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ART001363274
|
oai_dc
|
FE model updating based on hybrid genetic algorithm and its verification on numerical bridge model
|
FE model updating based on hybrid genetic algorithm and its verification on numerical bridge model
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"정대성(명지대학교); 김철영(명지대학교)"
] |
FE model-based dynamic analysis has been widely used to predict the dynamic characteristics of civil structures. In a physical point of view, an FE model is unavoidably different from the actual structure as being formulated based on extremely idealized engineering drawings and design data. The conventional model updating methods such as direct method and sensitivity-based parameter estimation are not flexible for model updating of complex and large structures. Thus, it is needed to develop a model updating method applicable to complex structures without restriction. The main objective
of this paper is to present the model updating method based on the hybrid genetic algorithm (HGA) by combining the genetic algorithm as global optimization method and modified Nelder-Mead’s Simplex method as local optimization method. This FE model updating method using HGA does not need the derivation of derivative function related to parameters and without application of complicated inverse analysis methods. In order to allow its application on diversified and complex structures, a commercial FEA tool is adopted to exploit previously developed element library and analysis algorithms. Moreover, an output-level objective function making use of measurement and analytical results is also presented to update simultaneously the stiffness and mass of the analysis model. The numerical examples demonstrated that the proposed method based on HGA is effective for the updating of the FE model of bridge structures.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001363272
|
oai_dc
|
Experimental study on fire performance of axially-restrained NSC and HSC columns
|
Experimental study on fire performance of axially-restrained NSC and HSC columns
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Bo Wu(South China University of Technology); Yi-Hai Li(South China University of Technology)"
] |
This paper describes fire performance of eight axially restrained reinforced concrete (RC) columns under a combination of two different load ratios and two different axial restraint ratios. The eight RC columns were all concentrically loaded and subjected to ISO834 standard fire on all sides. Axial restraints were imposed at the top of the columns to simulate the restraining effect of the rest of the whole frame. The axial restraint was effective when the column was expanding as well as contracting. As the results of the experiments have shown, the stiffness of the axial restraint and load level play an important role in the fire behaviors of both HSC and NSC columns. It is found that (a) the maximum deformations during expanding phase were influenced mostly by load ratio and hardly by axial restraint ratio, (b) For a given load ratio, axial restraint ratio had a great impact on the development of axial deformation during contraction phase beyond the initial equilibrium state, (c) increasing the axial restraint increased the value of restraint force generated in both the NSC and HSC columns, and (d) the development of column axial force during the contracting and cooling phase followed nearly parallel trend for columns under the same load ratio.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001363273
|
oai_dc
|
Numerical modelling of FRP strengthened RC beam-column joints
|
Numerical modelling of FRP strengthened RC beam-column joints
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Seyed S. Mahini(Yazd University); Hamid R. Ronagh(The University of Queensland)"
] |
This paper reports part of a comprehensive research study conducted at the University of Queensland on the ability of CFRP web-bonded systems in strengthening an exterior beam-column joint subjected to monotonic loads. One 1/2.2 scaled plain and four CFRP repaired/retrofitted joints subjected to monotonic loads were analysed using the nonlinear finite-element program ANSYS and the results were calibrated against experiments. The ANSYS model was employed in order to account for tension stiffening in concrete after cracking and a modified version of the Hognestad’s model was used to model the concrete compressive strength. The stress-strain properties of main steel bars were modelled using multilinear isotropic hardening model and the FRPs were modelled as anisotropic materials. A perfect
bond was assumed as nodes were shared between adjacent elements irrespective of their type. Good agreement between the numerical predictions and the experimental observation of the failure mechanisms
for all specimens were observed. Closeness of these results proved that the numerical analysis can be used by design engineers for the analysis of web-bonded FRP strengthened beam-column joints with confidence.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001363275
|
oai_dc
|
Characteristics of high performance reinforced concrete barriers that resist non-deforming projectile impact
|
Characteristics of high performance reinforced concrete barriers that resist non-deforming projectile impact
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"A. N. Dancygier(National Building Research Institute)"
] |
Current research and development of high performance concrete, together with study of phenomena that are pertinent to impact resistance, have lead to a new generation of barriers with improved properties to resist impact loads. The paper reviews major properties and mechanisms that affect impact resistance of concrete barriers as per criteria that characterize the resistance. These criteria are the perforation limit, penetration depth and the amount of front and rear face damage. From the long-known, single strength parameter that used to represent the barriers’ impact resistance, more of the concrete mix ingredients are now considered to be effective in determining it. It is shown that the size and hardness of the aggregates, use of steel fibers and micro-silica have different effects on performance under impact and
on the resistance. Additional pertinent phenomena, such as the rate and size effects, confinement and local versus global response, are pointed out with their reference to possible future developments in the design of impact resisting concrete barriers.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001349300
|
oai_dc
|
Solution of randomly excited stochastic differential equations with stochastic operator using spectral stochastic finite element method (SSFEM)
|
Solution of randomly excited stochastic differential equations with stochastic operator using spectral stochastic finite element method (SSFEM)
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Hussein A.(Higher Technical Institute); El-Tawil M.(Cairo University); El-Tahan W.(Cairo University); Mahmoud, A. A.(Cairo University)"
] |
This paper considers the solution of the stochastic differential equations (SDEs) with random operator and/or random excitation using the spectral SFEM. The random system parameters (involved in the operator) and the random excitations are modeled as second order stochastic processes defined only by their means and covariance functions. All random fields dealt with in this paper are continuous and do not have known explicit forms dependent on the spatial dimension. This fact makes the usage of the finite element (FE) analysis be difficult. Relying on the spectral properties of the covariance function, the Karhunen-Loeve expansion is used to represent these processes to overcome this difficulty. Then, a spectral approximation for the stochastic response (solution) of the SDE is obtained based on the implementation of the concept of generalized inverse defined by the Neumann expansion. This leads to an explicit expression for the solution process as a multivariate polynomial functional of a set of uncorrelated random variables that enables us to compute the statistical moments of the solution vector. To check the validity of this method, two applications are introduced which are, randomly loaded simply supported reinforced concrete beam and reinforced concrete cantilever beam with random bending rigidity. Finally, a more general application, randomly loaded simply supported reinforced concrete beam with random bending rigidity, is presented to illustrate the method.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001349315
|
oai_dc
|
Effective lengths of braced frame columns
|
Effective lengths of braced frame columns
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Konuralp Girgin(Istanbul Technical University); Günay Özmen(Istanbul Technical University)"
] |
In several design codes and specifications, simplified formulae and charts are given for determining the effective lengths of frame columns. It is shown that these formulae may yield rather erroneous results in certain cases. This is due to the fact that, the code formulae utilise only local stiffness distributions. In this paper, a simplified procedure for determining approximate values for the buckling loads of braced frames is developed. The procedure utilises a fictitious load analysis of frames and yields errors less than 10%, which may be considered suitable for design purposes. The proposed procedure is applied to several numerical examples and it is shown that all the errors are in the acceptable range.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001461199
|
oai_dc
|
Parametric resonance of a rotating taper pre-twisted beam with cracks
|
Parametric resonance of a rotating taper pre-twisted beam with cracks
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Bo Wun Huang(Cheng Shiu University); Pu Ping Yu(Cheng Shiu University); Jwo Ming Jou(Cheng Shiu University)"
] |
토목공학
| null |
kci_detailed_000081.xml
|
||||
ART001349318
|
oai_dc
|
Stress concentration and deflection of simply supported box girder including shear lag effect
|
Stress concentration and deflection of simply supported box girder including shear lag effect
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Eiki Yamaguchi(Kyushu Institute of Technology); Taweep Chaisomphob(Sirindhorn International Institute of Technology); Jaturong Sa-nguanmanasak(Sirindhorn International Institute of Technology); Chartree Lertsima(Asian Engineering Consultants Corp.)"
] |
The shear lag has been studied for many years. Nevertheless, existing research gives a variety of stress concentration factors. Unlike the elementary beam theory, the application of load is not unique in reality. For example, concentrated load can be applied as point load or distributed load along the height of the web. This non-uniqueness may be a reason for the discrepancy of the stress concentration factors in the existing studies. The finite element method has been often employed for studying the effect of the shear lag. However, not many researches have taken into account the influence of the finite element mesh on the shear lag phenomenon, although stress concentration can be quite sensitive to the mesh employed in the finite element analysis. This may be another source for the discrepancy of the stress concentration factors. It also needs to be noted that much less studies seem to have been conducted for the shear lag effect on deflection while some design codes have formulas. The present study investigates the shear lag effect in a simply supported box girder by the three-dimensional finite element method using shell elements. The whole girder is modeled by shell elements, and extensive parametric study with respect to the geometry of a box girder is carried out. Not only stress concentration but also deflection is computed. The effect of the way load is applied and the dependency of finite element mesh on the shear lag are carefully treated. Based on the numerical results thus obtained, empirical formulas are proposed to compute stress concentration and deflection that includes the shear lag effect.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001461193
|
oai_dc
|
Buckling of fully and partially embedded non-prismatic columns using differential quadrature and differential transformation methods
|
Buckling of fully and partially embedded non-prismatic columns using differential quadrature and differential transformation methods
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"S. Rajasekaran(PSG College of Technology)"
] |
Numerical solution to buckling analysis of beams and columns are obtained by the method of differential quadrature (DQ) and harmonic differential quadrature (HDQ) for various support conditions considering the variation of flexural rigidity. The solution technique is applied to find the buckling load of fully or partially embedded columns such as piles. A simple semi- inverse method of DQ or HDQ is proposed for determining the flexural rigidities at various sections of non-prismatic column ( pile) partially and fully embedded given the buckling load , buckled shape and sub-grade reaction of the soil. The obtained results are compared with the existing solutions available from other numerical methods and analytical results. In addition, this paper also uses a recently developed technique, known as the differential transformation (DT) to determine the critical buckling load of fully or partially supported heavy prismatic piles as well as fully supported non-prismatic piles. In solving the problem, governing differential equation is converted to algebraic equations using differential transformation methods (DT) which must be solved together with applied boundary conditions. The symbolic programming package, Mathematica is ideally suitable to solve such recursive equations by considering fairly large number of terms.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001349306
|
oai_dc
|
Application of wavelet multiresolution analysis and artificial intelligence for generation of artificial earthquake accelerograms
|
Application of wavelet multiresolution analysis and artificial intelligence for generation of artificial earthquake accelerograms
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"G. Ghodrati Amiri(Iran University of Science & Technology); A. Bagheri(Iran University of Science & Technology)"
] |
This paper suggests the use of wavelet multiresolution analysis (WMRA) and neural network for generation of artificial earthquake accelerograms from target spectrum. This procedure uses the learning capabilities of radial basis function (RBF) neural network to expand the knowledge of the inverse mapping from response spectrum to earthquake accelerogram. In the first step, WMRA is used to
decompose earthquake accelerograms to several levels that each level covers a special range of frequencies, and then for every level a RBF neural network is trained to learn to relate the response spectrum to wavelet coefficients. Finally the generated accelerogram using inverse discrete wavelet transform is obtained. An example is presented to demonstrate the effectiveness of the method.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001349311
|
oai_dc
|
On the consideration of the masses of helical springs in damped combined systems consisting of two continua
|
On the consideration of the masses of helical springs in damped combined systems consisting of two continua
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"M. Gürgöze(Technical University of Istanbul); S. Zeren(Technical University of Istanbul); M. M. A. Bicak(Technical University of Istanbul)"
] |
This study is concerned with the establishment of the characteristic equation of a combined system consisting of a cantilever beam with a tip mass and an in-span visco-elastic helical spring-mass, considering the mass of the helical spring. After obtaining the “exact” characteristic equation of the combined system, by making use of a boundary value problem formulation, the characteristic equation is established via a transfer matrix method, as well. Further, the characteristic equation of a reduced system is obtained as a special case. Then, the characteristic equations are numerically solved for various combinations of the physical parameters. Further, comparison of the results with the massless spring case and the case in which the spring mass is partially considered, reveals the fact that neglecting or considering the mass of the spring partially can cause considerable errors for some combinations of the physical parameters of the system.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001461197
|
oai_dc
|
Rational designing of double-sided nail plate joints using the finite element method
|
Rational designing of double-sided nail plate joints using the finite element method
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Tinozivashe Zhou(University of Brighton); Z. W. Guan(The University of Liverpool)"
] |
Double-sided punched metal plate timber fasteners present projections on both sides, which offer improved joint fire resistance and better joint aesthetics. In this paper, 3-D nonlinear finite element models were developed to simulate double-sided nail plate fastener timber joints. The models, incorporating orthotropic elasticity, Hill’s yield criterion and elasto-plasticity and contact algorithms, are capable of simulating complex contact between the tooth and the timber and between the base plate and the timber in a fastener. Using validated models, parametric studies of the double-sided nail plate joints was undertaken to cover the tooth length and the tooth width. Optimal configuration was assumed to have been attained when increase in nail plate tooth width did not result in a raise in joint capacity, in conjunction with the optimum tooth length. This paper presents the first attempt to model and optimise tooth profile of double-sided nail plate fastener timber joints, which offers rational designs of such fasteners.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001359372
|
oai_dc
|
Experimental study of moment redistribution and load carrying capacity of externally prestressed continuous composite beams
|
Experimental study of moment redistribution and load carrying capacity of externally prestressed continuous composite beams
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Shiming Chen(Tongji University); Yuanlin Jia(Tongji University ); Xindi Wang(Tongji University)"
] |
A comparative experimental study of prestressed continuous steel-concrete composite beams was carried out. Two continuous composite beams were tested, one of which was plain continuous steelconcrete composite beam, while the other was a composite beam prestressed with external tendons. Cracking behavior and the load carrying capacity of the beams were investigated experimentally. Full plasticity was developed in the mid-span section each beam, the maximum moments attained at the internal support sections however were governed by local buckling which was related to the slenderness of composite section. It was found that in hogging moment regions, the ultimate resistance of an externally prestressed composite beam would be governed by either distortional lateral buckling or local
buckling, or interactive mode of these two buckling patterns. The results show that exerting prestressing on a continuous composite beam with external tendons will increase the extent of internal force and moment redistribution in the beam. The influences of local and distortional buckling on the behaviors of the composite continuous beams are discussed. The Moment redistribution and the load carrying capacity of the prestressed continuous composite beams are evaluated, and it is found that at the ultimate state, the moment redistribution in the prestrssed continuous composite beams is greater than that in non-prestressed composite beams.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001359316
|
oai_dc
|
Seismic response simulations of bridges considering shear-flexural interaction of columns
|
Seismic response simulations of bridges considering shear-flexural interaction of columns
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Jian Zhang(University of California); Shi-Yu Xu(University of California)"
] |
Bridge columns are subjected to combined actions of axial force, shear force and bending moment during earthquakes, caused by spatially-complex earthquake motions, features of structural configurations and the interaction between input and response characteristics. Combined actions can have significant effects on the force and deformation capacity of RC columns, resulting in unexpected large deformations and extensive damage that in turn influences the performance of bridges as vital components of transportation systems. This paper evaluates the seismic response of three prototype reinforced concrete bridges using comprehensive numerical models that are capable of simulating the complex soil-structural interaction effects and nonlinear behavior of columns. An analytical approach that can capture the shearflexural interacting behavior is developed to model the realistic nonlinear behavior of RC columns, including the pinching behavior, strength deterioration and stiffness softening due to combined actions of
shear force, axial force and bending moment. Seismic response analyses were conducted on the prototype bridges under suites of ground motions. Response quantities of bridges (e.g., drift, acceleration, section
force and section moment etc.) are compared and evaluated to identify the effects of vertical motion, structural characteristics and the shear-flexural interaction on seismic demand of bridges.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001359362
|
oai_dc
|
Free vibration of laminated composite skew plates with central cutouts
|
Free vibration of laminated composite skew plates with central cutouts
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"이상열(중부대학교); 박대효(한양대학교)"
] |
We performed a free vibration analysis of skew composite laminates with or without cutout based on the high-order shear deformation plate theory (HSDT). The effects of skew angles and ply orientations on the natural frequencies for various boundary conditions are studied using a nonlinear highorder finite element program developed for this study. The numerical results are in good agreement with those reported by other investigators for simple test cases, and the new results reported in this paper show the interactions between the skew angle, layup sequence and cutout size on the free vibration of the laminate. The findings highlight the importance of skew angles when analyzing laminated composite skew plates with cutout or without cutout.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001359382
|
oai_dc
|
A stochastic optimal time-delay control for nonlinear structural systems
|
A stochastic optimal time-delay control for nonlinear structural systems
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Z. G. Ying(Zhejiang University); W. Q. Zhu(Zhejiang University)"
] |
The time delay in active and semi-active controls is an important research subject. Many researches on the time-delay control for deterministic systems have been made (Hu and Wang 2002, Yang et al. 1990, Abdel-Mooty and Roorda 1991, Pu 1998, Cai and Huang 2002), while the study on that for stochastic systems is very limited. The effects of the time delay on the control of nonlinear systems under Gaussian white noise excitations have been studied by Bilello et al. (2002). The controlled linear systems with deterministic and random time delay subjected to Gaussian white noise excitations have been treated by Grigoriu (1997). Recently, a stochastic averaging method for quasi-integrable Hamiltonian systems with time delay has been proposed (Liu and Zhu 2007). In the present paper, a stochastic optimal time-delay control method for stochastically excited nonlinear structural systems is proposed based on the stochastic averaging method for quasi Hamiltonian systems with time delay and the stochastic dynamical
programming principle. An example of stochastically excited and controlled hysteretic column is given to illustrate the proposed control method.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001359309
|
oai_dc
|
Periodic seismic performance evaluation of highway bridges using structural health monitoring system
|
Periodic seismic performance evaluation of highway bridges using structural health monitoring system
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"이진학(한국해양연구원); 김두기(군산대학교); Maria Q. Feng(University of California)"
] |
In this study, the periodic seismic performance evaluation scheme is proposed using a structural health monitoring system in terms of seismic fragility. An instrumented highway bridge is used to demonstrate the evaluation procedure involving (1) measuring ambient vibration of a bridge under general vehicle loadings, (2) identifying modal parameters from the measured acceleration data by applying output-only modal identification method, (3) updating a preliminary finite element model (obtained from structural design drawings) with the identified modal parameters using real-coded genetic algorithm, (4) analyzing nonlinear response time histories of the structure under earthquake excitations, and finally (5) developing fragility curves represented by a log-normal distribution function using
maximum likelihood estimation. It is found that the seismic fragility of a highway bridge can be updated using extracted modal parameters and can also be monitored further by utilizing the instrumented structural health monitoring system.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001359324
|
oai_dc
|
Flexural behavior of reinforced concrete beams strengthened with a hybrid inorganic matrix - steel fiber retrofit system
|
Flexural behavior of reinforced concrete beams strengthened with a hybrid inorganic matrix - steel fiber retrofit system
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Christos G. Papakonstantinou(University of Massachusetts Dartmouth); Konstantinos Katakalos(University of Massachusetts Dartmouth)"
] |
The aim of this study was to investigate the flexural behavior of reinforced concrete beams strengthened with a novel strengthening system. Concrete beams were strengthened with a hybrid retrofit system consisting of high strength steel cords impregnated in an inorganic fireproof matrix (Geopolymer). The strengthened reinforced concrete beams along with non-strengthened control beams were tested monotonically under four point bending loading conditions. Moreover, an analytical model is introduced, that can be used to analyze the flexural performance of the strengthened beams. The experimental results indicate that the failure of the strengthened beams was based on the yielding of the reinforcement in the tension face of the beams, followed by a local slippage of the steel cords. The flexural stiffness of the strengthened beams was significantly improved compared to the stiffness of the non-strengthened beams. In conclusion, the strengthening system can provide an effective alternative to commercially available systems.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001359187
|
oai_dc
|
Stochastic free vibration analysis of smart random composite plates
|
Stochastic free vibration analysis of smart random composite plates
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"B. N. Singh(Indian Institute of Technology Kharagpur); N. Vyas(Indian Institute of Technology Kharagpur); P. Dash(Indian Institute of Technology Kharagpur)"
] |
The present study is concerned with the stochastic linear free vibration study of laminated composite plate embedded with piezoelectric layers with random material properties. The system equations are derived using higher order shear deformation theory. The lamina material properties of the laminate are modeled as basic random variables for accurate prediction of the system behavior. A C0 finite element is used for spatial descretization of the laminate. First order Taylor series based mean centered perturbation technique in conjunction with finite element method is outlined for the problem. The outlined
probabilistic approach is used to obtain typical numerical results, i.e., the mean and standard deviation of natural frequency. Different combinations of simply supported, clamped and free boundary conditions are considered. The effect of side to thickness ratio, aspect ratio, lamination scheme on scattering of natural frequency is studied. The results are compared with those available in literature and an independent Monte Carlo simulation.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001359298
|
oai_dc
|
Structural evaluation of an existing steel natatorium by FEM and dynamic measurement
|
Structural evaluation of an existing steel natatorium by FEM and dynamic measurement
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Wei Liu(Harbin Institute of Technology); Wei-Cheng Gao(Harbin Institute of Technology); Yi Sun(Harbin Institute of Technology); Yan-Lei Yu(Harbin Institute of Technology)"
] |
Based on numerical and experimental methods, a systematic structural evaluation of a steel natatorium in service was carried out in detail in this paper. Planning of inspection tasks was proposed firstly according to some national codes in China in order to obtain the economic and reliable results. The field visual inspections and static computation were conducted in turn under in-service environmental conditions. Further a three-dimensional finite element model was developed according to its factual geometry properties obtained from the field inspection. An analytical modal analysis was performed to provide the analytical modal properties. The field vibration tests on the natatorium were conducted and then two different system identification methods were used to obtain the dynamic characteristics of the
natatorium. A good correlation was achieved in results obtained from the two system identification methods and the finite element method (FEM). The numerical and experimental results demonstrated that the main structure of the natatorium in its present status is safe and it still satisfies the demand of the national codes in China. But the roof system such as purlines and skeletons must be removed and rebuilt completely. Moreover the system identification results showed that field vibration test is sufficient to identify the reliable dynamic properties of the natatorium. The constructive suggestion on structural
evaluation of the natatorium is that periodic assessment work must be maintained to ensure the natatorium’s safety in the future.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001351464
|
oai_dc
|
Behaviour of a weir under earthquake loading
|
Behaviour of a weir under earthquake loading
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"M. M. G. V. Shyamalee(University of Peradeniya); C. K. Pathirana(University of Peradeniya); H. Abeyruwan(University of Peradeniya); K. R. B. Herath(University of Peradeniya)"
] |
토목공학
| null |
kci_detailed_000081.xml
|
||||
ART001660729
|
oai_dc
|
Mesoscopic study on historic masonry
|
Mesoscopic study on historic masonry
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"J. Šejnoha(CTU in Prague); J. Zeman(CTU in Prague); J. Sýkora(CTU in Prague); J. Vorel(CTU in Prague)"
] |
This paper presents a comprehensive approach to the evaluation of macroscopic material
parameters for natural stone and quarry masonry. To that end, a reliable non-linear material model on a
meso-scale is developed to cover the random arrangement of stone blocks and quasi-brittle behaviour of
both basic components, as well as the impaired cohesion and tensile strength on the interface between the
blocks and mortar joints. The paper thus interrelates the following three problems: (i) definition of a
suitable periodic unit cell (PUC) representing a particular masonry structure; (ii) derivation of material
parameters of individual constituents either experimentally or running a mixed numerical-experimental
problem; (iii) assessment of the macroscopic material parameters including the tensile and compressive
strengths and fracture energy
|
토목공학
| null |
http://dx.doi.org/
|
kci_detailed_000081.xml
|
||
ART001351478
|
oai_dc
|
The elastoplastic formulation of polygonal element method based on triangular finite meshes
|
The elastoplastic formulation of polygonal element method based on triangular finite meshes
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Yong-chang Cai(Tongji University); He-hua Zhu(Tongji University); Sheng-yong Guo(Ertan Hydropower Development Company, Ltd.,)"
] |
A small strain and elastoplastic formulation of Polygonal Element Method (PEM) is developed for efficient analysis of elastoplastic solids. In this work, the polygonal elements are constructed based on traditional triangular finite meshes. The construction method of polygonal mesh can directly utilize the sophisticated triangularization algorithm and reduce the difficulty in generating
polygonal elements. The Wachspress rational finite element basis function is used to construct the approximations of polygonal elements. The incremental variational form and a von Mises type model are used for non-linear elastoplastic analysis. Several small strain elastoplastic numerical examples are presented to verify the advantages and the accuracy of the numerical formulation.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001351436
|
oai_dc
|
On the limit cycles of aeroelastic systems with quadratic nonlinearities
|
On the limit cycles of aeroelastic systems with quadratic nonlinearities
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Y.M. Chen(SunYat-sen University); J.K. Liu(SunYat-sen University)"
] |
Limit cycle oscillations of a two-dimensional airfoil with quadratic and cubic pitching nonlinearities are investigated. The equivalent stiffness of the pitching stiffness is obtained by combining the linearization and harmonic balance method. With the equivalent stiffness, the equivalent linearization
method for nonlinear flutter analysis is generalized to address aeroelastic system with quadratic nonlinearity. Numerical example shows that good approximation of the limit cycle can be obtained by the generalized method. Furthermore, the proposed method is capable of revealing the unsymmetry of the limit cycle; however the ordinary equivalent linearization method fails to do so.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001351352
|
oai_dc
|
Passive, semi-active, and active tuned-liquid-column dampers
|
Passive, semi-active, and active tuned-liquid-column dampers
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Yung-Hsiang Chen(National Taiwan University); Ying-Jan Ding(Construction and Planning Agency)"
] |
The dynamic characteristics of the passive, semi-active, and active tuned-liquidcolumn dampers (or TLCDs) are studied in this paper. The design of the latter two are based on the first one. A water-head difference (or simply named as water head in this paper) of a passive TLCD is pre-set to form
the so-called semi-active one in this paper. The pre-set of water head is released at a proper time instant during an earthquake excitation in order to enhance the vibration reduction of a structure. Two propellers are installed along a shaft inside and at the center of a passive TLCD to form an active one. These two propellers are driven by a servo-motor controlled by a computer to provide the control force. The seismic responses of a five-story shear building with a passive, semiactive, and active TLCDs are computed for
demonstration and discussion. The responses of this building with a tuned mass damper (or TMD) are also included for comparison. The small-scale shaking-table experiments of a pendulum-like system with a passive or active TLCD to harmonic and seismic excitations are conducted for verification.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001351359
|
oai_dc
|
Response of a finite beam on a tensionless Pasternak foundation under symmetric and asymmetric loading
|
Response of a finite beam on a tensionless Pasternak foundation under symmetric and asymmetric loading
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Irfan Coskun(Yildiz Technical University); Hasan Engin(lstanbul Technical University); Ayd n Özmutlu(Trakya University)"
] |
The static response of a finite beam resting on a tensionless Pasternak foundation and subjected to a concentrated vertical load is assessed in this study. The concentrated vertical load may be applied at the center of the beam, or it may be offset from the center. The tensionless character of the
foundation results in the creation of lift-off regions between the beam and the foundation. An analytical/ numerical solution is obtained from the governing equations of the contact and lift-off regions to determine the extent of the contact region. Although there is no nonlinear term in the equations, the
problem shows a nonlinear character since the contact region is not known in advance. Due to that nonlinearity, the essentials of the problem (the coordinates of the lift-off points) are calculated numerically using the Newton-Raphson technique. The numerical results are presented in figures to illustrate the behaviours of the free-free and pinned-pinned beams under symmetric or asymmetric loading. The figures illustrate the effects of the shear foundation parameter and the symmetric and asymmetric loading options
on the variation of the contact lengths and the displacement of the beam.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001351524
|
oai_dc
|
Force transfer mechanisms for reliable design of reinforced concrete deep beams
|
Force transfer mechanisms for reliable design of reinforced concrete deep beams
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"박정웅(세종대학교); 김승억(세종대학교)"
] |
In this paper, a strut-and-tie model approach has been proposed to directly calculate the amount of reinforcements in deep beams, and the force transfer mechanisms for this approach were investigated using linear finite element analysis. The proposed strut-and-tie model provides quite similar force transfer mechanisms to the results of linear finite element analysis for the 28 deep beams. The loadcarrying capacities calculated from the proposed method are both accurate and conservative with little scatter or trends for the 214 deep beams. The deep beams have different concrete strengths including highstrength, various combinations of web reinforcements, and wide range of and a/d ratios. Good accuracy was also obtained using VecTor2, nonlinear finite element analysis tool based on the Modified Compression Field Theory. Since the proposed method provides a safe and reliable means for design of deep beams, this can serve to improve design provisions in future adjustments and development of design guidelines.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001350440
|
oai_dc
|
Natural frequencies of thin plates by means of the finite element method using a conditioned conforming quadrilateral element
|
Natural frequencies of thin plates by means of the finite element method using a conditioned conforming quadrilateral element
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"R.E. Rossi(Universidad Nacional del Sur)"
] |
토목공학
| null |
kci_detailed_000081.xml
|
||||
ART001350403
|
oai_dc
|
Modal-based model reduction and vibration control for uncertain piezoelectric flexible structures
|
Modal-based model reduction and vibration control for uncertain piezoelectric flexible structures
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Xu Yalan(Xidian University); Chen Jianjun(Xidian University)"
] |
In piezoelectric flexible structures, the contribution of vibration modes to the dynamic response of system may change with the location of piezoelectric actuator patches, which means that the ability of actuators to control vibration modes should be taken into account in the development of modal reduction model. The spatial H2 norm of modes, which serves as a measure of the intensity of modes to system dynamical response, is used to pick up the modes included in the reduction model. Based on the reduction model, the paper develops the state-space representation for uncertain flexible tructures with piezoelectric material as non-collocated actuators/sensors in the modal space, taking into account uncertainties due to modal parameters variation and unmodeled residual modes. In order to suppress the vibration of the structure, a dynamic output feedback control law is designed by imultaneously
considering the conflicting performance specifications, such as robust stability, transient response requirement, disturbance rejection, actuator saturation constraints. Based on linear matrix inequality, the vibration control design is converted into a linear convex optimization problem. The simulation results show how the influence of vibration modes on the dynamical response of structure varies with the location of piezoelectric actuators, why the uncertainties should be considered in the reductiom model to avoid exciting high-frequency modes in the non-collcated vibration control, and the possiblity that the conflicting performance specifications are dealt with simultaneously.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001350407
|
oai_dc
|
Estimation of active multiple tuned mass dampers for asymmetric structures
|
Estimation of active multiple tuned mass dampers for asymmetric structures
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Chunxiang Li(Shanghai University); Xueyu Xiong(Tongji University)"
] |
This paper proposes the application of active multiple tuned mass dampers (AMTMD) for translational and torsional response control of a simplified two-degree-of-freedom (2DOF) structure, able to represent the dynamic characteristics of general asymmetric structures, under the ground acceleration. This 2DOF structure is a generalized 2DOF system of an asymmetric structure with predominant translational and torsional responses under earthquake excitations using the mode reduced-order method.
Depending on the ratio of the torsional to the translational eigenfrequency, i.e. the torsional to translational frequency ratio (TTFR), of asymmetric structures, the following three cases can be distinguished: (1) torsionally flexible structures (TTFR < 1.0), (2) torsionally intermediate stiff structures
(TTFR = 1.0), and (3) torsionally stiff structures (TTFR > 1.0). The even distribution of the AMTMD within the whole width and half width of the asymmetric structure, thus leading to three cases of installing the AMTMD (referred to as the AMTMD of case 1, AMTMD of case 2, AMTMD of case 3,
respectively), is taken into account. In the present study, the criterion for searching the optimum parameters of the AMTMD is defined as the minimization of the minimum values of the maximum translational and torsional displacement dynamic magnification factors (DMF) of an asymmetric structure
with the AMTMD. The criterion used for assessing the effectiveness of the AMTMD is selected as the ratio of the minimization of the minimum values of the maximum translational and torsional displacement DMF of the asymmetric structure with the AMTMD to the maximum translational and torsional
displacement DMF of the asymmetric structure without the AMTMD. By resorting to these two criteria, a careful examination of the effects of the normalized eccentricity ratio (NER) on the effectiveness and robustness of the AMTMD are carried out in the mitigation of both the translational and torsional
responses of the asymmetric structure. Likewise, the effectiveness of a single ATMD with the optimum positions is presented and compared with that of the AMTMD.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001350353
|
oai_dc
|
Non-stochastic interval arithmetic-based finite element analysis for structural uncertainty response estimate
|
Non-stochastic interval arithmetic-based finite element analysis for structural uncertainty response estimate
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"이동규(Research Institute of Industrial Science & Technology); 박성수(부산대학교); 신수미(부산대학교)"
] |
Finite element methods have often been used for structural analyses of various mechanical problems. When finite element analyses are utilized to resolve mechanical systems, numerical uncertainties in the initial data such as structural parameters and loading conditions may result in uncertainties in the structural responses. Therefore the initial data have to be as accurate as possible in order to obtain reliable structural analysis results. The typical finite element method may not properly represent discrete systems
when using uncertain data, since all input data of material properties and applied loads are defined by nominal values. An interval finite element analysis, which uses the interval arithmetic as introduced by Moore (1966) is proposed as a non-stochastic method in this study and serves a new numerical tool for evaluating the uncertainties of the initial data in structural analyses. According to this method, the element stiffness matrix includes interval terms of the lower and upper bounds of the structural parameters, and
interval change functions are devised. Numerical uncertainties in the initial data are described as a tolerance error and tree graphs of uncertain data are constructed by numerical uncertainty combinations of each parameter. The structural responses calculated by all uncertainty cases can be easily estimated so that structural safety can be included in the design. Numerical applications of truss and frame structures demonstrate the efficiency of the present method with respect to numerical analyses of structural uncertainties.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001350428
|
oai_dc
|
Mechanics feasibility of using CFRP cables in super long-span cable-stayed bridges
|
Mechanics feasibility of using CFRP cables in super long-span cable-stayed bridges
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Xin-Jun Zhang(Zhejiang University of Technology)"
] |
To gain understanding of the applicability of CFRP cables in super long-span cable-stayed bridges, by taking a 1400 m cable-stayed bridge as example, mechanics performance including the static behavior under service load, dynamic behavior, wind stability and seismic behavior of the bridge using
either steel or CFRP cables are investigated numerically and compared. The results show that viewed from the aspect of mechanics performance, the use of CFRP cables in super long-span cable-stayed bridges is feasible, and the cross-sectional areas of CFRP cables should be determined by the principle of equivalent axial stiffness.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001350435
|
oai_dc
|
Double displacement coupled forced response for electromechanical integrated electrostatic harmonic drive
|
Double displacement coupled forced response for electromechanical integrated electrostatic harmonic drive
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Lizhong Xu(Yanshan University); Cuirong Zhu(Yanshan University); Lei Qin(Yanshan University)"
] |
In this paper, the double displacement coupled statics and dynamics of the electromechanical integrated electrostatic harmonic drive are developed. The linearization of the nonlinear dynamic equations is completed. Based on natural frequency and mode function, the double displacement coupled forced
response of the drive system to voltage excitation are obtained. Changes of the forced response along with the system parameters are investigated. The voltage excitation can cause the radial and tangent coupled forced responses of the flexible ring. The flexible ring radius, ring thickness and clearance between the ring and stator have obvious influences on the double displacement coupled forced responses.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001350425
|
oai_dc
|
Exact solution for asymmetric transient thermal and mechanical stresses in FGM hollow cylinders with heat source
|
Exact solution for asymmetric transient thermal and mechanical stresses in FGM hollow cylinders with heat source
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"M. Jabbari(Azad University); A.R. Vaghari(Azad University); A. Bahtui(Brunel University); M.R. Eslami(Amirkabir University of Technology)"
] |
Transient solution of asymmetric mechanical and thermal stresses for hollow cylinders made of functionally graded material is presented. Temperature distribution, as function of radial and circumferential directions and time, is analytically obtained, using the method of separation of variables
and generalized Bessel function. A direct method is used to solve the Navier equations, using the Euler equation and complex Fourier series.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001350415
|
oai_dc
|
On the natural frequencies and mode shapes of a multi-span and multi-step beam carrying a number of concentrated elements
|
On the natural frequencies and mode shapes of a multi-span and multi-step beam carrying a number of concentrated elements
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Hsien-Yuan Lin(Cheng Shiu University)"
] |
This paper adopts the numerical assembly method (NAM) to determine the exact solutions of natural frequencies and mode shapes of a multi-span and multi-step beam carrying a number of various concentrated elements including point masses, rotary inertias, linear springs, rotational springs and springmass
systems. First, the coefficient matrix for an intermediate station with various concentrated elements, cross-section change and/or pinned support and the ones for the left-end and right-end supports of a beam are derived. Next, the overall coefficient matrix for the entire beam is obtained using the numerical
assembly technique of the conventional finite element method (FEM). Finally, the exact solutions for the natural frequencies of the vibrating system are determined by equating the determinant of the last overall coefficient matrix to zero and the associated mode shapes are obtained by substituting the corresponding values of integration constants into the associated eigenfunctions.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001349591
|
oai_dc
|
Elastic buckling of perforated plates subjected to linearly varying in-plane loading
|
Elastic buckling of perforated plates subjected to linearly varying in-plane loading
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"M. Aydin Komur(Aksaray University); Mustafa Sonmez(Aksaray University)"
] |
토목공학
| null |
kci_detailed_000081.xml
|
||||
ART001349587
|
oai_dc
|
Design on a new oil well test shock absorber under impact load
|
Design on a new oil well test shock absorber under impact load
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Yuanxun Wang(Huazhong University of Science and Technology); Peng Zhang(Huazhong University of Science and Technology); Zhijian Cui(Huazhong University of Science and Technology); Chuanyao Chen(Huazhong University of Science and Technology)"
] |
Continuous operation of test and measurement is a new operating technique in the petroleum exploitation, which combines perforation with test and measurement effectively. In order to measure the original pressure of stratum layer exactly and prevent testing instrument from being impaired or damaged,
a suitable shock absorber is urgently necessary to research. Based on the attempt on the FEM analysis and experiment research, a new shock absorber is designed and discussed in this paper. 3D finite element model is established and simulated accurately by LS-DYNA, the effect and the dynamic character of the shock absorber impact by half sinusoidal pulse force under the main lobe frequency are discussed both on theoretics and experiment. It is shown that the new designed shock absorber system has good capability
of shock absorption for the impact load.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001349579
|
oai_dc
|
Cubic normal distribution and its significance in structural reliability
|
Cubic normal distribution and its significance in structural reliability
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Yan-Gang Zhao(Nagoya Institute of Technology); Zhao-Hui Lu(Nagoya Institute of Technology)"
] |
Information on the distribution of the basic random variable is essential for the accurate analysis of structural reliability. The usual method for determining the distributions is to fit a candidate distribution to the histogram of available statistical data of the variable and perform approximate goodness-of-fit tests. Generally, such candidate distribution would have parameters that may be evaluated from the statistical moments of the statistical data. In the present paper, a cubic normal distribution, whose parameters are determined using the first four moments of available sample data, is investigated. A parameter table based on the first four moments, which simplifies parameter estimation, is given. The simplicity, generality, flexibility and advantages of this distribution in statistical data analysis and its significance in structural reliability evaluation are discussed. Numerical examples are presented to
demonstrate these advantages.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001349582
|
oai_dc
|
Analytical model for high-strength concrete columns with square cross-section
|
Analytical model for high-strength concrete columns with square cross-section
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"G. Campione(Univ. di Palermo)"
] |
In the present paper a mechanical model to predict the compressive response of high strength short concrete columns with square cross-section confined by transverse steel is presented. The model allows one to estimate the equivalent confinement pressures exercised by transverse steel during the
loading process taking into account of the interaction of the stirrups with the inner core both in the plane of the stirrups and in the space between two successive stirrups. The lateral pressure distributions at hoop levels are obtained by using a simple model of elastic beam on elastic medium simulating the interaction between stirrups and concrete core, including yielding of steel stirrups and damage of concrete core by means of the variation in the elastic modulus and in the Poisson’s coefficient. Complete stress-strain curves in compression of confined concrete core are obtained considering the variation of the axial forces in the leg of the stirrup during the loading process. The model was compared with some others presented
in the literature and it was validated on the basis of the existing experimental data. Finally, it was shown that the model allows one to include the main parameters governing the confinement problems of high strength concrete members such as: - the strength of plain concrete and its brittleness; - the diameter, the pitch and the yielding stress of the stirrups; - the diameter and the yielding stress of longitudinal bars; - the side of the member, etc.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001349581
|
oai_dc
|
Spectral SFEM analysis of structures with stochastic parameters under stochastic excitation
|
Spectral SFEM analysis of structures with stochastic parameters under stochastic excitation
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"O.H. Galal(Fayoum University); W. El-Tahan(Cairo University); M.A. El-Tawil(Cairo University); A.A. Mahmoud(Cairo University)"
] |
In this paper, linear elastic isotropic structures under the effects of both stochastic operators and stochastic excitations are studied. The analysis utilizes the spectral stochastic finite elements (SSFEM) with its two main expansions namely; Neumann and Homogeneous Chaos expansions. The random excitation and the random operator fields are assumed to be second order stochastic processes. The formulations are obtained for the system solution of the two dimensional problems of plane strain and plate bending structures under stochastic loading and relevant rigidity using the previously mentioned expansions. Two finite element programs were developed to incorporate such formulations. Two illustrative examples are introduced: the first is a reinforced concrete culvert with stochastic rigidity subjected to a stochastic load where the culvert is modeled as plane strain problem. The second example is a simply supported square reinforced concrete slab subjected to out of plane loading in which the slab flexural rigidity and the applied load are considered stochastic. In each of the two examples, the first two statistical moments of displacement are evaluated using both expansions. The probability density function of the structure response of each problem is obtained using Homogeneous Chaos expansion.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001349584
|
oai_dc
|
Experimental study on seismic performance of coupling beams not designed for ductility
|
Experimental study on seismic performance of coupling beams not designed for ductility
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"S.S.E. Lam(The Hong Kong Polytechnic University); B. Wu(South China University of Technology); Z.Q. Liu(Harbin Institute of Technology); Y.L. Wong(The Hong Kong Polytechnic University)"
] |
Seismic performance of coupling beams not designed for ductility is examined. Eight 1:4 scale coupling beam specimens, with seven reinforced concrete sections and one composite section, were tested under cycles of push-pull action. Characteristics of the specimens include moderate shear span ratio in the range of 2.5-3.5, high main reinforcement ratio at 3-4% and small to large stirrup spacing with 90- degree hooks. All the reinforced concrete specimens failed in a brittle manner. Displacement ductility of
specimens with large stirrup spacing (≥140 mm) is in the range of 3 to 5. Seismic performance of the specimens is also examined using the ultimate drift angle and the amount of energy dissipated. Correlating the test data, an empirical relationship is proposed to estimate the ultimate drift angle of a
class of coupling beams considered in the study not designed for ductility.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001364114
|
oai_dc
|
Comparison of deck-anchored damper and clipped tuned mass damper on cable vibration reduction
|
Comparison of deck-anchored damper and clipped tuned mass damper on cable vibration reduction
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"W. J. Wu(Mustang Engineering); C. S. Cai(Louisiana State University)"
] |
Excessive cable vibrations are detrimental to cable-stayed bridges. Increasing the system damping of cables is a key solution to resolve this severe problem. Equations representing the dynamic characteristics of an inclined cable with a Deck-Anchored Damper (DAD) or with a Clipped Tuned Mass Dampers (CTMD) are reviewed. A theoretical comparison on the performance of cable vibration reduction between the cable-DAD system and the cable-CTMD systems is thoroughly discussed. Optimal system
modal damping for the free vibration and transfer functions for the forced vibration for the two cabledamper systems are addressed and compared in detail. Design examples for these two different dampers are also provided.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001364118
|
oai_dc
|
Analyses of tapered fgm beams with nonlocal theory
|
Analyses of tapered fgm beams with nonlocal theory
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"S. C. Pradhan(Indian Institute of Technology Kharagpur); A. Sarkar(Indian Institute of Technology Kharagpur)"
] |
In the present article bending, buckling and vibration analyses of tapered beams using Eringen non-local elasticity theory are being carried out. The associated governing differential equations are solved employing Rayleigh-Ritz method. Both Euler-Bernoulli and Timoshenko beam theories are
considered in the analyses. Present results are in good agreement with those reported in literature. Beam material is considered to be made up of functionally graded materials (fgms). Non-local analyses for tapered beam with simply supported - simply supported, clamped - simply supported and clamped - free
boundary conditions are carried out and discussed. Further, effect of length to height ratio on maximum
deflections, vibration frequencies and critical buckling loads are studied.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001364112
|
oai_dc
|
Comparison between ACI 318-05 and Eurocode 2 (EC2-94) in flexural concrete design
|
Comparison between ACI 318-05 and Eurocode 2 (EC2-94) in flexural concrete design
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Rami A. Hawileh(American University of Sharjah); Faris A. Malhas(University of Dayton); Adeeb Rahman(University of Wisconsin-Milwaukee)"
] |
The two major widely used building design code documents of reinforced concrete structures are the ACI 318-05 and Eurocode for the Design of Concrete Structures EC2. Therefore, a thorough comparative analysis of the provisions of these codes is required to confirm their validity and identify
discrepancies in either code. In this context, provisions of flexural computations would be particularly attractive for detailed comparison. The provisions of safety concepts, design assumptions, cross-sectional
moment capacity, ductility, minimum and maximum reinforcement ratios, and load safety factors of both the ACI 318-05 and EC2 is conducted with parametric analysis. In order to conduct the comparison successfully, the parameters and procedures of EC2 were reformatted and defined in terms of those of ACI 318-05. This paper concluded that although the adopted rationale and methodology of computing the design strength is significantly different between the two codes, the overall EC2 flexural provisions are slightly more conservative with a little of practical difference than those of ACI 318-05. In addition, for the limit of maximum reinforcement ratio, EC2 assures higher sectional ductility than ACI 318-05.
Overall, EC2 provisions provide a higher safety factor than those of ACI 318-05 for low values of Live/Dead load ratios. As the ratio increases the difference between the two codes decreases and becomes almost negligible for ratios higher than 4.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001364117
|
oai_dc
|
Experimental deployment and validation of a distributed SHM system using wireless sensor networks
|
Experimental deployment and validation of a distributed SHM system using wireless sensor networks
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Nestor E. Castaneda(Washington University); Shirley Dyke(Washington University); Chenyang Lu(Washington University); Fei Sun(Washington University); Greg Hackmann(Washington University)"
] |
Recent interest in the use of wireless sensor networks for structural health monitoring (SHM) is mainly due to their low implementation costs and potential to measure the responses of a structure at unprecedented spatial resolution. Approaches capable of detecting damage using distributed processing
must be developed in parallel with this technology to significantly reduce the power consumption and communication bandwidth requirements of the sensor platforms. In this investigation, a damage detection system based on a distributed processing approach is proposed and experimentally validated using a wireless sensor network deployed on two laboratory structures. In this distributed approach, on-board processing capabilities of the wireless sensor are exploited to significantly reduce the communication load
and power consumption. The Damage Location Assurance Criterion (DLAC) is used for localizing damage. Processing of the raw data is conducted at the sensor level, and a reduced data set is transmitted to the base station for decision-making. The results indicate that this distributed implementation can be used to successfully detect and localize regions of damage in a structure. To further support the experimental results obtained, the capabilities of the proposed system were tested through a series of numerical simulations with an expanded set of damage scenarios.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001364113
|
oai_dc
|
Estimation of modal correlation coefficients from background and resonant responses
|
Estimation of modal correlation coefficients from background and resonant responses
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"V. Denoël(University of Liège)"
] |
A new simple relation for the estimation of modal correlation coefficients is presented. It is obtained from the decomposition of covariances of modal responses into background and resonant contributions, as it is commonly done for the variances. Thanks to appropriate assumptions, the modal
correlation coefficients are estimated as weighted sums of two limit values, corresponding to the background and resonant responses respectively. The weighting coefficients are expressed as functions of the background-to-resonant ratios, which makes the proposed formulation convenient and easily accessible.
The simplicity of the mathematical formulation facilitates the physical interpretation. It is for example proved that modal correlation coefficients can be non negligable even in case of well separated natural frequencies, which is sometimes unclear in the litterature. The new relation is mainly efficient in case of large finite element models. It is applied and validated on a finite element buffeting analysis of the Viaduct of Millau, the highest bridge deck ever built so far.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001364116
|
oai_dc
|
Progressive collapse of reinforced concrete structures
|
Progressive collapse of reinforced concrete structures
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"O. Yagob(Concordia University); K. Galal(Concordia University); N. Naumoski(University of Ottawa)"
] |
In the past few decades, effects of natural hazards, such as earthquakes and wind, on existing structures have attracted the attention of researchers and designers. More recently, however, the phenomenon of progressive collapse is becoming more recognized in the field of structural engineering. In
practice, the phenomenon can result from a number of abnormal loading events, such as bomb explosions, car bombs, accidental fires, accidental blast loadings, natural hazards, faulty design and construction practices, and premeditated terrorist acts. Progressive collapse can result not only in disproportionate structural failure, but also disproportionate loss of life and injuries. This paper provides an up-to-date comprehensive review of this phenomenon and its momentousness in structural engineering communities.
The literature reveals that although the phenomenon of progressive collapse of buildings is receiving considerable attention in the professional engineering community, more research work is still needed in this field to develop a new methodology for efficient and inexpensive design to better protect buildings against progressive collapse.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001364115
|
oai_dc
|
A feasibility study on smart base isolation systems using magneto-rheological elastomers
|
A feasibility study on smart base isolation systems using magneto-rheological elastomers
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Jeong-Hoi Koo(Miami University); Dong-Doo Jang(KAIST); 정형조(한국과학기술원); Muhammad Usman(KAIST)"
] |
This study proposes a new smart base isolation system that employs Magneto-Rheological Elastomers (MREs), a class of smart materials whose elastic modulus or stiffness can be varied depending on the magnitude of an applied magnetic field. It also evaluates the dynamic performance of the MREbased isolation system in reducing vibrations in structures subject to various seismic excitations. As controllable stiffness elements, MREs can increase the dynamic control bandwidth of the isolation system, improving its vibration reduction capability. To study the effectiveness of the MRE-based isolation system, this paper compares its dynamic performance in reducing vibration responses of a base-isolated singlestory structure (i.e., 2DOF) with that of a conventional base-isolation system. Moreover, two control algorithms (linear quadratic regulator (LQR)-based control and state-switched control) are considered for regulating the stiffness of MREs. The simulation results show that the MRE-based isolation system outperformed the conventional system in suppressing the maximum base drift, acceleration, and displacement of the structure.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001358728
|
oai_dc
|
Approximation of reliability constraints by estimating quantile functions
|
Approximation of reliability constraints by estimating quantile functions
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Jianye Ching(National Taiwan University); Wei-Chi Hsu(National Taiwan University of Science and Technology)"
] |
A novel approach is proposed to effectively estimate the quantile functions of normalized performance indices of reliability constraints in a reliability-based optimization (RBO) problem. These quantile functions are not only estimated as functions of exceedance probabilities but also as functions of the design variables of the target RBO problem. Once these quantile functions are obtained, all reliability constraints in the target RBO problem can be transformed into non-probabilistic ordinary ones, and the RBO problem can be solved as if it is an ordinary optimization problem. Two numerical examples are
investigated to verify the proposed novel approach. The results show that the approach may be capable of finding approximate solutions that are close to the actual solution of the target RBO problem.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001358720
|
oai_dc
|
A neural network approach for simulating stationary stochastic processes
|
A neural network approach for simulating stationary stochastic processes
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Michael Beer(National University of Singapore); Pol D. Spanos(Rice University)"
] |
In this paper a procedure for Monte Carlo simulation of univariate stationary stochastic processes with the aid of neural networks is presented. Neural networks operate model-free and, thus, circumvent the need of specifying a priori statistical properties of the process, as needed traditionally. This is particularly advantageous when only limited data are available. A neural network can capture the “pattern” of a short observed time series. Afterwards, it can directly generate stochastic process realizations which capture the properties of the underlying data. In the present study a simple feedforward
network with focused time-memory is utilized. The proposed procedure is demonstrated by examples of Monte Carlo simulation, by synthesis of future values of an initially short single process record.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001358731
|
oai_dc
|
Stochastic value index for seismic risk management of existing lifelines
|
Stochastic value index for seismic risk management of existing lifelines
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Takeshi Koike(Tokyo City University); Toshio Imai(JFE Engineering Corporation)"
] |
This study proposes a certain measure or investment strategy for decision making associated with seismic retrofitting. This strategy reduces the risk of a large-scale malfunction such as water supply loss under seismic risks. The authors developed a stochastic value index that will be used in the overall evaluation of social benefit, income gain, life cycle costs and failure compensation associated with existing lifeline systems damaged by an earthquake during the remaining service period. Optimal seismic disaster prevention investment of deteriorated lifeline systems is discussed. Finally, the present study provides a performance-based design method for seismic retrofitting strategies of existing lifelines which are carried out using the target probabilities of value loss and structural failure.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001358779
|
oai_dc
|
Exact solution for forced torsional vibration of finite piezoelectric hollow cylinder
|
Exact solution for forced torsional vibration of finite piezoelectric hollow cylinder
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"H. M. Wang(Zhejiang University); C. B. Liu(Zhejiang University); H. J. Ding(Zhejiang University)"
] |
An exact solution is obtained for forced torsional vibration of a finite class 622 piezoelectric hollow cylinder with free-free ends subjected to dynamic shearing stress and time dependent electric potential at both internal and external surfaces. The solution is first expanded in axial direction with trigonometric series and the governing equations for the new variables about radial coordinate r and time t are derived with the aid of Fourier series expansion technique. By means of the superposition method and the separation of variables technique, the solution for torsional vibration is finally obtained. Natural frequencies and the transient torsional responses for finite class 622 piezoelectric hollow cylinder with free-free ends are computed and illustrated.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001358771
|
oai_dc
|
Earthquake response of isolated cable-stayed bridges under spatially varying ground motions
|
Earthquake response of isolated cable-stayed bridges under spatially varying ground motions
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Sevket Ates(Karadeniz Technical University); Kurtulus Soyluk(Gazi University); A. Aydin Dumanoglu(Karadeniz Technical University); Alemdar Bayraktar(Karadeniz Technical University)"
] |
A comprehensive investigation of the stochastic response of an isolated cable-stayed bridge subjected to spatially varying earthquake ground motion is performed. In this study, the Jindo Bridge built in South Korea is chosen as a numerical example. The bridge deck is assumed to be continuous from one end to the other end. The vertical movement of the stiffening girder is restrained and freedom of rotational movement on the transverse axis is provided for all piers and abutments. The longitudinal restraint is provided at the mainland pier. The A-frame towers are fixed at the base. To implement the
base isolation procedure, the double concave friction pendulum bearings are placed at each of the four support points of the deck. Thus, the deck of the cable-stayed bridge is isolated from the towers using the double concave friction pendulum bearings which are sliding devices that utilize two spherical concave surfaces. The spatially varying earthquake ground motion is characterized by the incoherence and wavepassage effects. Mean of maximum response values obtained from the spatially varying earthquake ground motion case are compared for the isolated and non-isolated bridge models. It is pointed out that the base isolation of the considered cable-stayed bridge model subjected to the spatially varying earthquake ground motion significantly underestimates the deck and the tower responses.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001358757
|
oai_dc
|
Large deflection analysis of orthotropic, elliptic membranes
|
Large deflection analysis of orthotropic, elliptic membranes
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Somchai Chucheepsakul(King Mongkut’s University of Technology Thonburi); Sakdirat Kaewunruen(RailCorp - Track Engineering); Apiwat Suwanarat(King Mongkut’s University of Technology Thonburi)"
] |
Applications of membrane mechanisms are widely found in nano-devices and nano-sensor technologies nowadays. An alternative approach for large deflection analysis of the orthotropic, elliptic membranes . subject to gravitational, uniform pressures often found in nano-sensors . is described in this paper. The material properties of membranes are assumed to be orthogonally isotropic and linearly elastic, while the principal directions of elasticity are parallel to the coordinate axes. Formulating the potential energy functional of the orthotropic, elliptic membranes involves the strain energy that is attributed to inplane stress resultant and the potential energy due to applied pressures. In the solution method, Rayleigh-Ritz method can be used successfully to minimize the resulting total potential energy generated. The set
of equilibrium equations was solved subsequently by Newton-Raphson. The unparalleled model formulation capable of analyzing the large deflections of both circular and elliptic membranes is verified by making numerical comparisons with existing results of circular membranes as well as finite element solutions. The results are found in excellent agreements at all cases. Then, the parametric investigations are given to delineate the impacts of the aspect ratios and orthotropic elasticity on large static tensions and deformations of the orthotropic, elliptic membranes.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001359109
|
oai_dc
|
Stresses around an underground opening with sharp corners due to non-symmetrical surface load
|
Stresses around an underground opening with sharp corners due to non-symmetrical surface load
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Karinski Y.S.(National Building Research Institute); Yankelevsky D.Z(National Building Research Institute); Antes M.Y.(National Building Research Institute)"
] |
The paper aims at analyzing the stress distribution around an underground opening that is subjected to non-symmetrical surface loading with emphasis on opening shapes with sharp corners and the stress concentrations developed at these locations. The analysis is performed utilizing the BIE method coupled with the Neumann’s series. In order to implement this approach, the special recurrent relations for half plane were proven and the modified Shanks transform was incorporated to accelerate the series convergence. To demonstrate the capability of the developed approach, a horseshoe shape opening with sharp corners was investigated and the location and magnitude of the maximum hoop stress was calculated. The dependence of the maximum hoop stress location on the parameters of the surface loading (degree of asymmetry, size of loaded area) and of the opening (the opening height) was studied. It was found that the absolute magnitude of the maximum hoop stress (for all possible surface loading locations) is developed at the roof points when the opening height/width ratio is relatively large or when the pressure loading area is relatively narrow (compared to the roof arch radius), and contrarily, when the opening height/width ratio is relatively small or when the surface pressure is applied to a relatively wide area, the absolute magnitude of the maximum hoop stress is developed at the bottom sharp corner points.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001358726
|
oai_dc
|
Parallel processing in structural reliability
|
Parallel processing in structural reliability
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"M.F. Pellissetti(University of Innsbruck)"
] |
The present contribution addresses the parallelization of advanced simulation methods for structural reliability analysis, which have recently been eveloped for large-scale structures with a high number of uncertain parameters. In particular, the Line Sampling method and the Subset Simulation method are considered. The proposed parallel algorithms exploit the parallelism associated with the possibility to simultaneously perform independent FE analyses. For the Line Sampling method a parallelization scheme is proposed both for the actual sampling process, and for the statistical gradient
estimation method used to identify the so-called important direction of the Line Sampling scheme. Two parallelization strategies are investigated for the Subset Simulation method: the first one consists in the embarrassingly parallel advancement of distinct Markov chains; in this case the speedup is bounded by the number of chains advanced simultaneously. The second parallel Subset Simulation algorithm utilizes the concept of speculative computing. Speedup measurements in context with the FE model of a multistory building (24,000 DOFs) show the reduction of the wall-clock time to a very viable amount (<10 minutes for Line Sampling and . 1 hour for Subset Simulation). The measurements, conducted on clusters of multi-core nodes, also indicate a strong sensitivity of the parallel performance to the load level of the
nodes, in terms of the number of simultaneously used cores. This performance degradation is related to memory bottlenecks during the modal analysis required during each FE analysis.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001358742
|
oai_dc
|
Stochastic response spectra for an actively-controlled structure
|
Stochastic response spectra for an actively-controlled structure
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Takashi Mochio(Kinki University)"
] |
A stochastic response spectrum method is proposed for simple evaluation of the structural response of an actively controlled aseismic structure. The response spectrum is constructed assuming a linear structure with an active mass damper (AMD) system, and an earthquake wave model given by the product of a non-stationary envelope function and a stationary Gaussian random process with Kanai-Tajimi power spectral density. The control design is executed using a linear quadratic Gaussian control strategy for an enlarged state space system, and the response amplification factor is given by the
combination of the obtained statistical response values and extreme value theory. The response spectrum thus produced can be used for simple dynamical analyses. The response factors obtained by this method
for a multi-degree-of-freedom structure are shown to be comparable with those determined by numerical simulations, demonstrating the validity and utility of the proposed technique as a simple design tool. This
method is expected to be useful for engineers in the initial design stage for structures with active aseismic control.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001358223
|
oai_dc
|
Stochastic control approach to reliability of elasto-plastic structures
|
Stochastic control approach to reliability of elasto-plastic structures
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Siu-Kui Au(City University of Hong Kong)"
] |
An importance sampling method is presented for computing the first passage probability of elasto-plastic structures under stochastic excitations. The importance sampling distribution corresponds to shifting the mean of the excitation to an ‘adapted’ stochastic process whose future is determined based on information only up to the present. A stochastic control approach is adopted for designing the adapted process. The optimal control law is determined by a control potential, which satisfies the Bellman’s equation, a nonlinear partial differential equation on the response state-space. Numerical results for a single-degree-of freedom elasto-plastic structure shows that the proposed method leads to significant improvement in variance reduction over importance sampling using design points reported recently.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001358659
|
oai_dc
|
Structural reliability estimation based on quasi ideal importance sampling simulation
|
Structural reliability estimation based on quasi ideal importance sampling simulation
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Masaaki Yonezawa(Kinki University); Shoya Okuda(Kinki University Technical College); Hiroaki Kobayashi(Kinki University)"
] |
A quasi ideal importance sampling simulation method combined in the conditional expectation is proposed for the structural reliability estimation. The quasi ideal importance sampling joint probability density function (p.d.f.) is so composed on the basis of the ideal importance sampling concept as to be proportional to the conditional failure probability multiplied by the p.d.f. of the sampling
variables. The respective marginal p.d.f.s of the ideal importance sampling joint p.d.f. are determined numerically by the simulations and partly by the piecewise integrations. The quasi ideal importance
sampling simulations combined in the conditional expectation are executed to estimate the failure probabilities of structures with multiple failure surfaces and it is shown that the proposed method gives
accurate estimations efficiently.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001358569
|
oai_dc
|
Reliability analysis of wind-excited structures using domain decomposition method and line sampling
|
Reliability analysis of wind-excited structures using domain decomposition method and line sampling
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"L.S. Katafygiotis(Hong Kong University of Science and Technology); Jia Wang(Hong Kong University of Science and Technology)"
] |
In this paper the problem of calculating the probability that the responses of a wind-excited structure exceed specified thresholds within a given time interval is considered. The failure domain of the problem can be expressed as a union of elementary failure domains whose boundaries are of quadratic form. The Domain Decomposition Method (DDM) is employed, after being appropriately extended, to solve this problem. The probability estimate of the overall failure domain is given by the sum of the probabilities of the elementary failure domains multiplied by a reduction factor accounting for the
overlapping degree of the different elementary failure domains. The DDM is extended with the help of Line Sampling (LS), from its original presentation where the boundary of the elementary failure domains are of linear form, to the current case involving quadratic elementary failure domains. An example involving an along-wind excited steel building shows the accuracy and efficiency of the proposed methodology as compared with that obtained using standard Monte Carlo simulations (MCS).
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001358221
|
oai_dc
|
Efficient Monte Carlo simulation procedures in structural uncertainty and reliability analysis - recent advances
|
Efficient Monte Carlo simulation procedures in structural uncertainty and reliability analysis - recent advances
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"G.I. Schueller(University of Innsbruck)"
] |
The present contribution addresses uncertainty quantification and uncertainty propagation in structural mechanics using stochastic analysis. Presently available procedures to describe uncertainties in load and resistance within a suitable mathematical framework are shortly addressed. Monte Carlo methods are proposed for studying the variability in the structural properties and for their propagation to the response. The general applicability and versatility of Monte Carlo Simulation is demonstrated in the context with computational models that have been developed for deterministic structural analysis. After
discussing Direct Monte Carlo Simulation for the assessment of the response variability, some recently developed advanced Monte Carlo methods applied for reliability assessment are described, such as Importance Sampling for linear uncertain structures subjected to Gaussian loading, Line Sampling in linear dynamics and Subset simulation. The numerical example demonstrates the applicability of Line Sampling to general linear uncertain FE systems under Gaussian distributed excitation.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001358737
|
oai_dc
|
Probabilistic analysis of buckling loads of structures via extended Koiter law
|
Probabilistic analysis of buckling loads of structures via extended Koiter law
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Kiyohiro Ikeda(Tohoku University); Makoto Ohsaki(Kyoto University); Kentaro Sudo(Tohoku University); Toshiyuki Kitada(Osaka City University)"
] |
Initial imperfections, such as initial deflection or remaining stress, cause deterioration of buckling strength of structures. The Koiter imperfection sensitivity law has been extended to describe the mechanism of reduction for structures. The extension is twofold: (1) a number of imperfections are considered, and (2) the second order (minor) imperfections are implemented, in addition to the first order (major) imperfections considered in the Koiter law. Yet, in reality, the variation of external loads is dominant over that of imperfection. In this research, probabilistic evaluation of buckling loads against external loads subjected to probabilistic variation is conducted by extending the concept of imperfection sensitivity. A truss arch subjected to dead and live loads is considered as a numerical example. The
mechanism of probabilistic variation of buckling strength of this arch is described by the proposed method, and its reliability is evaluated.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001470892
|
oai_dc
|
Static analysis of shear-deformable shells of revolution via G.D.Q. method
|
Static analysis of shear-deformable shells of revolution via G.D.Q. method
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Edoardo Artioli(University of Bologna); Erasmo Viola(University of Bologna)"
] |
This paper deals with a novel application of the Generalized Differential Quadrature (G.D.Q.) method to the linear elastic static analysis of isotropic rotational shells. The governing equations of equilibrium, in terms of stress resultants and couples, are those from Reissner-Mindlin shear deformation
shell theory. These equations, written in terms of internal-resultants circular harmonic amplitudes, are first put into generalized displacements form, by use of the strain-displacements relationships and the constitutive equations. The resulting systems are solved by means of the G.D.Q. technique with
favourable precision, leading to accurate stress patterns.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001470891
|
oai_dc
|
Transient wave propagation in piezoelectric hollow spheres subjected to thermal shock and electric excitation
|
Transient wave propagation in piezoelectric hollow spheres subjected to thermal shock and electric excitation
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"H. L. Dai(Shanghai Jiao Tong University); X. Wang(Shanghai Jiao Tong University)"
] |
An analytical method is presented to solve the problem of transient wave propagation in a transversely isotropic piezoelectric hollow sphere subjected to thermal shock and electric excitation. Exact expressions for the transient responses of displacements, stresses, electric displacement and electric
potentials in the piezoelectric hollow sphere are obtained by means of Hankel transform, Laplace transform, and inverse transforms. Using Hermite non-linear interpolation method solves Volterra integral equation of the second kind involved in the exact expression, which is caused by interaction between
thermo-elastic field and thermo-electric field. Thus, an analytical solution for the problem of transient wave propagation in a transversely isotropic piezoelectric hollow sphere is obtained. Finally, some numerical results are carried out, and may be used as a reference to solve other transient coupled
problems of thermo-electro-elasticity.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001470889
|
oai_dc
|
Large deflections of variable-arc-length beams under uniform self weight: Analytical and experimental
|
Large deflections of variable-arc-length beams under uniform self weight: Analytical and experimental
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Tawich Pulngern(King Mongkut’s University of Technology Thonburi); Marvin W. Halling(Utah State University); Somchai Chucheepsakul(King Mongkut’s University of Technology Thonburi)"
] |
This paper presents the solution of large static deflection due to uniformly distributed self weight and the critical or maximum applied uniform loading that a simply supported beam with variablearc-length can resist. Two analytical approaches are presented and validated experimentally. The first approach is a finite-element discretization of the span length based on the variational formulation, which gives the solution of large static sag deflections for the stable equilibrium case. The second approach is the shooting method based on an elastica theory formulation. This method gives the results of the stable
and unstable equilibrium configurations, and the critical uniform loading. Experimental studies were conducted to complement the analytical results for the stable equilibrium case. The measured large static configurations are found to be in good agreement with the two analytical approaches, and the critical uniform self weight obtained experimentally also shows good correlation with the shooting method.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001470886
|
oai_dc
|
Strut-and-tie model of deep beams with web openings - An optimization approach
|
Strut-and-tie model of deep beams with web openings - An optimization approach
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Hong Guan(Griffith University Gold Coast Campus)"
] |
Reinforced concrete deep beams have useful applications in tall buildings and foundations. Over the past two decades, numerous design models for deep beams were suggested. However even the latest design manuals still offer little insight into the design of deep beams in particular when
complexities exist in the beams like web openings. A method commonly suggested for the design of deep beams with openings is the strut-and-tie model which is primarily used to represent the actual load transfer mechanism in a structural concrete member under ultimate load. In the present study, the
development of the strut-and-tie model is transformed to the topology optimization problem of continuum structures. During the optimization process, both the stress and displacement constraints are satisfied and the performance of progressive topologies is evaluated. The influences on the strut-and-tie model in relation to different size, location and number of openings, as well as different loading and support conditions in deep beams are examined in some detail. In all, eleven deep beams with web openings are
optimized and compared in nine groups. The optimal strut-and-tie models achieved are also compared with published experimental crack patterns. Numerical results have shown to confirm the experimental observations and to efficiently represent the load transfer mechanism in concrete deep beams with
openings under ultimate load.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001470888
|
oai_dc
|
The elastic deflection and ultimate bearing capacity of cracked eccentric thin-walled columns
|
The elastic deflection and ultimate bearing capacity of cracked eccentric thin-walled columns
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"L. Zhou(Xi’an University of Architecture Technology); Y. Huang(Wuyi University)"
] |
The influence of cracks on the elastic deflection and ultimate bearing capacity of eccentric thin-walled columns with both ends pinned was studied in this paper. First, a method was developed and applied to determine the elastic deflection of the eccentric thin-walled columns containing some model-I
cracks. A trigonometric series solution of the elastic deflection equation was obtained by the Rayleigh-Ritz energy method. Compared with the solution presented in Okamura (1981), this solution meets the needs of compatibility of deformation and is useful for thin-walled columns. Second, a two-criteria
approach to determine the stability factor ϕ has been suggested and its analytical formula has been derived. Finally, as an example, box columns with a center through-wall crack were analyzed and calculated. The effects of cracks on both the maximum deflection and the stability coefficient ϕ for
various crack lengths or eccentricities were illustrated and discussed. The analytical and numerical results of tests on the columns show that the deflection increment caused by the cracks increases with increased
crack length or eccentricity, and the critical transition crack length from yielding failure to fracture failure ξc is found to decrease with an increase of the slenderness ratio or eccentricity.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001470887
|
oai_dc
|
Piecewise exact solution for analysis of base-isolated structures under earthquakes
|
Piecewise exact solution for analysis of base-isolated structures under earthquakes
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"C. S. Tsai(Feng Chia University); Tsu-Cheng Chiang(Feng Chia University); Bo-Jen Chen(Earthquake Proof System, Inc); Kuei-Chi Chen(Feng Chia University)"
] |
Base isolation technologies have been proven to be very efficient in protecting structures from seismic hazards during experimental and theoretical studies. In recent years, there have been more and more engineering applications using base isolators to upgrade the seismic resistibility of structures. Optimum design of the base isolator can lessen the undesirable seismic hazard with the most efficiency. Hence, tracing the nonlinear behavior of the base isolator with good accuracy is important in the
engineering profession. In order to predict the nonlinear behavior of base isolated structures precisely, hundreds even thousands of degrees-of-freedom and iterative algorithm are required for nonlinear time history analysis. In view of this, a simple and feasible exact formulation without any iteration has been proposed in this study to calculate the seismic responses of structures with base isolators. Comparison between the experimental results from shaking table tests conducted at National Center for Research on
Earthquake Engineering in Taiwan and the analytical results show that the proposed method can accurately simulate the seismic behavior of base isolated structures with elastomeric bearings. Furthermore, it is also shown that the proposed method can predict the nonlinear behavior of the VCFPS
isolated structure with accuracy as compared to that from the nonlinear finite element program. Therefore, the proposed concept can be used as a simple and practical tool for engineering professions for designing the elastomeric bearing as well as sliding bearing.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001470890
|
oai_dc
|
Investigation of the behavior of a crack between two half-planes of functionally graded materials by using the Schmidt method
|
Investigation of the behavior of a crack between two half-planes of functionally graded materials by using the Schmidt method
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Zhen-Gong Zhou(Harbin Institute of Technology); Biao Wang(Harbin Institute of Technology); Lin-Zhi Wu(Harbin Institute of Technology)"
] |
In this paper, the behavior of a crack between two half-planes of functionally graded materials subjected to arbitrary tractions is resolved using a somewhat different approach, named the Schmidt method. To make the analysis tractable, it is assumed that the Poisson’s ratios of the mediums
are constants and the shear modulus vary exponentially with coordinate parallel to the crack. By use of the Fourier transform, the problem can be solved with the help of two pairs of dual integral equations in which the unknown variables are the jumps of the displacements across the crack surfaces. To solve the dual integral equations, the jumps of the displacements across the crack surfaces are expanded in a series
of Jacobi polynomials. This process is quite different from those adopted in previous works. Numerical examples are provided to show the effect of the crack length and the parameters describing the functionally graded materials upon the stress intensity factor of the crack. It can be shown that the results
of the present paper are the same as ones of the same problem that was solved by the singular integral equation method. As a special case, when the material properties are not continuous through the crack line, an approximate solution of the interface crack problem is also given under the assumption that the effect of the crack surface interference very near the crack tips is negligible. It is found that the stress singularities of the present interface crack solution are the same as ones of the ordinary crack in homogenous materials.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001470896
|
oai_dc
|
Damage assessment of structures from changes in natural frequencies using genetic algorithm
|
Damage assessment of structures from changes in natural frequencies using genetic algorithm
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Damodar Maity(Indian Institute of Technology); Rashmi Ranjan Tripathy(Indian Institute of Technology)"
] |
A method is presented to detect and assess the structural damage from changes in natural frequencies using Genetic Algorithm (GA). Using the natural frequencies of the structure, it is possible to formulate the inverse problem in optimization terms and then to utilize a solution procedure employing GA to assess the damages. The technique has been applied to a cantilever beam and a plane frame, each one with different damage scenario to study the efficiency of the developed algorithm. A 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 way. The outcomes show that this method can detect and estimate the amount of damages with satisfactory precision.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001470898
|
oai_dc
|
Stability of a cylindrical shell with an oblique end
|
Stability of a cylindrical shell with an oblique end
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"X. J. Hu(University of Ottawa); D. Redekop(University of Ottawa)"
] |
The linearized buckling problem is considered for an isotropic clamped-clamped cylindrical shell with an oblique end. A theoretical solution based on the Budiansky shell theory is developed, and numerical results are determined using the differential quadrature method. In formulating the solutions, the surface of the shell is developed onto a plane, and the resulting irregular domain is then mapped, using blending functions, onto a square parent domain. The analysis is carried out in the parent domain.
Convergence, validation, and parametric studies are conducted for a uniform external pressure loading. Results determined are compared with finite element results. The paper ends with an appropriate set of conclusions.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001470908
|
oai_dc
|
Exact dynamic element stiffness matrix of shear deformable non-symmetric curved beams subjected to initial axial force
|
Exact dynamic element stiffness matrix of shear deformable non-symmetric curved beams subjected to initial axial force
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Nam-Il, Kim(Sungkyunkwan University); Moon-Young, Kim(Sungkyunkwan University)"
] |
For the spatially coupled free vibration analysis of shear deformable thin-walled nonsymmetric curved beam subjected to initial axial force, an exact dynamic element stiffness matrix of curved beam is evaluated. Firstly equations of motion and force-deformation relations are rigorously derived from the total potential energy for a curved beam element. Next a system of linear algebraic equations are constructed by introducing 14 displacement parameters and transforming the second order simultaneous differential equations into the first order simultaneous differential equations. And then explicit expressions for displacement parameters are numerically evaluated via eigensolutions and the exact 14 × 14 dynamic element stiffness matrix is determined using force-deformation relations. To demonstrate the accuracy and the reliability of this study, the spatially coupled natural frequencies of shear deformable thin-walled non-symmetric curved beams subjected to initial axial forces are evaluated and compared with analytical and FE solutions using isoparametric and Hermitian curved beam elements and results by ABAQUS’s shell elements.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001470913
|
oai_dc
|
Seismic qualification using the updated finite element model of structures
|
Seismic qualification using the updated finite element model of structures
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Jyoti K. Sinha(Bhabha Atomic Research Centre); A. Rama Rao(Bhabha Atomic Research Centre); R. K. Sinha(Bhabha Atomic Research Centre)"
] |
The standard practice is to seismically qualify the safety related equipment and structural components used in the nuclear power plants. Among several qualification approaches the qualification by the analysis using finite element (FE) method is the most common approach used in practice. However
the predictions by the FE model for a structure is known to show significant deviations from the dynamic behaviour of ‘as installed’ structure in many cases. Considering such limitation, few researchers have advocated re-qualification of such structures after installation at site to enhance the confidence in qualification vis-à-vis plant safety. For such an exercise the validation of FE model with experimental modal data is important. A validated FE model can be obtained by the Model Updating methods in conjugation with the in-situ experimental modal data. Such a model can then be used for qualification. Seismic analysis using the updated FE model and its advantage has been presented through an example of an in-core component − a perforated horizontal tube of a nuclear reactor.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001470915
|
oai_dc
|
Suboptimal control strategy in structural control implementation
|
Suboptimal control strategy in structural control implementation
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"J. Y. Xu(Wuhan University of Technology); Q. S. Li(City University of Hong Kong); G. Q. Li(Wuhan University of Technology); J. R. Wu(City University of Hong Kong); J. Tang(City University of Hong Kong)"
] |
The suboptimal control rule is introduced in structural control implementation as an alternative over the optimal control because the optimal control may require large amount of processing time when applied to complex structural control problems. It is well known that any time delay in structural control implementation will cause un-synchronized application of the control forces, which not only reduce the effectiveness of an active control system, but also cause instability of the control system. The effect of time delay on the displacement and acceleration responses of building structures is studied
when the suboptimal control rule is adopted. Two examples are given to show the effectiveness of the suboptimal control rule. It is shown through the examples that the present method is easy in implementation and high in efficiency and it can significantly reduce the time delay in structural control
implementation without significant loss of performance.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001470894
|
oai_dc
|
Limit load equations for partially restrained RC slabs
|
Limit load equations for partially restrained RC slabs
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"O. O. Olufemi(University of Aberdeen); K. L. Cheung(University of Aberdeen); K. M. A. Hossain(Ryerson University)"
] |
The expertise required in the judicious use of nonlinear finite element (FE) packages for design-assistance purposes is not widely available to the average engineer, whose sole aim may be to obtain an estimate for a single design parameter, such as the limit load capacity of a structure. Such a
parameter may be required for the design of a proposed reinforced concrete (RC) floor slab or bridge deck with a given set of geometrical and material details. This paper outlines a procedure for developing design-assistance equations for carrying out such predictions for partially restrained RC slabs under uniformly distributed loading condition, based on a database of FE results previously generated from a large number of ‘numerical model’ slabs. The developed equations have been used for predicting the peak loads of a number of experimental RC slabs having varying degrees of edge restraints; with results showing a reasonable degree of accuracy and low level of scatter. The simplicity of the equations makes them attractive and their successful use in the field of application reported in this paper suggest that the outlined procedure may also be extended to other classes of concrete structures.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001470899
|
oai_dc
|
Buckling lengths of unbraced multi-storey frame columns
|
Buckling lengths of unbraced multi-storey frame columns
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Günay Özmen(Istanbul Technical University); Konuralp Girgin(Istanbul Technical University)"
] |
In several design codes and specifications, simplified formulae and diagrams are given for determining the buckling lengths of frame columns. It is shown that these formulae may yield rather erroneous results in certain cases. This is due to the fact that, the code formulae utilise only local stiffness
distributions. In this paper, a simplified procedure for determining approximate values for the buckling loads of multi-storey frames is developed. The procedure utilises lateral load analysis of frames and yields errors in the order of 10%, which may be considered suitable for design purposes. The proposed procedure is applied to several numerical examples and it is shown that all the errors are in the acceptable range and on the safe side.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001115395
|
oai_dc
|
Tensile response of steel/CFRP adhesive bonds for the rehabilitation of civil structures
|
Tensile response of steel/CFRP adhesive bonds for the rehabilitation of civil structures
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"F. Matta(University of Padua); Vistasp M. Karbhari(University of California San Diego); Renato Vitaliani？(University of Padua)"
] |
There is a growing need for the development and implementation of new methods for therelated to welding and/or bolting in the field. Carbon fiber reinforced polymer (CFRP) composites providea potential alternative as externally bonded patches for strengthening and repair of metallic structuralmembers for building and bridge systems. This paper describes results of an investigation of tensile andthat appropriately designed schemes, even when fabricated with levels of inaccuracy as could be expectedin the field, can provide significant strain relief and load transfer capability. A simplified elasto-plasticbond development length remains constant in the linear range, whereas it increases as the adhesive isdeformed plastically. Fatigue resistance is shown to be at least comparable with the requirements forwelded cover plates without attendant decreases in stiffness and strength.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001115394
|
oai_dc
|
Nonlinear analysis of interaction between flexible pile group and soil
|
Nonlinear analysis of interaction between flexible pile group and soil
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Jie Liu(Hunan University); Q. S. Li(City University of Hong Kong); Zhe Wu(Beijing University of Aeronautics and Astronautics)"
] |
Using the nonlinear load transfer function for pile side soil and the linear load transferapproximate diferential equation solution method is presented for the nonlinear analysis of interactionbetween flexible pile group and soil. The proposed method provides an effective approach for the solutionverify the accuracy of the proposed method, a static load test for a ninepile group under a rigid platformis carried out. The finite element analysis is also conducted for comparison purposes. It is found that theresults from the proposed method match very well with those from the experimental test and are better in comparison with the finite element method.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001115351
|
oai_dc
|
Tuned liquid column dampers with adaptive tuning capacity for structural vibration control
|
Tuned liquid column dampers with adaptive tuning capacity for structural vibration control
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"K. M. Shum(Hong Kong Polytechnic University); Y. L. Xu(Hong Kong Polytechnic University)"
] |
The natural frequencies of a long span bridge vary during its construction and it is thusdificult to apply traditional tuned liquid column dampers (TLCD) with a fixed configuration to reducebridge vibration. The restriction of TLCD imposed by frequency tuning requirement also make it difficultcolumn damper (SATLCD), whose natural frequency can be altered by active control of liquid columnpressure, is studied in this paper. The principle of SATLCD with adaptive tuning capacity is firstintroduced. The analytical models are then developed for lateral vibration of a structure with SATLCDand torsional vibration of a structure with SATLCD, respectively, under either harmonic or white noisetechnique. Extensive parametric studies are finally carried out in the frequency domain to find thebeneficial parameters by which the maximum vibration reduction can be achieved. The key parametersinvestigated include the distance from the centre line of SATLCD to the rotational axis of a structure, theratio of horizontal length to the total length of liquid column, head loss coefficient, and frequency offsetpractice and achieve a high degree of vibration reduction. The sensitivity of SATLCD to the frequencyoffset between the damper and structure can be improved by adapting its frequency precisely to themeasured structural frequency.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001115352
|
oai_dc
|
Transient thermal stresses of orthotropic functionally graded thick strip due to nonuniform heat supply
|
Transient thermal stresses of orthotropic functionally graded thick strip due to nonuniform heat supply
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Yoshihiro Ootao(Osaka Prefecture University); Yoshinobu Tanigawa(Osaka Prefecture University)"
] |
This paper is concerned with the theoretical treatment of transient thermal stresses involvingan orthotropic functionally graded thick strip due to nonuniform heat supply in the width direction. Thethermal and thermoelastic constants of the strip are assumed to possess orthotropy and vary exponentiallyLaplace and finite sine transformations. We obtain the exact solution for the simply supported strip underthe state of plane strain. Some numerical results for the temperature change, the displacement and thestress distributions are shown in figures. Furthermore, the influence of the orthotropy and nonhomogeneityof the material is investigated.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001115349
|
oai_dc
|
Inter-story pounding between multistory reinforced concrete structures
|
Inter-story pounding between multistory reinforced concrete structures
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Chris G. Karayannis(Democritus University of Thrace); Maria J. Favvata(Democritus University of Thrace)"
] |
The influence of the inter-story structural pounding on the seismic behaviour of adjacentmultistory reinforced concrete structures with unequal total heights and different story heights isinvestigated. Although inter-story pounding is a common case in practice, it has not been studied beforein the literature as far as the authors are aware. Fifty two pounding cases, each one for two diferentthe inter-story pounding is the local effect on the external column of the tall building that sufers theimpact from the upper floor slab of the adjacent shorter structure. (ii) The ductility demands for thiscolumn are increased comparing with the ones without the pounding effect. In the cases that the twobuildings are in contact these demands appear to be critical since they are higher than the availabledemands of this column are also higher than the ones of the same column without the pounding effect butthey appear to be lower than the available ductility values. (i) It has to be stresed that in all theexamined cases the developed shear forces of this column exceeded the shear strength. Thus, it can beconcluded that in inter-story pounding cases the column that suffers the impact is always in a criticalbegining this column appears to be critical due to high ductility demands as well. The consequences ofthe impact can be very severe for the integrity of the column and may be a primary cause for theinitiation of the collapse of the structure. This means that special measures have to be taken in the designprocess first for the critically increased shear demands and secondly for the high ductility demands.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001115350
|
oai_dc
|
Probabilistic analysis of peak response to nonstationary seismic excitations
|
Probabilistic analysis of peak response to nonstationary seismic excitations
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"S. S. Wang(University of Western Ontario); H. P. Hong(University of Western Ontario)"
] |
The main objective of this study is to examine the accuracy of the complete quadraticcombination (CQC) rule with the modal responses defined by the ordinates of the uniform hazard spectra(UHS) to evaluate the peak responses of the multi-degre-of-freedom (MDOF) systems subjected tothe seismic excitations can be modeled using evolutionary power spectra density functions with uncertainmodel parameters. More specifically, a seismological model and the Kanai-Tajimi model with the boxcaror the exponential modulating functions were used to define the evolutionary power spectral densityfunctions in this study. A set of UHS was obtained based on the probabilistic analysis of transientprobabilistic analysis of the peak responses of MDOF systems were obtained, and compared with thepeak responses calculated by using the CQC rule with the modal responses given by the UHS. Thecomparison seemed to indicate that the use of the CQC rule with the comonly employed correlationcoefficient and the peak modal responses from the UHS could lead to significant under- or over-estimation when contributions from each of the modes are similarly significant.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001003201
|
oai_dc
|
Prediction of the dynamic flow stress
|
Prediction of the dynamic flow stress
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Marcilio Alves(University of Sao Paulo)"
] |
This article explores a constitutive equation that is able to correlate stress, strain and strain rate. In order to show the advantages of the constitutive equation here proposed and how its materialparameters are obtained, data extracted from the literature, for materials as diferent as polymers andmetallic alloys, are used. Finite element simulation of the impact behaviour of a beam is presented tohighlight the care one needs to exercise when using the more traditional Cowper-Symonds equation. The present constitutive equation has shown to be accurate for a wide range of strains, stresses and strain rates.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001001034
|
oai_dc
|
Adaptation of impactor for the split Hopkinson pressure bar in characterizing concrete at medium strain rate
|
Adaptation of impactor for the split Hopkinson pressure bar in characterizing concrete at medium strain rate
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Pengjun Zhao(National Univ. of Singapore); Tat-Seng Lok(Nanyang Technological Univ.)"
] |
The split Hopkinson pressure bar (SHPB) technique is widely used to characterize the dynamic mechanical response of engineering materials at high strain rates. In this paper, attendant problems associated with testing 70 mm diameter concrete specimens are considered, analysed and resolved. An adaptation of a conventional solid circular striker bar, as a means of achieving reliable and repeatable SHPB tests, is then proposed. In the analysis, a pseudo one-dimensional model is used to analyse wave propagation in a non-uniform striker bar. The stress history of the incident wave is then obtained by using the finite difference method. Comparison was made between incident waves determined from the simplified model, finite element solution and experimental data. The results show that the simplified method is adequate for designing striker bar shapes to overcome difficulties commonly encountered in SHPB tests. Using two specifically designed striker bars, tests were conducted on 70 mm diameter steel fibre reinforced concrete specimens. The results are presented in the paper.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001114978
|
oai_dc
|
Thermo-elastic stability behavior of laminated cross-ply elliptical shells
|
Thermo-elastic stability behavior of laminated cross-ply elliptical shells
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"B. P. Patel(Indian Institute of Tech. Delhi); K. K. Shukla(Motilal Nehru National Institute of Tech.); Y. Nath(Indian Institute of Tech. Delhi)"
] |
In this work, thermo-elastic stability behavior of laminated cross-ply elliptical cylindricalhigher-order theory that accounts for the transverse shear and transverse normal deformations, andnonlinear in-plane displacement approximations through the thickness with slope discontinuity at the layerinterfaces. The combined influence of higher-order shear deformation, shell geometry and non-circularityon the prebuckling thermal stress distribution and critical temperature parameter of laminated ellipticalcylindrical shells is examined.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001004004
|
oai_dc
|
The Poisson effect on the curved beam analysis
|
The Poisson effect on the curved beam analysis
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Yih-Cherng Chiang(Chinese Culture Univ.)"
] |
The bending stress formula that taking into account the transverse deformation is developedfor plane-curved, untwisted isotropic beams subjected to loadings that result in deformations in the planeof curvature. In order to account the transverse Poisson contraction effect, a new constitutive relationstrains and deformed curvatures for a curved plateis derived in a 6 6 matrix form. This constitutive relation will provide the fundamental basis to theanalyses of curved structures composing of isotropic or anisotropic materials. Then, the bending stressformula of a curved isotropic beam can be deduced from this newly developed curved plate theory. Thestress predictions by the present analysis are compared to those by the analysis that neglected the Poisoncontraction effect. The results show that the Poisson effect becomes more significant as the Poisson ratioand the curvature are getting larger.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001001035
|
oai_dc
|
Experimental analysis of a semi-actively controlled steel building
|
Experimental analysis of a semi-actively controlled steel building
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Antonio Occhiuzzi(Univ. of Napoli Federico II); Mariacristina Spizzuoco(Univ. of Napoli Federico II)"
] |
The strong need of verifying theories formulated for semi-active control through applicationsto real structures is due to the fact that theoretical research on semi-active control systems is not matchedby a corresponding satisfactory experimental activity. This paper shows how a smart system includingmagnetorheological devices as damping elements can be implemented in a large-scale structural model, bydescribing in detail the kind of electronics (dedicated hardware and software) adopted during theresponse (either experimental or numerical) of the semi-actively controlled structure compared to a passiveoperating control system, and in terms of the evaluation criteria proposed in the benchmark forseismically excited controlled buildings. The paper also explains how to derive from the classical theoryexhaustive picture of the time delays characterizing the control sequence.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001114977
|
oai_dc
|
Storey-based stability analysis of multi-storey unbraced frames
|
Storey-based stability analysis of multi-storey unbraced frames
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Y. Liu(Univ. of Waterloo); L. Xu(Univ. of Waterloo)"
] |
This paper presents a practical method to evaluate the effective length factors for columns inmulti-storey unbraced frames based on the concept of storey-based elastic buckling by means oflateral stiffness of the multi-storey unbraced frame is derived and expressed as the product of the lateralstifness of each storey. Thus, the stability analysis for the multi-storey frame is conducted byinvestigating the lateral stability of each individual storey, which is facilitated through decomposing theproposed by the authors (Xu and Liu 202) for each single-storey PR frame. Prior to introducingdecomposition approaches, the end rotational stiffnes of an axially load column is derived and rotationalstiffness interaction between the upper and lower columns is investigated. Three decompositionapproaches, characterized by means of distributing beam-to-column rotational-restraining stiffness betweenthe upper and lower columns, are proposed. The procedure of calculating storey-based column effectivelength factors is presented. Numerical examples are then given to illustrate the effectiveness of the proposed procedure.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001114932
|
oai_dc
|
Determination of the Vlasov foundation parameters - quadratic variation of elasticity modulus - using FE analysis
|
Determination of the Vlasov foundation parameters - quadratic variation of elasticity modulus - using FE analysis
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mecit Celik(Istanbul Technical Univ.); Mehmet H. Omurtag(Istanbul Technical Univ.)"
] |
The objective of this research was to determine the Vlasov soil parameters for quadraticallyvarying elasticity modulus Es(z) of the compresible soil continuum and discuss the interaction affectbetween two close plates. Interaction problem carried on for uniformly distributed load carrying plates.Plate region was simulated by Kirchhof plate theory based (mixed or displacement type) 2D elementsand the foundation continuum was simulated by displacement type 2D elements. At the contact region,plate and foundation elements were geometrically coupled with each other. In this study the necessaryformulas for the Vlasov parameters were derived when Youngs modulus of the soil continuum wasvarying as a quadratic function of z-coordinate through the depth of the foundation. In the examples, firstEs(z) were compared with the previous examples in order to discuss the general behavior. As a finalexample two plates close to each other resting on elastic foundation were handled to see their interactioninfluences on the Vlasov foundation parameters. Original examples were solved using both mixed and displacement type plate elements in order to confirm the results.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001114976
|
oai_dc
|
Study on strength of reinforced concrete filled circular steel tubular columns
|
Study on strength of reinforced concrete filled circular steel tubular columns
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Wei Hua(Iwate Univ.); Hai-Jun Wang(Shenyang Univ. of Tech.); Akira Hasegawa(Hachinohe Univ. of Tech.); Yukitake Shioi(Hachinohe Univ. of Tech.); Shoji Iwasaki(Iwate Univ.); Yutaka Miyamoto(Iwate Univ.)"
] |
Concrete filed steel tubular columns (CFT) are widely used in civil engineering works,especially in large scale of works because of high strength, deformation, toughness and so on. On thein Hansin-Awaji earthquake of Japan in 1995, reinforced concrete piers were wrapped with steel plate.Then, a new kind of structure appeared, that is, reinforced concrete filed steel tubular column (RCFT). Inthis paper, compresion test and bending-shearing test on RCFT are carried out. The main parameters of(4) arrangement of reinforcing bars. According to the experimental results, the effect of parameters onmechanical characteristics of RCFT is analyzed clearly. At the same time, strength evaluation formula forRCFT column is proposed and tested by experimental results and existed recommendations (AIJ 197).proposed evaluation formula can evaluate the strength of RCFT column properly.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001114933
|
oai_dc
|
Experimental and numerical analysis of fatigue behaviour for tubular K-joints
|
Experimental and numerical analysis of fatigue behaviour for tubular K-joints
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Yong-Bo Shao(Yantai Univ.); Zhen-Bin Cao(Yantai Univ.)"
] |
In this paper, a full-scale K-joint specimen was tested to failure under cyclic combined axialand in-plane bending loads. In the fatigue test, the crack developments were monitored step by step usinga fracture parameter to be frequently used by many designers to predict the integrity and residual life oftubular joints, can be obtained from experimental test results of the crack growth rate. Furthermore, ascheme of automatic mesh generation for a cracked K-joint is introduced, and numerical analysis of stressintegral method is used to estimate the stress intensity factors along the crack front. The numerical stressintensity factor results have been validated through comparing them with the experimental results. Thecomparison shows that the proposed numerical model can produce reasonably accurate stress intensityinvestigated, and it has been found that semi-ellipse is suitable and accurate to be adopted in numericalanalysis for the stress intensity factor. Therefore, the proposed model in this paper is reliable to be usedfor estimating the stres intensity factor values of cracked tubular K-joints for design purposes.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001197894
|
oai_dc
|
Behavior of R/C cylindrical shell under lateral load
|
Behavior of R/C cylindrical shell under lateral load
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"TakashiHara(Tokuyama College of Technology); TsunemiShigematsu(Tokuyama College of Technology); TakahiroTamura(Tokuyama College of Technology)"
] |
In this paper, the structural behavior of R/C cylindrical panel is analyzed by experimentalresults. To avoid the geometric imperfection, R/C shell specimens are made by use of a stiff steel mold.From experimental results, the load carrying behavior of R/C cylindrical panel is presented under anexternal lateral pressure. Even if R/C shell does not poses geometric imperfections, the inaccuracy of thereinforcement position strongly affects to the ultimate strength and the failure patterns of such shells. Toexplain these effects, FEM nonlinear analyses are done under the same conditions as those ofexperiments. The behavior of R/C cylindrical shells are well simulated under the consideration of both thegeometric imperfection and several inaccuracies.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART000911996
|
oai_dc
|
Some explicit solutions to plane equilibrium problem for no-tension bodies
|
Some explicit solutions to plane equilibrium problem for no-tension bodies
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"MassimilianoLucchesi(Universita di Firenze); NicolaZani(Universita di Firenze)"
] |
A method is presented to integrate explicitly certain equilibrium problems for no-tensionbodies, in absence of body forces and under the assumption that two of the principal stresses areeverywhere null. The method is exemplified in the case of rectangular panels, clamped at their bottomsand loaded at their tops.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART000911993
|
oai_dc
|
Differential cubature method for buckling analysis of arbitrary quadrilateral thick plates
|
Differential cubature method for buckling analysis of arbitrary quadrilateral thick plates
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"LanheWu(Shijiazhuang Railway Institute); WenjieFeng(Shijiazhuang Railway Institute)"
] |
In this paper, a novel numerical solution technique, the differential cubature method isemployed to study the buckling problems of thick plates with arbitrary quadrilateral planforms and non-uniform boundary constraints based on the first order shear deformation theory. By using this method, thegoverning diferential equations at each discrete point are transformed into sets of linear homogeneousalgebraic equations. Boundary conditions are implemented through discrete grid points by constrainingdisplacements, bending moments and rotations of the plate. Detailed formulation and implementation ofthis method are presented. The buckling parameters are calculated through solving a standard eigenvalueproblem by subspace iterative method. Convergence and comparison studies are carried out to verify thereliability and accuracy of the numerical solutions. The applicability, efficiency, and simplicity of thepresent method are demonstrated through solving several sample plate buckling problems with variousmixed boundary constraints. It is shown that the diferential cubature method yields comparable numericalsolutions with 2.77-times less degrees of freedom than the diferential quadrature element method and 2-times less degrees of freedom than the energy method. Due to the lack of published solutions for bucklingof thick rectangular plates with mixed edge conditions, the present solutions may serve as benchmarkvalues for further studies in the future.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART000911999
|
oai_dc
|
Feedback control of intelligent structures with uncertainties and its robustness analysis
|
Feedback control of intelligent structures with uncertainties and its robustness analysis
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"ZongjieCao(Shanghai Jiaotong University); BangchunWen(Northeastern University); ZhenbangKuang(Shanghai Jiaotong University)"
] |
Variations in system parameters due to uncertainties of parameters may result in systemperformance deterioration and create system internal stability problems. Uncertainties in structuralmodeling of structures are often considered to ensure that the control system is robust with respect toresponse errors. So the uncertain concept plays an important role in the analysis and design of theengineering structures. In this paper, the active control of the intelligent structures with the uncertainties isstudied and a new method for analyzing the robustnes of systems with the uncertainties is presented.Firstly, the system with uncertain parameters is considered as the perturbation of the system withdeterministic parameters. Secondly, the feedback control law is designed on the basis of deterministicsystem. Thirdly, perturbation analysis and robustness analysis of intelligent structures with uncertaintiesare discussed when the feedback control law is applied to the original system and perturbed system.Combining the convex model of uncertainties with the finite element method, the analysis theory of therobustness of intelligent structures with the uncertainties can be developed. The description andcomputation of the robustnes of intelligent structures with uncertain parameters is obtained. Finally, anumerical example of the application of the present method is given to show the validity of the method.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART000912002
|
oai_dc
|
On the eigenvalues of a uniform rectangular plate carrying any nuber of spring-damper-mass systems
|
On the eigenvalues of a uniform rectangular plate carrying any nuber of spring-damper-mass systems
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Der-WeiChen(National Defense University)"
] |
The goal of this paper is to determine the eigenvalues of a uniform rectangular plate carryingany number of spring-damper-mass systems using an analytical-and-numerical-combined method (ANCM).To this end, a technique was presented to replace each pring-damper-mass system by a maslessequivalent pring-dampersystem with the specified effective spring constant and effective dampingcoefficient. Then, the mode superposition approach was used to transform the partial diferential equationof motion into the matrix equation, and the eigenvalues of the complete system were determined from theassociated characteristic equation. To verify the reliability of the presented theory, all numerical resultsobtained from the ANCM were compared with those obtained from the conventional finite elementmethod (FEM) and god agreement was achieved. Since the order of the property matrices for theequation of motion obtained from the ANCM is much lower than that obtained from the FEM, the CPUtime required by the ANCM is much less than that by the FEM.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001003275
|
oai_dc
|
Shear strength of reinforced concerte dapped-end beams
|
Shear strength of reinforced concerte dapped-end beams
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ing-JangLin(national Taiwan University of Science and Technology); Shyh-JiannHwang(national Taiwan University of Science and Technology); Wen-YaoLu(national Taiwan University of Science and Technology); Jiunn-TyngTsai(national Taiwan University of Science and Technology)"
] |
In this study, 24 high-strength concrete dapped-end beams were tested to study the effects ofthe amount of main dapped-end reinforcement, the nominal shear span-to-depth ratio, and the concretestrength on the shear strength of dapped-end beams. Test results indicate that the shear strength of dappedends increases with the increase in the amount of main dapped-end reinforcement and the concretestrength. The shear strength of dapped-end beam increases with the decrease of nominal shear span-to-depth ratio. A simplified method for determining the shear strength of reinforced concrete dapped ends isalso proposed in this paper. The shear strengths predicted by the proposed method and the approach ofPCI Design Handbook are compared with test results. The comparison shows that the proposed methodcan more accurately predict the shear strength of reinforced concrete dapped-end beams than the approachof PCI Design Handbook.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART000911991
|
oai_dc
|
Field testing of a seismically isolated concrete bridge
|
Field testing of a seismically isolated concrete bridge
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"K.C.Chang(National Taiwan University); M.H.Tsai(China Engineering Consultants); J.S.Hwang(National Taiwan University of Science and Technology); S.S.Wei(National Taiwan University)"
] |
The first seismically isolated structure in Taiwan was completed in early 1999. Seven newbridges of the Second National Freway located at Bai-Ho area, a region which is considered to be ofhigh seismic risk, have been designed and constructed with lead-rubber seismic isolation bearings. Sincethis is the first application of seismic isolation method to the practical construction in Taiwan, field testswere conducted for one of the seven bridges to evaluate the assumptions and uncertainties in the designand construction. The test program is composed of ambient vibration tests, forced vibration tests, and freevibration tests. For the free vibration tests, a special test setup composed of four 1000 kN hydraulic jacksand a quick-release mechanism was designed to perform the function of push-and-quick release. Valuableresults have been obtained based on the correlation between measured and analytical data so that theanalytical model can be calibrated. Based on the analytical correlation, it is concluded that the dynamiccharacteristics and free vibration behavior of the isolated bridge can be well captured when the nonlinearproperties of the bearings are properly considered in the modeling.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART000911997
|
oai_dc
|
Reliablity of TLP tethers under extreme tensions
|
Reliablity of TLP tethers under extreme tensions
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"N.A.Siddiqui(Aligarh Muslim University); SuhailAhmad(Indian of Technology)"
] |
The tension leg platform (TLP) is a moored floating offshore structure whose buoyancy ismore than its weight. The mooring system, known as tethers, is vulnerable to failure due to extreme(maximum and minimum) tensions. In the present study the reliability of these tethers under maximumand minimum tension (ultimate limit state) has been studied. Von-Mises failure criteria has been adoptedto define the failure of a tether against maximum tension. The minimum tension failure criteria has beenassumed to meet when the tethers slack due to loss of tension. First Order Reliability method (FORM)has been adopted for reliability assesment. The reliability, in terms of reliability index, and probability offailure has been obtained for twelve sea states. The probabilities of failure so obtained for different seastates have been adopted for the calculation of annual and life time probabilities of failure.
|
토목공학
| null |
kci_detailed_000081.xml
|
|||
ART001195664
|
oai_dc
|
Stochastic finite element based seismic analysis of framed structures with open-storey
|
Stochastic finite element based seismic analysis of framed structures with open-storey
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"M.Manjuprasad(Structural Engineering Research Center); S.Gopalakrishnan(Structural Engineering Research Center); K.BalaJiRao(Structural Engineering Research Center)"
] |
토목공학
| null |
kci_detailed_000082.xml
|
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