaded beam element are firstly derived by means of the Lagrange’s equations. Then, the overall property matrices of the entire vibrating system are determined by directly adding the property matrices of the eccentric-disk-loaded beam element to the overall ones of the entire beam itself. Finally, the Newmark direct integration method is used to solve the equations of motion for the dynamic responses of a beam subjected to an eccentric rolling disk. Some factors relating to the title problem, such as the eccentricity, radius and rotating speed of the rolling disk, and the Coriolis force and centrifugal force induced by the rolling disk are investigated. Numerical results reveal that the influence of last factors on the dynamic responses of the pinned-pinned beam is significant except the centrifugal force.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001793321
|
oai_dc
|
Effects of traffic characteristics on pavement responses at the road intersection
|
Effects of traffic characteristics on pavement responses at the road intersection
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Qun Yang(Tongji University); Jingwang Dai(Tongji University)"
] |
Compared with pavement structures of ordinary road sections, pavement structures in the intersection are exposed to more complex traffic characteristics which may exacerbates pavement distresses such as fatigue-cracking, shoving, shear deformation and rutting. Based on a field survey about traffic characteristics in the intersection conducted in Shanghai China, a three dimensional dynamic finite-element model was developed for evaluating the mechanistic responses in the pavement structures under different traffic characteristics, namely uniform speed, acceleration and deceleration. The results from this study indicated that：(1) traffic characteristics have significant effects on the distributions of the maximum principal strain (MPS) and the maximum shear stress (MSS) at the pavement surface; (2) vehicle acceleration or deceleration substantially impact the MPS and MSS at pavement surface and could increase the magnitude of them by 20 percent to 260 percent; (3) in the vertical direction, with the increase of vehicle deceleration rate, the location of the MPS peak value and the MSS peak value changes from the sub-surface layer to the pavement surface.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001793323
|
oai_dc
|
Axisymmetric large deflection analysis of fully and partially loaded shallow spherical shells
|
Axisymmetric large deflection analysis of fully and partially loaded shallow spherical shells
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Murat Altekin(Yildiz Technical University); Receb F. Yükseler(Yildiz Technical University)"
] |
Geometrically non-linear axisymmetric bending of a shallow spherical shell with a clamped or a simply supported edge under axisymmetric load was investigated numerically. The partial load was introduced by the Heaviside step function, and the solution was obtained by the finite difference and the Newton-Raphson methods. The thickness of the shell was considered to be uniform and the material was assumed to be homogeneous and isotropic. Sensitivity analysis was made for three geometrical parameters.
The accuracy of the algorithm was checked by comparing the central deflection, the radial membrane stress at the edge, or the transverse shear force with the solutions of plates and shells in the literature and good agreement was obtained. The main findings of the study can be outlined as follows: (i) If the shell is fully loaded the central deflection of a clamped shell is larger than that of a simply supported shell provided that the shell is not very shallow, (ii) if the shell is partially loaded the central deflection of the shell is sensitive to the parameters of thickness, depth, and partial loading but the influence of the boundary conditions is negligible.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001793322
|
oai_dc
|
Experimental investigation on the use of recycled aggregates in producing concrete
|
Experimental investigation on the use of recycled aggregates in producing concrete
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Attaullah Shah(Allama Iqbal Open University); Irfan U. Jan(University of Peshawar); Raza U. Khan(National Agriculture Research Centre); Ehsan U. Qazi(National Institute of Science and Technical Education)"
] |
Disposal of construction wastes poses major challenge to the municipal administration in the developing countries. At the same time new developments in these countries are unscrupulously exploiting the natural resources. The sustainable development requires judicious and careful utilization of natural resources. In this context, reuse of construction and demolition waste can save the global natural resources to greater extent. In this work the bricks and concrete waste from construction sites were crushed to the desired sizes and mixed in various proportions to study its properties in the concrete both in fresh and hardened states. Six mixes of natural and recycled aggregates were used to make the coarse aggregates for the concrete. From each mix nine cylinders were cast, which were tested at 7,14 and 28 days. The properties of concrete with recycled aggregates were compared with the control mix having natural aggregates. The nominal ratio of cement sand and coarse aggregates were kept at 1:2:4 by weight for all mixes. The tests have shown that concrete with recycled aggregates made from old concrete and brick bats provide greater opportunities for reuse of construction wastes in concrete.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART000911919
|
oai_dc
|
Behaviour of volcanic pumice based thin walled composite filled columns under eccentric loading
|
Behaviour of volcanic pumice based thin walled composite filled columns under eccentric loading
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"KhandarkerM.AnwarHossain(Ryerson University)"
] |
This paper describes experimental and theoretical investigations on the behaviour of thinwalled composite (TWC) filled columns under eccentric loading conditions. Details of the experimentalinvestigation including description of the test columns, testing arrangements, failure modes, straincharacteristics, load-deformation responses and effects of various geometric and material parameters arepresented. The current paper also introduces the use and effect of lightweight Volcanic Pumice Concrete(VPC) in TWC columns. Analytical models for the design of columns under eccentric loading conditionshave been developed taking into consideration the effect of confined concrete. The performance of designequations is validated through experimental results. The proposed design models are found to producebetter results compared with available design procedures and Code based formulations. A computerprogram is developed to generate the interaction diagrams based on the proposed design equations thatcan be used for design purposes.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001197888
|
oai_dc
|
Damage assessment in periodic structures from measured natural frequencies by a sensitivity and transter matrix-based method
|
Damage assessment in periodic structures from measured natural frequencies by a sensitivity and transter matrix-based method
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"HongpingZhu(Huazhoung University); LinLi(Huazhoung University); DanshengWang(Huazhoung University)"
] |
This paper presents a damage assessment procedure applied to periodic spring mas systemsusing an eigenvalue sensitivity-based method. The damage is directly related to the stiffness reduction ofthe damage element. The natural frequencies of periodic structures with one single disorder are found byadopting the transfer matrix approach, consequently, the first order approximation of the naturalfrequencies with respect to the disordered stiffness in different elements is used to form the sensitivitymatrix. The analysis shows that the sensitivity of natural frequencies to damage in diferent locationsdepends only on the mode number and the location of damage. The stiffness changes due to damage canbe identified by solving a set of underdetermined equations based on the sensitivity matrix. The issuesassociated with many possible damage locations in large structural systems are addressed, and a means ofimproving the computational efficiency of damage detection while maintaining the accuracy for largeperiodic structures with limited available measured natural frequencies, is also introduced in this paper.The incomplete measurements and the effect of random eror in terms of measurement noise in thenatural frequencies are considered. Numerical results of a periodic spring-mass system of 20 degrees offredom illustrate that the proposed method is simple and robust in locating single or multiple damages ina large periodic structure with a high computational efficiency.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART000911918
|
oai_dc
|
Preliminary design of cable-stayed bridges for vertical static loads
|
Preliminary design of cable-stayed bridges for vertical static loads
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"G.T.Michaltsos(National Technical University of Athens); J.C.Ermopoulos(National Technical University of Athens); T.G.Konstantakopoulos(National Technical University of Athens)"
] |
This paper proposes a new method for the preliminary design of cable-stayed bridges thatbelong to the radial system subjected to static loads (self weight, traffic loads, concentrated loads, etc).The method is based on the determination of the each time existing relation between the tension forces ofthe cables and the corresponding bridge-deck deformations, and can be extended on any type of cablelayout (fan, parallel, or mixed system). Galerkins method is used for the final determination of the cablestreses and the bridge deformation. The determination of the equation, which gives the forces of thecables in relation to the decks configurations, permits us to convert the problem to the solving of acontinuous beam without cables.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART000911987
|
oai_dc
|
Structure's base design for earthequake protection numerical and experimental study
|
Structure's base design for earthequake protection numerical and experimental study
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"K.Alsaif(King Saud University); H.Kaplan(University of Wisconsin-Madison)"
] |
A base isolation system is proposed for earthquake protection of structures. The systemincorporates spherical supports for the base, a specially designed spring-cam system to keep the baserigidly supported under normal condition and to allow it to move for the duration of the earthquake underthe constraint of a spring with optimized non-linear characteristics. A single-story model is constructed toinvestigate the feasibility of the concept. Numerical simulations of the system as well as experimentalresults show that 95% reduction of the transmitted force to the structure can be achieved. To demonstratethe effectiveness of this isolation mechanism, the maximum dynamic bending stress developed at pre-determined critical points within the frame of the structure is measured. Significant reduction of thedynamic stresses is obtained.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001197890
|
oai_dc
|
Optimal response of conical tool semi angle in ductile metal sheets indentation and its governing mechanics
|
Optimal response of conical tool semi angle in ductile metal sheets indentation and its governing mechanics
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"MalikM.Nazzer(Dr.A.Q.Khan research Laboratories); M.AfzalKhan(Dr.A.Q.Khan research Laboratories); A-ulHaq(Dr.A.Q.Khan research Laboratories)"
] |
The nonlinear dependence aspect of various conical tool indentation parameters leading to anoptimum tool semi angle value for easiest perforation is plotted and discussed explicitly in this work withthe conclusion that tool angle has an optimum response towards most of the indentation parameters.Around this optimum angle, the aluminium sheets showed minimum fracture toughness as well asminimum work input to overcome the offered resistance. At the end, the mechanism leading to thisphenomenon is presented with the conclusion that plastic flow dominates as the dimple semi cone anglereaches 35and both pre and post plastic flow perforations lead the tool semi cone angle value towardsthis dimple cone semi angle of plastic flow initiation for its optimum performance. It is also concludedthat specimen material failure is solely under tensile hop stress and hence results into radial cracksinitiation and propagation.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART000911920
|
oai_dc
|
Prediction of concrete strength using serial functional network model
|
Prediction of concrete strength using serial functional network model
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"S.Rajasekaran(PSG College of Technology); Seung-ChangLee(Research and Development Center)"
] |
The aim of this paper is to develop the ISCOSTFUN (Intelligent System for Prediction ofConcrete Strength by Functional Networks) in order to provide in-place strength information of theconcrete to facilitate concrete from removal and scheduling for construction. For this purpose, the systemis developed using Functional Network (FN) by learning functions instead of weights as in ArtificialNeural Networks (AN). In serial functional network, the functions are trained from enough input-outputdata and the input for one functional network is the output of the other functional network. UsingISCOSTFUN it is possible to predict early strength as well as 7-day and 28-day strength of concrete.Altogether seven functional networks are used for prediction of strength development. This study showsthat ISCOSTFUN using functional network is very efficient for predicting the compresive strengthdevelopment of concrete and it takes less computer time as compared to well known Back PropagationNeural Network (BPN).
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001197889
|
oai_dc
|
Eigenfunction expansion solution and finite element solution for orthotropic hollow cylinder under sinusoidal impact load
|
Eigenfunction expansion solution and finite element solution for orthotropic hollow cylinder under sinusoidal impact load
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"X.Wang(Shanghai Jiaotong University); H.L.Dai(Shanghai Jiaotong University)"
] |
The histories and distributions of dynamic streses in an orthotropic hollow cylinder undersinusoidal impact load are obtained by making use of eigenfunction expansion method in this paper.Dynamic equations for axially symetric orthotropic problem are founded and results are carried out for apractical example in which an orthotropic hollow cylinder is in initially at rest and subjected to a dynamicinterior pressure p(t)= -s0(sinat+1). The features of the solution appear the propagation of thecylindrical waves. The other hand, a dynamic finite element solution for the same problem is also got bymaking use of structural software (ABAQUS) program. Comparing theoretical solution with finite elementsolution, it can be found that two kinds of results obtained by two diferent solving methods are suitablyapproached. Thus, it is further concluded that the method and computing process of the theoreticalsolution are effective and accurate.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001776193
|
oai_dc
|
Identification of a suitable ANN architecture in predicting strain in tie section of concrete deep beams
|
Identification of a suitable ANN architecture in predicting strain in tie section of concrete deep beams
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mohammad Mohammadhassani(University of Malaya); Hossein Nezamabadi-pour(Shahid Bahonar University of Kerman); Meldi Suhatril(University of Malaya); Mahdi Shariati(University of Malaya)"
] |
The comparison of the effectiveness of artificial neural network (ANN) and linear regression (LR) in the prediction of strain in tie section using experimental data from eight high-strength-self-compactconcrete (HSSCC) deep beams are presented here. Prior to the aforementioned, a suitable ANN architecture was identified. The format of the network architecture was ten input parameters, two hidden layers, and one output. The feed forward back propagation neural network of eleven and ten neurons in first and second TRAINLM training function was highly accurate and generated more precise tie strain diagrams compared to classical LR. The ANN’s MSE values are 90 times smaller than the LR’s. The correlation coefficient value from ANN is 0.9995 which is indicative of a high level of confidence.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001776198
|
oai_dc
|
Experimental investigation of the large amplitude vibrations of a thin-walled column under self-weight
|
Experimental investigation of the large amplitude vibrations of a thin-walled column under self-weight
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Paulo B. Gonçalves(Catholic University); Daniel Leonardo B.R. Jurjo(Federal University of Rio de Janeiro); Carlos Magluta(Federal University of Rio de Janeiro); Ney Roitman(Federal University of Rio de Janeiro)"
] |
This work presents an experimental methodology specially developed for the nonlinear largeamplitude free vibration analysis of a clamped-free thin-walled metal column under self-weight. The main contribution of this paper is related to the developed experimental methodology which is based on a remote sensing technique using a computer vision system that integrates, on-line, the digital image acquisition and its treatment through special image processing routines. The main importance of this methodology is that it performs large deflections measurements without making contact with the structure and thus, not introducing undesirable changes in its behavior, for instance, appreciable changes in mass and stiffness properties. This structure presents, in most cases, highly non-linear responses, which cannot be reproduced by conventional finite-element softwares due, mainly, to the simultaneous influence of geometric and inertial non-linearities. To capture the non-linearities associated with large amplitude vibration and be able to describe the buckling process, the structure is discretized as a sequence of jointed coupled elastic pendulums. The obtained numerical results are favorably compared with the experimental ones, in the preand post-buckling regimes.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001776190
|
oai_dc
|
The effect of bolt tightening methods and sequence on the performance of gasketed bolted flange joint assembly
|
The effect of bolt tightening methods and sequence on the performance of gasketed bolted flange joint assembly
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Muhammad Abid(Ghulam Ishaq Khan Institute of Engineering Sciences and Technology); Yasir Mehmood Khan(Ghulam Ishaq Khan Institute of Engineering Sciences and Technology)"
] |
This paper presents results of the effect of different bolt tightening sequences and methods on the performance of gasketed bolted flange joint using nonlinear finite element analysis. Bolt preload scatter due to elastic interactions, flange stress variation and bolt bending due to flange rotation and gasket contact stress variation is difficult to eliminate in torque control method i.e. tightening one bolt at a time. Although stretch control method (tightening more than one bolt at time) eradicates the bolt preload scatter, flange stress variation is relatively high. Flange joint’s performance is compared to establish relative merits and demerits of both the methods and different bolt tightening sequences.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001776174
|
oai_dc
|
Response transformation factors for deterministic-based and reliability-based seismic design
|
Response transformation factors for deterministic-based and reliability-based seismic design
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Edén Bojórquez(Universidad Autónoma de Sinaloa); Juan Bojórquez(Universidad Nacional Autónoma de México); Sonia E. Ruiz(Universidad Nacional Autónoma de México); Alfredo Reyes-Salazar(Universidad Autónoma de Sinaloa); Juan Velázquez-Dimas(Universidad Autónoma de Sinaloa)"
] |
One of the main requirements of the seismic design codes must be its easy application by structural engineers. The use of practically-applicable models or simplified models as single-degree-offreedom (SDOF) systems is a good alternative to achieve this condition. In this study, deterministic and probabilistic response transformation factors are obtained to evaluate the response in terms of maximum ductility and maximum interstory drifts of multi-degree-of-freedom (MDOF) systems based on the response of equivalent SDOF systems. For this aim, five steel frames designed with the Mexican City Building Code (MCBC) as well as their corresponding equivalent SDOF systems (which represent the characteristics of the frames) are analyzed. Both structural systems are subjected to ground motions records. For the MDOF and the simplified systems, incremental dynamic analyses IDAs are developed in first place, then, structural demand hazard curves are obtained. The ratio between the IDAs curves corresponding to the MDOF systems and the curves corresponding to the simplified models are used to obtain deterministic response transformation factors. On the other hand, demand hazard curves are used to calculate probabilistic response transformation factors. It was found that both approaches give place to similar results.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001776184
|
oai_dc
|
Study of exterior beam-column joint with different joint core and anchorage details under reversal loading
|
Study of exterior beam-column joint with different joint core and anchorage details under reversal loading
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"S. Rajagopal(Mepco Schlenk Engineering College); S. Prabavathy(Mepco Schlenk Engineering College)"
] |
In the present study, in reinforced concrete structures, beam-column connections are one of the most critical regions in areas with seismic susceptibility. Proper anchorage of reinforcement is vital to enhance the performance of beam-column joints. Congestion of reinforcement and construction difficulties are reported frequently while using conventional reinforcement detailing in beam-column joints of reinforced concrete structures. An effort has been made to study and evaluate the performance of beamcolumn joints with joint detailing as per ACI-352 (mechanical anchorage), ACI-318 (conventional hooks bent) and IS-456(full anchorage conventional hooks bent) along with confinement as per IS-13920 and without confinement. Apart from finding solutions for these problems, significant improvements in seismic performance, ductility and strength were observed while using mechanical anchorage in combination with X-cross bars for less seismic prone areas and X-cross bar plus hair clip joint reinforcement for higher seismic prone areas. To evaluate the performances of these types of anchorages and joint details, the specimens were assembled into four groups, each group having three specimens have been tested under reversal loading and the results are presented in this paper.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001776187
|
oai_dc
|
Wave propagation in a generalized thermo elastic circular plate immersed in fluid
|
Wave propagation in a generalized thermo elastic circular plate immersed in fluid
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"R. Selvamani(Karunya University); P. Ponnusamy(Government Arts College (Autonomous))"
] |
In this paper, the wave propagation in generalized thermo elastic plate immersed in fluid is studied based on the Lord-Shulman (LS) and Green-Lindsay (GL) generalized two dimensional theory of thermo elasticity. Two displacement potential functions are introduced to uncouple the equations of motion. The frequency equations that include the interaction between the plate and fluid are obtained by the perfectslip boundary conditions using the Bessel function solutions. The numerical calculations are carried out for the material Zinc and the computed non-dimensional frequency, phase velocity and attenuation coefficient are plotted as the dispersion curves for the plate with thermally insulated and isothermal boundaries. The wave characteristics are found to be more stable and realistic in the presence of thermal relaxation times and the fluid interaction.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001776182
|
oai_dc
|
Assessment of seismic fragility curves for existing RC buildings in Algiers after the 2003 Boumerdes earthquake
|
Assessment of seismic fragility curves for existing RC buildings in Algiers after the 2003 Boumerdes earthquake
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Youcef Mehani(National Earthquake Engineering Center); Hakim Bechtoula(National Earthquake Engineering Center); Abderrahmane Kibboua(National Earthquake Engineering Center); Mounir Naili(National Earthquake Engineering Center)"
] |
The main purpose of this paper is to develop seismic fragility curves for existing reinforced concrete, RC, buildings based on the post earthquake field survey and the seismic performance using capacity design. Existing RC buildings constitute approximately 65% of the total stock in Algiers. This type of buildings, RC, was widely used in the past and chosen as the structural type for the future construction program of more than 2 millions apartments all over Algeria. These buildings, suffered moderate to extensive damage after the 2003 Boumerdes earthquake, on May 21st. The determination of analytical seismic fragility curves for low-rise and mid-rise existing RC buildings was carried out based on the consistent and complete post earthquake survey after that event. The information on the damaged existing RC buildings was investigated and evaluated by experts. Thirty four (34) communes (districts) of fifty seven (57), the most populated and affected by earthquake damage were considered in this study. Utilizing the field observed damage data and the Japanese Seismic Index Methodology, based on the capacity design method. Seismic fragility curves were developed for those buildings with a large number data in order to get a statistically significant sample size. According to the construction period and the code design, four types of existing RC buildings were considered. Buildings designed with pre-code (very poor structural behavior before 1955), Buildings designed with low code (poor structural behavior, between 1955-1981), buildings designed with medium code (moderate structural behavior, between 1981-1999) and buildings designed with high code (good structural behavior, after 1999).
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001776180
|
oai_dc
|
Deformation analysis of a geocell mattress using a decoupled iterative method
|
Deformation analysis of a geocell mattress using a decoupled iterative method
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ling Zhang(Hunan University); Minghua Zhao(Hunan University); Heng Zhao(Hunan University)"
] |
Deformation analysis is a major concern in many geotechnical applications. In this paper, the deformation behavior of a geocell mattress subjected to symmetric loads was studied. The mattress was idealized as an elastic foundation beam. The horizontal beam-soil interfacial shear resistances at the beam top and bottom sides were taken into account by assuming the resistances to be linear with the relative horizontal displacements. A decoupled iterative method was employed to solve the differential displacement equations derived from the force analysis of a beam element and to obtain the solutions for the deformations and internal forces of the geocell reinforcement. The validity of the present solutions was verified by the existing finite element method and power-series solutions.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001788901
|
oai_dc
|
Optimization of modal load pattern for pushover analysis of building structures
|
Optimization of modal load pattern for pushover analysis of building structures
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mohsen Ali Shayanfar(Iran University of Science and Technology); Mansoor Ashoory(Iran University of Science and Technology); Taha Bakhshpoori(Iran University of Science and Technology); Basir Farhadi(Iran University of Science and Technology)"
] |
Nonlinear Static Procedures (NSPs) have been developed as a practical tool to estimate the seismic demand of structures. Several researches have accomplished to minimize errors of NSPs, namely pushover procedures, in the Nonlinear Time History Analysis (NTHA), as the most exact method. The most important issue in a typical pushover procedure is the pattern and technique of loading which are extracted based on structural dynamic fundamentals. In this paper, the coefficients of modal force combination is focused involving a meta-heuristic optimization algorithm to find the optimum load pattern which results in a response with minimum amount of errors in comparison to the NTHA counterpart. Other parameters of the problem are based on the FEMA recommendations for pushover analysis of building structures. The proposed approach is implemented on a high-rise 20 storey concrete moment resisting frame under three earthquake records. In order to demonstrate the effectiveness and robustness of the studied procedure the results are presented beside other well-known pushover methods such as MPA and the FEMA procedures, and the results show the efficiency of the proposed load patterns.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001788895
|
oai_dc
|
Modeling of combined thermal and mechanical action in roller compacted concrete dam by three-dimensional finite element method
|
Modeling of combined thermal and mechanical action in roller compacted concrete dam by three-dimensional finite element method
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"A.A. Abdulrazeg(Omar Al Mukhtar University); J. Noorzaei(Universiti Putra Malaysia); T.A. Mohammed(Universiti Putra Malaysia); M.S. Jaafar(Universiti Putra Malaysia)"
] |
A combined thermal and mechanical action in roller compacted concrete (RCC) dam analysis is carried out using a three-dimensional finite element method. In this work a numerical procedure for the simulation of construction process and service life of RCC dams is presented. It takes into account the more relevant features of the behavior of concrete such as hydration, ageing and creep. A viscoelastic model, including ageing effects and thermal dependent properties is adopted for the concrete. The different isothermal temperature influence on creep and elastic modulus is taken into account by the maturity concept, and the influence of the change of temperature on creep is considered by introducing a transient thermal creep term. Crack index is used to assess the risk of occurrence of crack either at short or long term. This study demonstrates that, the increase of the elastic modulus has been accelerated due to the high temperature of hydration at the initial stage, and consequently stresses are increased.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001788899
|
oai_dc
|
Shear strengthening effect by bonded GFRP strips and transverse steel on RC T-beams
|
Shear strengthening effect by bonded GFRP strips and transverse steel on RC T-beams
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"K.C. Panda(SOA University); S.K. Bhattacharyya(CSIR-Central Building Research Institute); S.V. Barai(IIT Kharagpur)"
] |
This study focuses on shear strengthening performance of simply supported reinforced concrete (RC) T-beams bonded by glass fibre reinforced polymer (GFRP) strips in different configuration, orientations and transverse steel reinforcement in different spacing. Eighteen RC T-beams of 2.5 m span are tested. Nine beams are used as control beam. The stirrups are provided in three different spacing such as without stirrups and with stirrups at a spacing of 200 mm and 300 mm. Another nine beams are used as strengthened beams. GFRP strips are bonded in shear zone in U-shape and side shape with two types of orientation of the strip at 45° and 90° to the longitudinal axis of the beam for each type of stirrup spacing. The experimental result indicates that the beam strengthened with GFRP strips at 45° orientation to the longitudinal axis of the beam are much more effective than 90° orientation. Also as transverse steel increases,the effectiveness of the GFRP strips decreases.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001788896
|
oai_dc
|
Analysis of thermo-rheologically complex structures with geometrical nonlinearity
|
Analysis of thermo-rheologically complex structures with geometrical nonlinearity
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Fatin F. Mahmoud(Zagazig Univeristy); Ahmed G. El-Shafei(Zagazig Univeristy); Mohamed A. Attia(Zagazig Univeristy)"
] |
A finite element computational procedure for the accurate analysis of quasistatic thermorheological complex structures response is developed. The geometrical nonlinearity, arising from large displacements and rotations (but small strains), is accounted for by the total Lagrangian description of motion. The Schapery’s nonlinear single-integral viscoelastic constitutive model is modified for a timestress-temperature-dependent behavior. The nonlinear thermo-viscoelastic constitutive equations are incrementalized leading to a recursive relationship and thereby the resulting finite element equations necessitate data storage from the previous time step only, and not the entire deformation history. The Newton-Raphson iterative scheme is employed to obtain a converged solution for the non-linear finite element equations. The developed numerical model is verified with the previously published works and a good agreement with them is found. The applicability of the developed model is demonstrated by analyzing two examples with different thermal/mechanical loading histories.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001788900
|
oai_dc
|
Strong earthquakes and measurement performance of masonry and adobe structures
|
Strong earthquakes and measurement performance of masonry and adobe structures
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Yanling Liu(Hainan Normal University); Qinkia Han(Atılım University)"
] |
Earthquakes, which are unavoidable natural phenomena in Turkey, have often produced economic and social disaster. The latest destructive earthquakes happened inVan city. Van, Turkey, earthquakes with M = 7.2 occurredon 23 October 2011 at 13:41 (local time), whose epicenterwas about 16 km north of Van (Tabanlıvillage) and M = 5.6 on 9 November 2011 epicentered near the town of Edremitsouth of Van in eastern Turkey and caused the loss of lifeand heavy damages. Both earthquakes killed 644 peopleand 2608 people were injured. Approximately 4000 buildings collapsed or were seriously damaged. The majority ofthe damaged structures were seismically insufficient, unreinforced masonry and adobe buildings in rural areas. In thispaper, site surveys of the damaged masonry and adobe buildings are presented and the reasons for the caused damagesare discussed in detail.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001788897
|
oai_dc
|
An efficient response surface method considering the nonlinear trend of the actual limit state
|
An efficient response surface method considering the nonlinear trend of the actual limit state
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Weitao Zhao(Shenyang Aerospace University); Zhiping Qiu(Beihang University); Yi Yang(Shenyang Aerospace University)"
] |
In structural reliability analysis, the response surface method is a powerful method to evaluate the probability of failure. However, the location of experimental points used to form a response surface function must be selected in a judicious way. It is necessary for the highly nonlinear limit state functions to consider the design point and the nonlinear trend of the limit state, because both of them influence the probability of failure. In this paper, in order to approximate the actual limit state more accurately, experimental points are selected close to the design point and the actual limit state, and consider the nonlinear trend of the limit state. Linear, quadratic and cubic polynomials without mixed terms are utilized to approximate the actual limit state. The direct Monte Carlo simulation on the approximated limit state is carried out to determine the probability of failure. Four examples are given to demonstrate the efficiency and the accuracy of the proposed method for both numerical and implicit limit states.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001788902
|
oai_dc
|
Constraint-based fracture mechanics analysis of cylinders with internal circumferential cracks
|
Constraint-based fracture mechanics analysis of cylinders with internal circumferential cracks
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Michael Bach(Carleton University); Xin Wang(Carleton University)"
] |
In this paper, constraint-based fracture mechanics analyses of hollow cylinders with internal circumferential crack under tensile loading are conducted. Finite element analyses of the cracked cylinders are carried out to determine the fracture parameters including elastic T-stresses, and fully-plastic J-integrals. Linear elastic finite element analysis is conducted to obtain the T-stresses, and elastic-plastic analysis is conducted to obtain the fully plastic J-integrals. A wide range of cylinder geometries are studied, with cylinder radius ratios of ri/ro = 0.2 to 0.8 and crack depth ratio a/t = 0.2 to 0.8. Fully plastic J-integrals are obtained for Ramberg-Osgood power law hardening material of n = 3, 5 and 10. These fracture parameters are then used to construct conventional and constraint-based failure assessment diagrams (FADs) to determine the maximum load carrying capacity of cracked cylinders. It is demonstrated that these tensile loaded cylinders with circumferential cracks are under low constraint conditions, and the load carrying capacity are higher when the low constraint effects are properly accounted for, using constraint-based FADs, comparing to the predictions from the conventional FADs.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001788898
|
oai_dc
|
Spatial mechanical behaviors of long-span V-shape rigid frame composite arch bridges
|
Spatial mechanical behaviors of long-span V-shape rigid frame composite arch bridges
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Hongye Gou(Southwest Jiaotong University); Qianhui Pu(Southwest Jiaotong University); Junming Wang(Southwest Jiaotong University); Zeyu Chen(China Railway Siyuan Survey and Design Group Co. Ltd.); Shiqiang Qin(Southwest Jiaotong University)"
] |
The Xiaolan channel super large bridge is unique in style and with greatest span in the world with a total length of 7686.57 m. The main bridge with spans arranged as 100m+220m+100m is a combined structure composed of prestressed concrete V-shape rigid frame and concrete-filled steel tubular flexible arch. First of all, the author compiles APDL command flow program by using the unit birth-death technique and establishes simulation calculation model in the whole construction process. The creep characteristics of concrete are also taken into account. The force ratio of the suspender, arch and beam is discussed. The authors conduct studies on the three-plate webs’s rule of shear stress distribution, the box girder’s longitudinal bending normal stress on every construction stage, meanwhile the distribution law of longitudinal bending normal stress and transverse bending normal stress of completed bridge’s box girder.
Results show that, as a new combined bridge, it is featured by: Girder and arch resist forces together; Moment effects of the structure are mainly presented as compressed arch and tensioned girder; The bridge type brings the girder and arch on resisting forces into full play; Great in vertical stiffness and slender in appearance.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001774942
|
oai_dc
|
Experimental calibration of forward and inverse neural networks for rotary type magnetorheological damper
|
Experimental calibration of forward and inverse neural networks for rotary type magnetorheological damper
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Subrata Bhowmik(Technical University of Denmark); Felix Weber(Swiss Federal Laboratories for Materials Science and Technology); Jan Høgsberg(Technical University of Denmark)"
] |
This paper presents a systematic design and training procedure for the feed-forward backpropagation neural network (NN) modeling of both forward and inverse behavior of a rotary magnetorheological (MR) damper based on experimental data. For the forward damper model, with damper force as output, an optimization procedure demonstrates accurate training of the NN architecture with only current and velocity as input states. For the inverse damper model, with current as output, the absolute value of velocity and force are used as input states to avoid negative current spikes when tracking a desired damper force. The forward and inverse damper models are trained and validated experimentally, combining a limited number of harmonic displacement records, and constant and half-sinusoidal current records. In general the validation shows accurate results for both forward and inverse damper models, where the observed modeling errors for the inverse model can be related to knocking effects in the measured force due to the bearing plays between hydraulic piston and MR damper rod. Finally, the validated models are used to emulate pure viscous damping. Comparison of numerical and experimental results demonstrates good agreement in the post-yield region of the MR damper, while the main error of the inverse NN occurs in the pre-yield region where the inverse NN overestimates the current to track the desired viscous force.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001774943
|
oai_dc
|
Investigating the effect of bond slip on the seismic response of RC structures
|
Investigating the effect of bond slip on the seismic response of RC structures
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mohammad Mehdi Fallah(Ferdowsi University of Mashhad); Ahmad Shooshtari(Ferdowsi University of Mashhad); Hamid Reza Ronagh(The University of Queensland)"
] |
It is reasonable to assume that reinforced concrete (RC) structures enter the nonlinear range of response during a severe ground motion. Numerical analysis to predict the behaviour therefore must allow for the presence of nonlinear deformations if an accurate estimate of seismic response is aimed. Among the factors contributing to inelastic deformations, the influence of the degradation of the bond slip phenomenon is important. Any rebar slip generates an additional rotation at the end regions of structural members which are not accounted for in a conventional analysis. Although these deformations could affect the seismic response of RC structures considerably, they are often neglected due to the unavailability of suitable models. In this paper, the seismic response of two types of RC structures, designed according to the Iranian concrete code (ABA) and the Iranian seismic code (2800), are evaluated using nonlinear dynamic and static analyses. The investigation is performed using nonlinear dynamic and static pushover analysis considering the deformations due to anchorage slip. The nonlinear analysis results confirm that bond slip significantly influences the seismic behavior of RC structure leading to an increase of lateral deformations by up to 30% depending on the height of building. The outcomes also identify important parameters affecting the extent of this influence.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001774945
|
oai_dc
|
Structural analysis and optimization of large cooling tower subjected to wind loads based on the iteration of pressure
|
Structural analysis and optimization of large cooling tower subjected to wind loads based on the iteration of pressure
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Gang Li(Dalian University of Technology); Wen-bin Cao(Dalian University of Technology)"
] |
The wind load is always the dominant load of cooling tower due to its large size, complex geometry and thin-wall structure. At present, when computing the wind-induced response of the large-scale cooling tower, the wind pressure distribution is obtained based on code regulations, wind tunnel test or computational fluid dynamic (CFD) analysis, and then is imposed on the tower structure. However, such method fails to consider the change of the wind load with the deformation of cooling tower, which may result in error of the wind load. In this paper, the analysis of the large cooling tower based on the iterative method for wind pressure is studied, in which the advantages of CFD and finite element method (FEM) are combined in order to improve the accuracy. The comparative study of the results obtained from the code regulations and iterative method is conducted. The results show that with the increase of the mean wind speed, the difference between the methods becomes bigger. On the other hand, based on the design of experiment (DOE), an approximate model is built for the optimal design of the large-scale cooling tower by a two-level optimization strategy, which makes use of code-based design method and the proposed iterative method. The results of the numerical example demonstrate the feasibility and efficiency of the proposed method.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001774940
|
oai_dc
|
Condition assessment of raking damaged bulk carriers under vertical bending moments
|
Condition assessment of raking damaged bulk carriers under vertical bending moments
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"김도균(포항공과대학교); 유수영(Phang University of Science and Technolo); 최한석(포항공과대학교)"
] |
This paper concerns about the raking damages on the ultimate residual hull girder strength of bulk carriers by applying the modified R-D diagram (advanced method). The limited raking damage scenarios, based on the IMO’s probability density function of grounding accidents, were carried out by using sampling technique. Recently, innovative method for the evaluation of the structural condition assessment, which covers the residual strength and damage index diagram (R-D diagram), was proposed by Paik et al. (2012). This concept is applied in the present study and modified R-D diagram, which can be considered vessel size effect, is then proposed. Four different types of bulk carrier structures, i.e., Handysize (37K), Supramax (57K), Kamsarmax (82K) and Capesize (181K) by Common Structural Rule (CSR), were applied to draw the general tendency. The ALPS/HULL, intelligent supersize finite element method, was employed for the ultimate longitudinal strength analysis. The obtained empirical formulas will be useful for the condition assessment of bulk carrier structures. It can also cover different sizes of the bulk carriers in terms of ultimate longitudinal strength. Important insights and findings with useful guidelines developed in this study are summarized.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001774939
|
oai_dc
|
Development of non-destructive method of detecting steel bars corrosion in bridge decks
|
Development of non-destructive method of detecting steel bars corrosion in bridge decks
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Javad Sadeghi(Iran University of Science and Technology); Farshad Hashemi Rezvani(The University of Queensland)"
] |
One of the most common defects in reinforced concrete bridge decks is corrosion of steel reinforcing bars. This invisible defect reduces the deck stiffness and affects the bridge’s serviceability. Regular monitoring of the bridge is required to detect and control this type of damage and in turn, minimize repair costs. Because the corrosion is hidden within the deck, this type of damage cannot be easily detected by visual inspection and therefore, an alternative damage detection technique is required. This research develops a non-destructive method for detecting reinforcing bar corrosion. Experimental modal analysis, as a non-destructive testing technique, and finite element (FE) model updating are used in this method. The location and size of corrosion in the reinforcing bars is predicted by creating a finite element model of bridge deck and updating the model characteristics to match the experimental results. The practicality and applicability of the proposed method were evaluated by applying the new technique to a two spans bridge for monitoring steel bar corrosion. It was shown that the proposed method can predict the location and size of reinforcing bars corrosion with reasonable accuracy.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001774938
|
oai_dc
|
A new SDOF method of one-way reinforced concrete slab under non-uniform blast loading
|
A new SDOF method of one-way reinforced concrete slab under non-uniform blast loading
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Wei Wang(National University of Defense Technology); Duo Zhang(National University of Defense Technology); Fangyun Lu(National University of Defense Technology); Ruichao Liu(Luoyang Institute of Hydraulic Engineering and Technology)"
] |
A new effective model for calculation of the equivalent uniform blast load for non-uniform blast load such as close-in explosion of a one-way square and rectangle reinforced concrete slab is proposed in this paper. The model is then validated using single degree of freedom (SDOF) system with the experiments and blast tests for square slabs and rectangle slabs. Test results showed that the model is accurate in predicting the damage level on the tested RC slabs under the given explosive charge weight and stand-off distance especially for close-in blast load. The results are also compared with those obtained by conventional SDOF analysis and finite element (FE) analysis using solid elements. It is shown that the new model is more accurate than the conventional SDOF analysis and is running faster than the FE analysis.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001774944
|
oai_dc
|
Dynamic response of railway bridges traversed simultaneously by opposing moving trains
|
Dynamic response of railway bridges traversed simultaneously by opposing moving trains
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mohammad Ali Rezvani(Iran University of Science and Technology); Farzad Vesali(Iran University of Science and Technology); Atefeh Eghbali(Iran University of Science and Technology)"
] |
Bridges are vital components of the railroads. High speed of travel, the periodic and oscillatory nature of the loads and the comparable vehicle bridge weight ratio distinguish the railway bridges from the road bridges. The close proximity between estimations by some numerical methods and the measured data for the bridge-vehicle dynamic response under the moving load conditions has boosted the confidence in the numerical analyses. However, there is hardly any report regarding the responses of the railway bridges under the effect of the trains entering from the opposite directions while running at unequal speed and having dissimilar geometries. It is the purpose of this article to present an analytical method for the dynamic analysis of the railway bridges under the influence of two opposing series of moving loads. The bridge structural damping and many modes of vibrations are included. The concept of modal superposition is used to solve for the system motion equations. The method of solution is indeed a computer assisted analytical solution. It solves for the system motion equations and gives output in terms of the bridge deflection. Some case studies are also considered for the validation of the proposed method. Furthermore, the effects of varying some parameters such as the distance between the bogies, and the bogie wheelset distance are studied. Also, the conditions of resonance and cancellation in the dynamic response for a variety of vehiclebridge specifications are investigated.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001774941
|
oai_dc
|
Seismic analysis of frame-strap footing-nonlinear soil system to study column forces
|
Seismic analysis of frame-strap footing-nonlinear soil system to study column forces
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Vivek Garg(Maulana Azad National Institute of Technology); Manjeet S. Hora(Maulana Azad National Institute of Technology)"
] |
The differential settlements and rotations among footings cannot be avoided when the framefooting-soil system is subjected to seismic/dynamic loading. Also, there may be a situation where column(s) of a building are located near adjoining property line causes eccentric loading on foundation system. The strap beams may be provided to control the rotation of the footings within permissible limits caused due to such eccentric loading. In the present work, the seismic interaction analysis of a three-bay three-storey, space frame-footing-strap beam-soil system is carried out to investigate the interaction behavior using finite element software (ANSYS). The RCC structure and their foundation are assumed to behave in linear manner while the supporting soil mass is treated as nonlinear elastic material. The seismic interaction analyses of space frame-isolated footing-soil and space frame-strap footing-soil systems are carried out to evaluate the forces in the columns. The results indicate that the bending moments of very high magnitude are induced at column bases resting on eccentric footing of frame-isolated footing-soil interaction system. However, use of strap beams controls these moments quite effectively. The soil-structure interaction effect causes significant redistribution of column forces compared to non-interaction analysis. The axial forces in the columns are distributed more uniformly when the interaction effects are considered in the analysis.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001742748
|
oai_dc
|
Nonlinear analysis of thin shallow arches subject to snap-through using truss models
|
Nonlinear analysis of thin shallow arches subject to snap-through using truss models
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"H. Xenidis(Aristotle University of Thessaloniki); K. Morfidis(Institute of Engineering Seismology and Earthquake Engineering); P.G. Papadopoulos(Aristotle University of Thessaloniki)"
] |
In this study a truss model is used for the geometrically nonlinear static and dynamic analysis of a thin shallow arch subject to snap-through. Thanks to the very simple geometry of a truss, the equilibrium conditions can be easily written and the global stiffness matrix can be easily updated with respect to the deformed structure, within each step of the analysis. A very coarse discretization is applied; so, in a very simple way, the high frequency modes are suppressed from the beginning and there is no need to develop a complicated reduced-order technique. Two short computer programs have been developed for the geometrically nonlinear static analysis by displacement control of a plane truss model of a structure as well as for its dynamic analysis by the step-by-step time integration algorithm of trapezoidal rule, combined with a predictor-corrector technique. These two short, fully documented computer programs are applied on the geometrically nonlinear static and dynamic analysis of a specific thin shallow arch subject to snap-through.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001742745
|
oai_dc
|
Reshoring effects on deflections of multi-shored flat plate systems under construction
|
Reshoring effects on deflections of multi-shored flat plate systems under construction
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"강수민(충북대학교); 엄태성(단국대학교); 김재요(광운대학교)"
] |
RC flat plates that have no flexural stiffness by boundary beams may be governed by a serviceability as well as a strength condition. A construction sequence and its impact on the distributions of construction loads among slabs tied by shores are decisive factors influencing immediate and long term performances of flat plate. Over-loading and tensile cracking in early-aged slabs significantly increase the deflection of a flat plate system under construction. A reshoring work may be helpful in reducing slab deflections by controlling the vertical distributions of construction loads in a multi-shored flat plate system. In this study, a change of construction loads by reshoring works and its effects on deflections of flat plate systems under construction are analyzed. The slab construction loads with various reshoring schemes are defined by a simplified method, and the practical calculation of slab deflections with considering construction sequences and concrete cracking effects is applied. From parametric studies, the reshoring works are verified to reduce construction loads and slab deflections.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001742747
|
oai_dc
|
Properties of integral operators in complex variable boundary integral equation in plane elasticity
|
Properties of integral operators in complex variable boundary integral equation in plane elasticity
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Y.Z. Chen(Jiangsu University); Z.X. Wang(Jiangsu University)"
] |
This paper investigates properties of integral operators in complex variable boundary integral equation in plane elasticity, which is derived from the Somigliana identity in the complex variable form. The generalized Sokhotski-Plemelj’s formulae are used to obtain the BIE in complex variable. The properties of some integral operators in the interior problem are studied in detail. The Neumann and Dirichlet problems are analyzed. The prior condition for solution is studied. The solvability of the formulated problems is addressed. Similar analysis is carried out for the exterior problem. It is found that the properties of some integral operators in the exterior boundary value problem (BVP) are quite different from their counterparts in the interior BVP.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001742749
|
oai_dc
|
AGV-induced floor micro-vibration assessment in LCD factories by using a regressional modified Kanai-Tajimi moving force model
|
AGV-induced floor micro-vibration assessment in LCD factories by using a regressional modified Kanai-Tajimi moving force model
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"C.L. Lee(The University of Hong Kong); R.K.L. Su(The University of Hong Kong); Y.P. Wang(National Chiao-Tung University)"
] |
This study explores the floor micro-vibrations induced by the automated guided vehicles (AGVs) in liquid-crystal-display (LCD) factories. The relationships between moving loads and both the vehicle weights and speeds were constructed by a modified Kanai-Tajimi (MKT) power spectral density (PSD) function whose best-fitting parameters were obtained through a regression analysis by using experimental acceleration responses of a small-scale three-span continuous beam model obtained in the laboratory. The AGV induced floor micro-vibrations under various AGV weights and speeds were then assessed by the proposed regressional MKT model. Simulation results indicate that the maximum floor micro-vibrations of the target LCD factory fall within the VC-B and VC-C levels when AGV moves at a lower speed of 1.0 m/s, while they may exceed the acceptable VC-B level when AGV moves at a higher speed of 1.5 m/s. The simulated floor micro-vibration levels are comparable to those of typical LCD factories induced by AGVs moving normally at a speed between 1.0 m/s and 2.0 m/s. Therefore, the numerical algorithm that integrates a simplified sub-structural multi-span continuous beam model and a proposed regressional MKT moving force model can provide a satisfactory prediction of AGV-induced floor micro-vibrations in LCD factories, if proper parameters of the MKT moving force model are adopted.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001742746
|
oai_dc
|
Identification of isotropic and orthotropic constitutive parameters by FEA-free energy-based inverse characterization method
|
Identification of isotropic and orthotropic constitutive parameters by FEA-free energy-based inverse characterization method
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Shen Shang(The University of Akron); 윤군진(서울대학교); Shilpa Kunchum(The University of Akron); Joan Carletta(The University of Akron)"
] |
In this paper, identification of isotropic and orthotropic linear elastic material constitutive parameters has been demonstrated by a FEA-free energy-based inverse analysis method. An important feature of the proposed method is that it requires no finite element (FE) simulation of the tested material. Full-field displacements calculated using digital image correlation (DIC) are used to compute DIC stress fields enforcing the equilibrium condition and DIC strain fields using interpolation functions. Boundary tractions and displacements are implicitly recast into an objective function that measures the energy residual of external work and internal elastic strain energy. The energy conservation principle states that the residual should be zero, and so minimizing this objective function inversely identifies the constitutive parameters. Synthetic data from simulated testing of isotropic materials and orthotropic composite materials under 2D plane stress conditions are used for verification of the proposed method. When identifying the constitutive parameters, it is beneficial to apply loadings in multiple directions, and in ways that create non-uniform stress distributions. The sensitivity of the parameter identification method to noise in both the measured full-field DIC displacements and loadings has been investigated.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001742744
|
oai_dc
|
Design and homogenization of metal sandwich tubes with prismatic cores
|
Design and homogenization of metal sandwich tubes with prismatic cores
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Kai Zhang(Northwestern Polytechnical University); Zichen Deng(Northwestern Polytechnical University); Huajiang Ouyang(University of Liverpool); Jiaxi Zhou(Hunan University)"
] |
Hollow cylindrical tubes with a prismatic sandwich lining designed to replace the solid cross-sections are studied in this paper. The sections are divided by a number of revolving periodic unit cells and three topologies of unit cells (Square, Triangle and Kagome) are proposed. Some types of multiple-topology designed materials are also studied. The feasibility and accuracy of a homogenization method for obtaining the equivalent parameters are investigated. As the curved elements of a unit cell are represented by straight elements in the method and the ratios of the lengths of the curved elements to the lengths of the straight elements vary with the changing number of unit cells, some errors may be introduced. The frequencies of the first five modes and responses of the complete and equivalent models under an internal static pressure and an internal step pressure are compared for investigating the scope of applications of the method. The lower bounds and upper bounds of the number of Square, Triangular and Kagome cells in the sections are obtained. It is shown that treating the multiple-topology designed materials as a separate-layer structure is more accurate than treating the structure as a whole.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001742750
|
oai_dc
|
Free vibration of tapered arches made of axially functionally graded materials
|
Free vibration of tapered arches made of axially functionally graded materials
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"S. Rajasekaran(PSG College of Technology)"
] |
The free vibration of axially functionally graded tapered arches including shear deformation and rotatory inertia are studied through solving the governing differential equation of motion. Numerical results are presented for circular, parabolic, catenary, elliptic and sinusoidal arches with hinged-hinged, hinged-clamped and clamped-clamped end restraints. In this study Differential Quadrature element of lowest order (DQEL) or Lagrangian Interpolation technique is applied to solve the problems. Three general taper types for rectangular section are considered. The lowest four natural frequencies are calculated and compared with the published results.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001742741
|
oai_dc
|
Joint parameter identification of a cantilever beam using sub-structure synthesis and multi-linear regression
|
Joint parameter identification of a cantilever beam using sub-structure synthesis and multi-linear regression
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Sanjay B. Ingole(Government Polytechnic); Animesh Chatterjee(Visvesvaraya National Institute of Technology)"
] |
Complex structures are usually assembled from several substructures with joints connecting them together. These joints have significant effects on the dynamic behavior of the assembled structure and must be accurately modeled. In structural analysis, these joints are often simplified by assuming ideal boundary conditions. However, the dynamic behavior predicted on the basis of the simplified model may have significant errors. This has prompted the researchers to include the effect of joint stiffness in the structural model and to estimate the stiffness parameters using inverse dynamics. In the present work, structural joints have been modeled as a pair of translational and rotational springs and frequency equation of the overall system has been developed using sub-structure synthesis. It is shown that using first few natural frequencies of the system, one can obtain a set of over-determined system of equations involving the unknown stiffness parameters. Method of multi-linear regression is then applied to obtain the best estimate of the unknown stiffness parameters. The estimation procedure has been developed for a two parameter joint stiffness matrix.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001741665
|
oai_dc
|
Influence of incident angles of earthquakes on inelastic responses of asymmetric-plan structures
|
Influence of incident angles of earthquakes on inelastic responses of asymmetric-plan structures
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Van Tu Nguyen(Kunsan National University); 김두기(군산대학교)"
] |
This paper presents the influence of incident angles of earthquakes on inelastic dynamic responses of asymmetry single story buildings under seismic ground motions. The dynamic responses such as internal forces and rotational ductility factor are used to evaluate the importance of the incident angles of ground motions in the inelastic range of structural behavior. The base shear and torque (BST) response histories of the resisting elements and of the building are used to prove that the shape of the BST surface of the building can be a practical tool to represent those of all resisting elements. This paper also shows that the different global forces which produce the maximum demands in the resisting elements tend to converge toward a single distribution in a definable intensity range, and this single distribution is related to the resistance distribution of the building.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001741664
|
oai_dc
|
Axisymmetrical bending of single- and multi-span functionally graded hollow cylinders
|
Axisymmetrical bending of single- and multi-span functionally graded hollow cylinders
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Z.G. Bian(Zhejiang University); Y.H. Wang(Zhejiang University)"
] |
Single- and multi-span orthotropic functionally graded hollow cylinders subjected to axisymmetrical bending are investigated on the basis of a unified shear deformable shell theory, in which the transverse displacement is expressed by means of a general shape function. To approach the through-thickness inhomogeneity of the hollow cylinder, a laminated model is employed. The shape function therefore shall be determined for each fictitious layer. To improve the computational efficiency, we resort to a transfer matrix method. Based on the principle of minimum potential energy, equilibrium equations are established, which are then solved analytically using the transfer matrix method for arbitrary boundary conditions. Numerical comparisons among a third-order shear deformable shell theory, an exact elastic theory and the present theory are provided for a simply supported hollow cylinder, from which the present theory turns out to be superior in stress estimation. Distributions of displacements and stresses in single- and three-span hollow cylinders with different boundary conditions are also illustrated in numerical examples.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001741662
|
oai_dc
|
Application of the ANFIS model in deflection prediction of concrete deep beam
|
Application of the ANFIS model in deflection prediction of concrete deep beam
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mohammad Mohammadhassani(University of Malaya); Hossein Nezamabadi-Pour(Shahid Bahonar University of Kerman); MohdZamin Jumaat(University of Malaya); Mohammed Jameel(University of Malaya); S.J.S.Hakim(University of Malaya); Majid Zargar(University of Malaya)"
] |
With the ongoing development in the computer science areas of artificial intelligence and computational intelligence, researchers are able to apply them successfully in the construction industry. Given the complexities indeep beam behaviour and the difficulties in accurate evaluation of its deflection,the current study has employed the Adaptive Network-based Fuzzy Inference System (ANFIS) as one of the modelling tools to predict deflection for high strength self compacting concrete (HSSCC) deep beams. In this study, about 3668measured data on eight HSSCC deep beams are considered. Effective input data and the corresponding deflection as output data were recorded at all loading stages up to failure load for all tested deep beams. The results of ANFIS modelling and the classical linear regression were compared and concluded that the ANFIS results are highly accurate, precise and satisfactory.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001741667
|
oai_dc
|
Mesh topological form design and geometrical configuration generation for cable-network antenna reflector structures
|
Mesh topological form design and geometrical configuration generation for cable-network antenna reflector structures
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Wang Liu(National University of Defense Technology); Dong-Xu Li(National University of Defense Technology); Jian-Ping Jiang(National University of Defense Technology)"
] |
A well-designed mesh shape of the cable net is of essential significance to achieve high performance of cable-network antenna reflectors. This paper is concerned with the mesh design problem for such antenna reflector structure. Two new methods for creating the topological forms of the cable net are first presented. Among those, the cyclosymmetry method is useful to generate different polygon-faceted meshes, while the topological mapping method is suitable for acquiring triangle-faceted meshes with different mesh grid densities. Then, the desired spatial paraboloidal mesh geometrical configuration in the state of static equilibrium is formed by applying a simple mesh generation approach based on the force density method. The main contribution of this study is that a general technical guide for how to create the connectivities between the nodes and members in the cable net is provided from the topological point of view. With the new idea presented in this paper, multitudes of mesh configurations with different net patterns can be sought by a certain rule rather than by empiricism, which consequently gives a valuable technical reference for the mesh design of this type of cable-network structures in the engineering.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001741663
|
oai_dc
|
Full-scale testing and modeling of the mechanical behavior of shield TBM tunnel joints
|
Full-scale testing and modeling of the mechanical behavior of shield TBM tunnel joints
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Wen-qi Ding(Tongji University); Yi-cheng Peng(Tongji University); Zhi-guo Yan(Tongji University); Bi-wei Shen(Tongji University); He-hua Zhu(Tongji University); Xin-xin Wei(Tongji University)"
] |
For shield TBM (Tunnel Boring Machine) tunnel lining, the segment joint is the most critical component for determining the mechanical response of the complete lining ring. To investigate the mechanical behavior of the segment joint in a water conveyance tunnel, which is different from the vehicle tunnel because of the external loads and the high internal water pressure during the tunnel’s service life, full-scale joint tests were conducted. The main advantage of the joint tests over previous ones was the definiteness of the loads applied to the joints using a unique testing facility and the acquisition of the mechanical behavior of actual joints. Furthermore, based on the test results and the theoretical analysis, a mechanical model of segment joints has been proposed, which consists of all important influencing factors,including the elastic-plastic behavior of concrete, the pre-tightening force of the bolts and the deformations of all joint components, i.e., concrete blocks, bolts and cast iron panels. Finally, the proposed mechanical model of segment joints has been verified by the aforementioned full-scale joint tests.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001741657
|
oai_dc
|
Geometrically nonlinear analysis of plane frames composed of flexibly connected members
|
Geometrically nonlinear analysis of plane frames composed of flexibly connected members
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"H. Gorgun(Dicle University)"
] |
Beam-to-column connections behaviour plays an important role in the analysis and design of steel and precast concrete structures. The paper presents a computer-based method for geometrically nonlinear frames with semi-rigid beam-to-column connections. The analytical procedure employs modified stability functions to model the effect of axial force on the stiffness of members. The member modified stiffness matrix, and the modified fixed end forces for various loads were found. The linear and nonlinear analyses were applied for two planar steel structures. The method is readily implemented on a computer using matrix structural analysis techniques and is applicable for the efficient nonlinear analysis of frameworks.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001741661
|
oai_dc
|
Lateral seismic response of building frames considering dynamic soil-structure interaction effects
|
Lateral seismic response of building frames considering dynamic soil-structure interaction effects
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"S. Hamid RezaTabatabaiefar(University of Technology Sydney); Behzad Fatahi(University of Technology Sydney); Bijan Samali(University of Technology Sydney)"
] |
In this study, to have a better judgment on the structural performance, the effects of dynamic Soil-Structure Interaction (SSI) on seismic behaviour and lateral structural response of mid-rise moment resisting building frames are studied using Finite Difference Method. Three types of mid-rise structures,including 5, 10, and 15 storey buildings are selected in conjunction with three soil types with the shear wave velocities less than 600m/s, representing soil classes Ce, De and Ee, according to Australian Standard AS 1170.4. The above mentioned frames have been analysed under two different boundary conditions: (i) fixed-base (no soil-structure interaction), and (ii) flexible-base (considering soil-structure interaction). The results of the analyses in terms of structural lateral displacements and drifts for the above mentioned boundary conditions have been compared and discussed. It is concluded that the dynamic soil-structure interaction plays a considerable role in seismic behaviour of mid-rise building frames including substantial increase in the lateral deflections and inter-storey drifts and changing the performance level of the structures from life safe to near collapse or total collapse. Thus, considering soil-structure interaction effects in the seismic design of mid-rise moment resisting building frames, particularly when resting on soft soil deposit, is essential.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001741666
|
oai_dc
|
Damage assessment of beams from changes in natural frequencies using ant colony optimization
|
Damage assessment of beams from changes in natural frequencies using ant colony optimization
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Aditi Majumdar(Indian Institute of Technology); Ambar De(Indian Institute of Technology); Damodar Maity(Indian Institute of Technology); Dipak Kumar Maiti(Indian Institute of Technology)"
] |
A numerical method is presented here to detect and assess structural damages from changes in natural frequencies using Ant Colony Optimization (ACO) algorithm. It is possible to formulate the inverse problem in terms of optimization and then to utilize a solution technique employing ACO to assess the damage/damages of structures using natural frequencies. The laboratory tested data has been used to verify the proposed algorithm. The study indicates the potentiality of the developed code to solve a wide range of inverse identification problems in a systematic manner. The developed code is used to assess damages of beam like structures using a first few natural frequencies. The outcomes of the simulated results show that the developed method can detect and estimate the amount of damages with satisfactory precision.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001789744
|
oai_dc
|
Study on economic performances of multi-span suspension bridges part 1: simple estimation formulas
|
Study on economic performances of multi-span suspension bridges part 1: simple estimation formulas
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Li-wen Zhang(Tongji University); Ru-cheng Xiao(Tongji University); Bin Sun(Tongji University); Yang Jiang(Tongji University); Xue-yi Zhang(Tongji University); Dong-li Zhuang(Tongji University); Yun-gang Zhou(Tongji University); Xue Tu(LIN Tung-yan & LI Guo-hao Consultants LTD)"
] |
A study on economic performances of consecutive multi-span suspension bridges is carried out. In this part of the study, material amount and structural cost estimation formulas of the bridges is derived based on the structural ultimate carrying capacity. The bridge cost includes the part of superstructure and the part of substructure. Three types of bridge foundations, bored piles, concrete caissons and floating foundations, are considered in substructure. These formulas are to be used for the parametric study of the bridge cost in order to define its more economical layout under different conditions in the part two of the study.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001789738
|
oai_dc
|
Probabilistic failure analysis of underground flexible pipes
|
Probabilistic failure analysis of underground flexible pipes
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Kong Fah Tee(University of Greenwich); Lutfor Rahman Khan(University of Greenwich); Hua-Peng Chen(University of Greenwich)"
] |
Methods for estimating structural reliability using probability ideas are well established. When the residual ultimate strength of a buried pipeline is exceeded the limit, breakage becomes imminent and the overall reliability of the pipe distribution network is reduced. This paper is concerned with estimating structural failure of underground flexible pipes due to corrosion induced excessive deflection, buckling, wall thrust and bending stress subject to externally applied loading. With changes of pipe wall thickness due to corrosion, the moment of inertia and the cross-sectional area of pipe wall are directly changed with time. Consequently, the chance of survival or the reliability of the pipe material is decreased over time. One numerical example has been presented for a buried steel pipe to predict the probability of failure using Hasofer-Lind and Rackwitz-Fiessler algorithm and Monte Carlo simulation. Then the parametric study and sensitivity analysis have been conducted on the reliability of pipeline with different influencing factors, e.g. pipe thickness, diameter, backfill height etc.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001789741
|
oai_dc
|
Constructability optimal design of reinforced concrete retaining walls using a multi-objective genetic algorithm
|
Constructability optimal design of reinforced concrete retaining walls using a multi-objective genetic algorithm
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"A. Kaveh(Iran University of Science and Technology); M. Kalateh-Ahani(Iran University of Science and Technology); M. Fahimi-Farzam(Iran University of Science and Technology)"
] |
The term “constructability” in regard to cast-in-place concrete construction refers mainly to the ease of reinforcing steel placement. Bar congestion complicates steel placement, hinders concrete placement and as a result leads to improper consolidation of concrete around bars affecting the integrity of the structure. In this paper, a multi-objective approach, based on the non-dominated sorting genetic algorithm (NSGA-II) is developed for optimal design of reinforced concrete cantilever retaining walls, considering minimization of the economic cost and reinforcing bar congestion as the objective functions. The structural model to be optimized involves 35 design variables, which define the geometry, the type of concrete grades, and the reinforcement used. The seismic response of the retaining walls is investigated using the well-known Mononobe-Okabe analysis method to define the dynamic lateral earth pressure. The results obtained from numerical application of the proposed framework demonstrate its capabilities in solving the present multi-objective optimization problem.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001789739
|
oai_dc
|
Improving design limits of strength and ductility of NSC beam by considering strain gradient effect
|
Improving design limits of strength and ductility of NSC beam by considering strain gradient effect
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"J.C.M. Ho(The University of Queensland); J. Peng(The University of Hong Kong)"
] |
In flexural strength design of normal-strength concrete (NSC) beams, it is commonly accepted that the distribution of concrete stress within the compression zone can be reasonably represented by an equivalent rectangular stress block. The stress block is governed by two parameters, which are normally denoted by and to stipulate the width and depth of the stress block. Currently in most of the reinforced concrete (RC) design codes, and are usually taken as 0.85 and 0.80 respectively for NSC. Nonetheless, in an experimental study conducted earlier by the authors on NSC columns, it was found that increases significantly with strain gradient, which means that larger concrete stress can be developed in flexure. Consequently, less tension steel will be required for a given design flexural strength, which improves the ductility performance. In this study, the authors’ previously proposed strain-gradient-dependent concrete stress block will be adopted to produce a series of design charts showing the maximum design limits of flexural strength and ductility of singly- and doubly- NSC beams. Through the design charts, it can be verified that the consideration of strain gradient effect can improve significantly the flexural strength and ductility design limits of NSC beams.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001789742
|
oai_dc
|
An experimental and numerical investigation on the effect of longitudinal reinforcements in torsional resistance of RC beams
|
An experimental and numerical investigation on the effect of longitudinal reinforcements in torsional resistance of RC beams
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"A.H. Khagehhosseini(Yazd University); R. Porhosseini(Yazd University); R. Morshed(Yazd University); A. Eslami(The University of Queensland)"
] |
It is evident that torsional resistance of a reinforced concrete (RC) member is attributed to both concrete and steel reinforcement. However, recent structural design codes neglect the contribution of concrete because of cracking. This paper reports on the results of an experimental and numerical investigation into the torsional capacity of concrete beams reinforced only by longitudinal rebars without transverse reinforcement. The experimental investigation involves six specimens tested under pure torsion. Each specimen was made using a cast-in-place concrete with different amounts of longitudinal reinforcements. To create the torsional moment, an eccentric load was applied at the end of the beam whereas the other end was fixed against twist, vertical, and transverse displacement. The experimental results were also compared with the results obtained from the nonlinear finite element analysis performed in ANSYS. The outcomes showed a good agreement between experimental and numerical investigation, indicating the capability of numerical analysis in predicting the torsional capacity of RC beams. Both experimental and numerical results showed a considerable torsional post-cracking resistance in high twist angle in test specimen. This post-cracking resistance is neglected in torsional design of RC members. This strength could be considered in the design of RC members subjected to torsion forces, leading to a more economical and precise design.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001789746
|
oai_dc
|
Study on economic performances of multi-span suspension bridges part 2: parametric study
|
Study on economic performances of multi-span suspension bridges part 2: parametric study
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Li-wen Zhang(Tongji University); Ru-cheng Xiao(Tongji University); Bin Sun(Tongji University); Yang Jiang(Tongji University); Xue-yi Zhang(Tongji University); Dong-li Zhuang(Tongji University); Yun-gang Zhou(Tongji University); Xue Tu(LIN Tung-yan & LI Guo-hao Consultants LTD)"
] |
Economic performances of consecutive multi-span suspension bridges are studied. The material amount and cost estimation formulas of the bridges have been derived in the part 1 of the study. A parametric study is carried out based on the formulas for investigating the different factors’ effect on the bridge cost. The factors include the bridge sag, the bridge span, the bridge foundation and the environment condition, etc. Then, an economical layout of the bridges is proposed for different conditions. Lastly, a selection of suspension bridge types is discussed based on the economy of bridges.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001789737
|
oai_dc
|
Reduction of the actuator oscillations in the flying vehicle under a follower force
|
Reduction of the actuator oscillations in the flying vehicle under a follower force
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"O. Kavianipour(Islamic Azad University); A.M. Khoshnood(K.N.T. University of Technology); S.H. Sadati(K.N.T. University of Technology)"
] |
Flexible behaviors in new aerospace structures can lead to a degradation of their control and guidance system and undesired performance. The objectives of the current work are to analyze the vibration resulting from the propulsion force on a Single Stage to Orbit (SSTO) launch vehicle (LV). This is modeled as a follower force on a free-free Euler-Bernoulli beam consisting of two concentrated masses at the two free ends. Once the effects on the oscillation of the actuators are studied, a solution to reduce these oscillations will also be developed. To pursue this goal, the stability of the beam model is studied using Ritz method. It is determined that the transverse and rotary inertia of the concentrated masses cause a change in the critical follower force. A new dynamic model and an adaptive control system for an SSTO LV have been developed that allow the aerospace structure to run on its maximum bearable propulsion force with the optimum effects on the oscillation of its actuators. Simulation results show that such a control model provides an effective way to reduce the undesirable oscillations of the actuators.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001789740
|
oai_dc
|
Design of pin jointed structures using teaching-learning based optimization
|
Design of pin jointed structures using teaching-learning based optimization
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Vedat Toğan(Karadeniz Technical University)"
] |
A procedure employing a Teaching-Learning Based Optimization (TLBO) method is developed to design discrete pin jointed structures. TLBO process consists of two parts: the first part represents learning from teacher and the second part illustrates learning by interaction among the learners. The effectiveness of the TLBO method is demonstrated on the four design optimization problems. The results are compared with those obtained using other various evolutionary optimization methods considering the best solution, average solution, and computational effort. Consequently, the TLBO algorithm works effectively and demonstrates remarkable performance for the optimization of engineering design applications.
|
토목공학
| null |
kci_detailed_000072.xml
|
|||
ART001792693
|
oai_dc
|
Analysis of multi leaf spring based on contact mechanics – a novel approach
|
Analysis of multi leaf spring based on contact mechanics – a novel approach
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"R. Kumaravelan(Velalar College of Engineering and Technology); S. Ramesh(Annai Mathammal Sheela Engineering College); V.C. Sathish Gandhi(Anna University); M. Joemax Agu(CSI Institute of Technology); M. Thanmanaselvi(Anna University)"
] |
A leaf spring, especially the longitudinal type is liable and persistent element in automotive suspension system. In the present scenario the composite materials are widely used in the automobile industries has shown a great interest in the replacement of steel spring due to high strength by weight ratio. Previous investigations focused on stresses and displacement analysis of single leaf spring for different materials. The present work aims to design and analysis of leaf spring for two different cases by considering the Young's modulus to yield strength ratio. In the first case the analysis deals with the design and analysis of a single cantilever solid triangle beam which is an equivalent beam of a spring with three leaves having uniform strength. In the second case a 3- beams of rectangular cross section has been considered which is equivalent to a spring with three leaves. The analysis was carried out based on contact mechanics approach. The results were compared, that the fiberglass composite leaf spring is suitable for high loading capacity, reliability and efficiency.
|
토목공학
| null |
kci_detailed_000072.xml
|
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.