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ART001961587
|
oai_dc
|
Dynamic response of non-uniform Timoshenko beams made of axially FGM subjected to multiple moving point loads
|
Dynamic response of non-uniform Timoshenko beams made of axially FGM subjected to multiple moving point loads
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Buntara S. Gan(Nihon University); Thanh-Huong Trinh(Nihon University); Thi-Ha Le(Hanoi University of Transport and Communications); Dinh-Kien Nguyen(Vietnam Academy of Science and Technology)"
] |
This paper presents a finite element procedure for dynamic analysis of non-uniform Timoshenko beams made of axially Functionally Graded Material (FGM) under multiple moving point loads. The material properties are assumed to vary continuously in the longitudinal direction according to a predefined power law equation. A beam element, taking the effects of shear deformation and cross-sectional variation into account, is formulated by using exact polynomials derived from the governing differential equations of a uniform homogenous Timoshenko beam element. The dynamic responses of the beams are computed by using the implicit Newmark method. The numerical results show that the dynamiccharacteristics of the beams are greatly influenced by the number of moving point loads. The effects of thedistance between the loads, material non-homogeneity, section profiles as well as aspect ratio on the dynamic responses of the beams are also investigated in detail and highlighted.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001961586
|
oai_dc
|
Analysis of material dependency in an elastic - plastic contact models using contact mechanics approach
|
Analysis of material dependency in an elastic - plastic contact models using contact mechanics approach
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"V.C. Sathish Gandhi(University College of Engineering Ariyalur); R. Kumaravelan(Velalar College of Engineering and Technology); S. Ramesh(el Tech High Tech Dr.Rangarajan Dr.Sakunthala Engineering College); K. Sriram(Amrita School of Engineering)"
] |
The study aims on the effect of material dependency in elastic- plastic contact models by contact analysis of sphere and flat contact model and wheel rail contact model by considering the material propertieswithout friction. The various materials are selected for the analysis based on Young‟s modulus and yield strength ratio (E/Y). The simulation software „ANSYS‟ is employed for this study. The sphere and flat contact model is considered as a flattening model, the stress and strain for different materials are estimated. The simulation of wheel-rail contact model is also performed and the results are compared with the flattening model. The comparative study has also been extended for finding out the mean contact pressurefor different materials the E/Y values between 150 and 660. The results show that the elastic-plastic contact analysis for materials up to E/Y=296.6 is depend on the nature of material properties and also for this material the mean contact pressure to yield strength reaches 2.65.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001961589
|
oai_dc
|
Influence of the presence of defects on the stresses shear distribution in the adhesive layer for the single-lap bonded joint
|
Influence of the presence of defects on the stresses shear distribution in the adhesive layer for the single-lap bonded joint
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Aicha Benchiha(University of Sidi Bel Abbes); Kouider Madani(University of Sidi Bel Abbes)"
] |
In this study, the finite element method was used to analyze the distribution of the adhesive shear stresses in the single-lap bonded joint of two plates 2024-T3 aluminum with and without defects. The effects of the adhesive properties (shear modulus, the thickness and the length of the adhesive were highlighted. The results prove that the shear stresses are located on the free edges of the adhesively bonding region, and reach maximum values near the defect, because the concentration of high stress occurs near this area.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001961590
|
oai_dc
|
Modelling of tension-stiffening in bending RC elements based on equivalent stiffness of the rebar
|
Modelling of tension-stiffening in bending RC elements based on equivalent stiffness of the rebar
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Lluis Torres(University of Girona); Cristina Barris(University of Girona); Gintaris Kaklauskas(Vilnius Gediminas Technical University); Viktor Gribniak(Vilnius Gediminas Technical University)"
] |
The contribution of tensioned concrete between cracks (tension-stiffening) cannot be ignoredwhen analysing deformation of reinforced concrete elements. The tension-stiffening effect is crucial when itcomes to adequately estimating the load-deformation response of steel reinforced concrete and the morerecently appeared fibre reinforced polymer (FRP) reinforced concrete. This paper presents a unifiedmethodology for numerical modelling of the tension-stiffening effect in steel as well as FRP reinforcedflexural members using the concept of equivalent deformation modulus and the smeared crack approach toobtain a modified stress-strain relation of the reinforcement. A closed-form solution for the equivalent secantmodulus of deformation of the tensioned reinforcement is proposed for rectangular sections taking theEurocode 2 curvature prediction technique as the reference. Using equations based on general principles ofstructural mechanics, the main influencing parameters are obtained. It is found that the ratio between theequivalent stiffness and the initial stiffness basically depends on the product of the modular ratio andreinforcement ratio (nρ), the effective-to-total depth ratio (d/h), and the level of loading. The proposedmethodology is adequate for numerical modelling of tension-stiffening for different FRP and steelreinforcement, under both service and ultimate conditions. Comparison of the predicted and experimentaldata obtained by the authors indicates that the proposed methodology is capable to adequately model thetension-stiffening effect in beams reinforced with FRP or steel bars within wide range of loading.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001961579
|
oai_dc
|
Fatigue performance of deepwater SCR under short-term VIV considering various S-N curves
|
Fatigue performance of deepwater SCR under short-term VIV considering various S-N curves
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"D.K. Kim(Universiti Teknologi PETRONAS); 최한석(포항공과대학교); C.S. Shin(Pohang University of Science and Technology); M.S. Liew(Universiti Teknologi PETRONAS); 유수영(부산대학교); K.S. Park(POSCO)"
] |
In this study, a method for fatigue performance estimation of deepwater steel catenary riser (SCR) under short-term vortex-induced vibration was investigated for selected S-N curves. General tendency between S-N curve capacity and fatigue performance was analysed. SCRs are generally used to transport produced oil and gas or to export separated oil and gas, and are exposed to various environmental loads in terms of current, wave, wind and others. Current is closely related with VIV and it affects fatiguelife of riser structures significantly. In this regards, the process of appropriate S-N curve selection was performed in the initial design stage based on the scale of fabrication-related initial imperfections such as welding, hot spot, crack, stress concentration factor, and others. To draw the general tendency, the effects of stress concentration factor (SCF), S-N curve type, current profile, and three different sizes of SCRs wereconsidered, and the relationship between S-N curve capacity and short-term VIV fatigue performance of SCR was derived. In case of S-N curve selection, DNV (2012) guideline was adopted and four different current profiles of the Gulf of Mexico (normal condition and Hurricane condition) and Brazil (Amazon basin and Campos basin) were considered. The obtained results will be useful to select the S-N curve for deepwater SCRs and also to understand the relationship between S-N curve capacity and short-term VIV fatigue performance of deepwater SCRs.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001961583
|
oai_dc
|
Creep behaviour of normal- and high-strength self-compacting concrete
|
Creep behaviour of normal- and high-strength self-compacting concrete
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Farhad Aslani(University of New South Wales)"
] |
Realistic prediction of concrete creep is of crucial importance for durability and long-term serviceability of concrete structures. To date, research about the behaviour of self-compacting concrete (SCC) members, especially concerning the long-term performance, is rather limited. SCC is quite different from conventional concrete (CC) in mixture proportions and applied materials, particularly in the presenceof aggregate which is limited. Hence, the realistic prediction of creep strains in SCC is an important requirement for the design process of this type of concrete structures. This study reviews the accuracy of the conventional concrete (CC) creep prediction models proposed by the international codes of practice, including: CEB-FIP (1990), ACI 209R (1997), Eurocode 2 (2001), JSCE (2002), AASHTO (2004), AASHTO (2007), AS 3600 (2009). Also, SCC creep prediction models proposed by Poppe and De Schutter (2005), Larson (2007) and Cordoba (2007) are reviewed. Further, new creep prediction model based on the comprehensive analysis on both of the available models i.e. the CC and the SCC is proposed. The predicted creep strains are compared with the actual measured creep strains in 55 mixtures of SCC and 16 mixtures of CC.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001882588
|
oai_dc
|
The use of topology optimization in the design of truss and frame bridge girders
|
The use of topology optimization in the design of truss and frame bridge girders
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ryszard Kutyłowski(Wrocław University of Technology); Bartosz Rasiak(Alpine Bau GmbH)"
] |
It is shown that topology optimization is a valuable tool for the design of bridge girders. This paper is a follow-up to (Kutyłowski and Rasiak 2014) and it includes an analysis of truss members’ outer dimensions dictated by the standards. Moreover, a frame bridge girder mapped from a selected topology is compared with a typical frame girder on the basis of (Kutyłowski and Rasiak 2014). The analysis shows that topology optimization by means of the proposed algorithm yields a topology from which one can map a frame bridge girder requiring less material for its construction than the typical frame girder currently used in bridge construction.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001882585
|
oai_dc
|
Rheological properties of self consolidating concrete with various mineral admixtures
|
Rheological properties of self consolidating concrete with various mineral admixtures
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Sunil D. Bauchkar(Datta Meghe College of Engineering); H.S. Chore(Datta Meghe College of Engineering)"
] |
This paper reports an experimental study into the rheological behaviour of self consolidatingconcrete (SCC). The investigation aimed at quantifying the impact of the varying amounts of mineral admixtures on the rheology of SCC containing natural sand. Apart from the ordinary Portland cement (OPC), the cementitious materials such as fly ash (FA), ground granulated blast furnace slag (GGBS) and micro-silica (MS) in conjunction with the mineral admixtures were used in different percentages keeping the mix paste volume and flow of concrete constant at higher atmospheric tempterature (30ᵒ to 40ᵒC). The rheological properties of SCC were investigated using an ICAR rheometer with a four-blade vane. The rheological properties of self-consolidating concrete (SCC) containing different mineral admixtures (MA) were investigated using an ICAR rheometer. The mineral admixtures were fly ash (FA), ground granulated blast furnace slag (GGBS), and micro silica (MS). The results obtained using traditional workability results are compared with those obtained using ICAR rheometer. The instrument ICAR (International Center for Aggregate Research) rheometer employed in the present study for evaluating the rhelogical behaviour of the SCC is found to detect systematic changes in workability, cementitious materials, successfully. It can be concluded that the rheology and the slump flow tests can be concurrently used for predicting the flow behaviours of SCC made with different cementitious materials.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001882586
|
oai_dc
|
The evaluation with ANSYS of stresses in hazelnut silos using Eurocode 1
|
The evaluation with ANSYS of stresses in hazelnut silos using Eurocode 1
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Hakan Kibar(Igdir University); Turgut Öztürk(Ondokuz Mayis University)"
] |
In this study, the optimum silo dimensions for the barrel-type steel-concentrated silo with aconical outlet port usable in the hazelnut storage were investigated. Three different types of silo models as Model 1 (1635 tons), Model 2 (620 tons) and Model 3 (1124 tons) were used in the study. Varying wall thicknesses were used for Model 1 (10, 11, 12, 13, 14, 15 and 20 mm), Model 2 (10, 15 and 20 mm) and Model 3 (10, 15 and 20 mm) silos. For Model 1 silo has the most storage capacity here, to determine its optimum wall thickness, the wall thicknesses of 11, 12, 13 and 14 mm were used as different from the other models. Thus the stresses occurring in different lines with ANSYS finite element software were examined. In the study it was determined that the 10, 11 and 12 mm wall thicknesses of the Model 1 silo are not safe in terms of the stresses caused by the vertical pressure loads in the filling conditions. From the view of the filling and discharge conditions, other wall thicknesses and model silos were diagnosed to be secure. The optimum silo dimensions which won’t cause any structural problems have been found out as the Model 1 silo with a 13 mm wall thickness when the filling capacity and the maximum von Mises stresses are takeninto account. This barrel-type silo with conical outlet port sets forth the most convenient properties in hazelnut storing in terms of engineering.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001882587
|
oai_dc
|
Application of topology optimization to bridge girder design
|
Application of topology optimization to bridge girder design
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ryszard Kutyłowski(Wrocław University of Technology); Bartosz Rasiak(Alpine Bau GmbH)"
] |
This study deals with the design of bridge girder structures and consists of two parts. In the first part an optimal bridge girder topology is determined using a software based on structure compliance minimization with constraints imposed on the body mass, developed by the authors. In the second part, an original way in which the topology is mapped into a bridge girder structure is shown. Additionally, a methodof converting the thickness of the bars obtained using the topology optimization procedure into cross sections is introduced. Moreover, stresses and material consumption for a girder design obtained through topology optimization and a typical truss girder are compared. Concluding, this paper shows that topology optimization is a good tool for obtaining optimal bridge girder designs.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001882589
|
oai_dc
|
Comparisons of Elasto-Fiber and Fiber & Bernoulli-Euler reinforced concrete beam-column elements
|
Comparisons of Elasto-Fiber and Fiber & Bernoulli-Euler reinforced concrete beam-column elements
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Muhammet Karaton(Fırat University)"
] |
In this study, two beam-column elements based on the Elasto-Fiber element theory for reinforced concrete (RC) element have been developed and compared with each other. The first element is based on Elasto Fiber Approach (EFA) was initially developed for steel structures and this theory was applied for RC element in there and the second element is called as Fiber & Bernoulli-Euler element approach (FBEA). In this element, Cubic Hermitian polynomials are used for obtaining stiffness matrix. The beams or columnselement in both approaches are divided into a sub-element called the segment for obtaining element stiffness matrix. The internal freedoms of this segment are dynamically condensed to the external freedoms at theends of the element by using a dynamic substructure technique. Thus, nonlinear dynamic analysis of high RC building can be obtained within short times. In addition to, external loads of the segment are assumed to be distributed along to element. Therefore, damages can be taken account of along to element and redistributions of the loading for solutions. Bossak-α integration with predicted-corrected method is used for the nonlinear seismic analysis of RC frames. For numerical application, seismic damage analyses for a 4-story frame and an 8-story RC frame with soft-story are obtained to comparisons of RC element according to both approaches. Damages evaluation and propagation in the frame elements are studied and response quantities from obtained both approaches are investigated in the detail.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001882590
|
oai_dc
|
Free vibration analysis of laminated composite beam under room and high temperatures
|
Free vibration analysis of laminated composite beam under room and high temperatures
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Yusuf Cunedioglu(Nigde University); Bertan Beylergil(Izmir Institute of Technology)"
] |
The aim of this study is to investigate the effects of the beam aspect ratio(L/h), hole diameter,hole location and stacking layer sequence ([0/45/-45/90]s, [45/0/-45/90]s and [90/45/-45/0]s) on naturalfrequencies of glass/epoxy perforated beams under room and high (40, 60, 80, and 100°C) temperatures forthe common clamped-free boundary conditions (cantilever beam). The first three out of plane bending freevibration of symmetric laminated beams is studied by Timoshenko’s first order shear deformation theory. For the numerical analyses, ANSYS 13.0 software package is utilized. The results show that the holediameter, stacking layer sequence and hole location have important effect especially on the second and thirdmode natural frequency values for the short beams and the high temperatures affects the natural frequencyvalues significantly. The results are presented in tabular and graphical form.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001882591
|
oai_dc
|
Rational analysis model and seismic behaviour of tall bridge piers
|
Rational analysis model and seismic behaviour of tall bridge piers
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Jianzhong Li(Tongji University); Zhongguo Guan(Tongji University); Zhiyao Liang(Engineering Management Office)"
] |
This study focuses on seismic behaviour of tall piers characterized by high slender ratio. Two analysis models were developed based on elastic-plastic hinged beam element and elastic-plastic fiber beam element, respectively. The effect of the division density of elastic-plastic hinged beam element on seismicdemand was discussed firstly to seek a rational analysis model for tall piers. Then structural seismicbehaviour such as the formation of plastic hinges, the development of plastic zone, and the displacement at the top of the tall piers were investigated through incremental dynamic analysis. It showed that the seismic behaviour of a tall pier was quite different from that of a lower pier due to higher modes contributions. In a tall pier, an additional plastic zone may occur at the middle height of the pier with the increase of seismicexcitation. Moreover, the maximum curvature reaction at the bottom section and maximum lateral displacement at the top turned out to be seriously out of phase for a tall pier due to the higher modes effect, and thus pushover analysis can not appropriately predict the local displacement capacity.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001882592
|
oai_dc
|
FE assessment of dissipative devices for the blast mitigation of glazing façades supported by prestressed cables
|
FE assessment of dissipative devices for the blast mitigation of glazing façades supported by prestressed cables
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Claudio Amadio(University of Trieste); Chiara Bedon(University of Trieste)"
] |
The paper focuses on the dynamic response of a blast-invested glass-steel curtain wall supported by single-way pretensioned cables. In order to mitigate the critical components of the façade from severe structural damage, an innovative system able to absorb and dissipate part of the blast-induced stresses in the critical façade components is proposed. To improve the blast reliability of the studied glazing system, specifically, rigid-plastic and elastoplastic devices are introduced at the base and at the top of the vertical bearing cables. Several combinations and mechanical calibrations of these devices are numerically investigated and the most structurally and economically advantageous solution is identified. In conclusion, a simple analytical formulation totally derived from energetic considerations is also suggested for a preliminary estimation of the maximum dynamic effects in single-way cable-supported façades subjected to high-level blast loads.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001882594
|
oai_dc
|
Treatment of locking behaviour for displacement-based finite element analysis of composite beams
|
Treatment of locking behaviour for displacement-based finite element analysis of composite beams
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"R. Emre Erkmen(University of Technology Sydney); Mark A. Bradford(The University of New South Wales); Keith Crews(University of Technology, Sydney)"
] |
In the displacement based finite element analysis of composite beams that consist of two Euler-Bernoulli beams juxtaposed with a deformable shear connection, the coupling of the displacement fieldsmay cause oscillations in the interlayer slip field and reduction in optimal convergence rate, known as sliplocking.
In this study, the B-bar procedure is proposed to alleviate the locking effects. It is also shown that by changing the primary dependent variables in the mathematical model, to be able to interpolate the interlayer slip field directly, oscillations in the slip field can be completely eliminated. Examples are presented to illustrate the performance and the numerical characteristics of the proposed methods.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001882595
|
oai_dc
|
Applicability of over-coring technique to loaded RC columns
|
Applicability of over-coring technique to loaded RC columns
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Giuseppe Campione(Università di Palermo); Giovanni Minafò(University “Kore” of Enna)"
] |
Stress determination is a very important step in the assessment of the safety of existing reinforced concrete structures. In rock mechanic this goal is achieved with the over-coring technique. The main ideabehind such a technique is to isolate a material sample from the stress field in the surrounding mass and monitor its re-equilibrium deformation response. If the materials remains elastic, and elastic properties are known, stresses may be obtained from the corresponding measured strains. The goal of this paper is to evaluate if the over-coring technique is applicable to reinforced concrete members. The results of an experimental investigation on the behaviour of compressed concrete columns subjected to the over-coring technique are presented. Considerations about the range of applicability of the technique are made by comparing the measured and the theoretical stresses. After that, results of failure tests on drilled specimens are presented and discussed. Furthermore, the response is compared with that of columns core-bored before the compressive test. Finally, comparisons with numerical analysis are shown.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001896004
|
oai_dc
|
Seismic performance of lateral load resisting systems
|
Seismic performance of lateral load resisting systems
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"K. Subramanian(Coimbatore Institute of Technology); M. Velayutham(Anna University)"
] |
In buildings structures, the flexural stiffness reduction of beams and columns due to concrete cracking plays an important role in the nonlinear load-deformation response of reinforced concrete structures under service loads. Most Seismic Design Codes do not precise effective stiffness to be used in seismic analysis for structures of reinforced concrete elements, therefore uncracked section properties are usually considered in computing structural stiffness. But, uncracked stiffness will never be fully recoveredduring or after seismic response. In the present study, the effect of concrete cracking on the lateral response of structure has been taken into account. Totally 120 cases of 3 Dimensional Dynamic Analysis which considers the real and accidental torsional effects are performed using ETABS to determine the effective structural system across the height, which ensures the performance and the economic dimensions that achieve the saving in concrete and steel amounts thus achieve lower cost. The result findings exhibits that the dual system was the most efficient lateral load resisting system based on deflection criterion, as they yielded the least values of lateral displacements and inter-storey drifts. The shear wall system was the most economical lateral load resisting compared to moment resisting frame and dual system but they yielded the large values of lateral displacements in top storeys. Wall systems executes tremendous stiffness at the lower levels of the building, while moment frames typically restrain considerable deformations and provide significant energy dissipation under inelastic deformations at the upper levels. Cracking found to be more impact over moment resisting frames compared to the Shear wall systems. The behavior of various lateral load resisting systems with respect to time period, mode shapes, storey drift etc. are discussed in detail.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001896008
|
oai_dc
|
An accurate novel method for solving nonlinear mechanical systems
|
An accurate novel method for solving nonlinear mechanical systems
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mahdi Bayat(Islamic Azad University); Iman Pakar(Islamic Azad University); Mahmoud Bayat(Islamic Azad University)"
] |
This paper attempts to investigate the nonlinear dynamic analysis of strong nonlinear problems by proposing a new analytical method called Hamiltonian Approach (HA). Two different cases are studied to show the accuracy and efficiency of the method. This approach prepares us to obtain the nonlinear frequency of the nonlinear systems with the first order of the solution with a high accuracy. Finally, to verify the results we present some comparisons between the results of Hamiltonian approach and numerical solutions using Runge-Kutta’s [RK] algorithm. This approach has a powerful concept and the high accuracy, so it can be apply to any conservative nonlinear problems without any limitations.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001896000
|
oai_dc
|
Seismic capacity of brick masonry walls externally bonded GFRP under in-plane loading
|
Seismic capacity of brick masonry walls externally bonded GFRP under in-plane loading
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Quanfeng Wang(Huaqiao University); Zhenling Chai(Huaqiao University); Lingyun Wang(Shanghai Institute of Technology)"
] |
By carrying out the experiment of eight pieces of brick masonry walls with pilaster strengthened by Glass fiber reinforced polymer (GFRP) and one piece of normal masonry wall with pilaster under low reversed cyclic loading, the failure characteristic of every wall is explained; Seismic performances such as hysteresis, stiffness and its degeneration, deformation, energy consumption and influence of some measures including strengthening means, reinforcement area proportion between GFRP and wall surface, “through-wall” anchor on reinforcement effects are studied. The test results showed that strengthening modes have little influence on stiffness, stiffness degeneration and deformation of the wall, but it is another thing for energy consumption of the wall; The ultimate load, deformation and energy consumption of the walls reinforced by glass fiber sheets was increased remarkably, rigidity and its degeneration was slower; Seismic performance of the wall which considers strengthening means, reinforcement area proportion between GFRP and wall surface, “through –wall” anchor at the same time is better than under the other conditions.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001896001
|
oai_dc
|
Effectiveness of different standard and advanced pushover procedures for regular and irregular RC frames
|
Effectiveness of different standard and advanced pushover procedures for regular and irregular RC frames
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Luca Landi(University of Bologna); Bernardino Pollio(University of Bologna); Pier Paolo Diotallevi(University of Bologna)"
] |
The purpose of the research presented in this paper was to investigate the effectiveness of several conventional, multi-modal and adaptive pushover procedures. In particular, an extensive numerical study was performed considering eight RC frames characterized by a variable number of storeys and different properties in terms of regularity in elevation. The results of pushover analyses were compared with those of nonlinear dynamic analyses, which were carried out considering different earthquake records andincreasing values of earthquake intensity. The study was performed with reference to base shear-top displacement curves and to different storey response parameters. The obtained results allowed a direct comparison between the pushover procedures, which in general were able to give a fairly good estimate of seismic demand with a tendency to better results for lower frames. The advanced procedures, in particular the multi-modal pushover, provided an improvement of the results, more evident for the irregular frames.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001896002
|
oai_dc
|
Seismic response and damage development analyses of an RC structural wall building using macro-element
|
Seismic response and damage development analyses of an RC structural wall building using macro-element
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Miloud Hemsas(University of Mascara); Sidi-Mohammed Elachachi(University of Bordeaux 1); Denys Breysse(University of Bordeaux 1)"
] |
Numerical simulation of the non-linear behavior of (RC) structural walls subjected to severe earthquake ground motions requires a reliable modeling approach that includes important material characteristics and behavioral response features. The objective of this paper is to optimize a simplified method for the assessment of the seismic response and damage development analyses of an RC structural wall building using macro-element model. The first stage of this study investigates effectiveness and ability of the macro-element model in predicting the flexural nonlinear response of the specimen based on previous experimental test results conducted in UCLA. The sensitivity of the predicted wall responses to changes in model parameters is also assessed. The macro-element model is next used to examine the dynamic behavior of the structural wall building−all the way from elastic behavior to global instability, by applying an approximate Incremental Dynamic Analysis (IDA), based on Uncoupled Modal Response History Analysis (UMRHA), setting up nonlinear single degree of freedom systems. Finally, the identification of the global stiffness decrease as a function of a damage variable is carried out by means of this simplified methodology. Responses are compared at various locations on the structural wall by conducting static and dynamic pushover analyses for accurate estimation of seismic performance of the structure using macro-element model. Results obtained with the numerical model for rectangular wall cross sections compare favorably with experimental responses for flexural capacity, stiffness, and deformability. Overall, the model is qualified for safety assessment and design of earthquake resistant structures with structural walls.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001896005
|
oai_dc
|
Construction failures of masonry and adobe buildings during the 2011 Van earthquakes in Turkey
|
Construction failures of masonry and adobe buildings during the 2011 Van earthquakes in Turkey
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Erkut Sayın(Fırat University); Burak Yön(Fırat University); Yusuf Calayır(Fırat University); Mesut Gör(Fırat University)"
] |
On October 23, 2011, an earthquake of magnitude 7.0 struck Van, Turkey. This powerful earthquake caused the deaths of 604 people, more than 2,000 injuries, and a considerable loss of property. After this devastating earthquake, on November 9, 2011, another earthquake of magnitude 5.7 occurred. This moderate earthquake caused the deaths of 40 people. Partial and total collapse of the masonry and adobe buildings occurred in the rural areas of Van. In this paper, the acceleration records and responsespectrums of the earthquakes were given and the structural deficiencies and reasons of the failures of the rural buildings were evaluated according to the Turkish Seismic Code. The observed failures showed that low quality of structural materials, poor workmanship, lack of engineering services and insufficient detailing of the structural elements are the main reasons of damages.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001895999
|
oai_dc
|
Corrosion resistant self-compacting concrete using micro and nano silica admixtures
|
Corrosion resistant self-compacting concrete using micro and nano silica admixtures
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mostafa Jalal(Islamic Azad University)"
] |
In this paper, enhancement of corrosion and chloride resistance of high performance self compacting concrete (SCC) through incorporating nanosilica into the binder has been investigated. For this purpose, different mixtures were designed with different amounts of silica fume and nano silica admixtures. Different binder contents were also investigated to observe the binder content effect on the concrete properties. Corrosion behavior was evaluated by chloride penetration and resitivity tests. Water absorptionand capillary absorption were also measured as other durability-related properties. The results showed that water absorption, capillary absorption and Cl ion percentage decreased rather significantly in the mixtures containing admixtures especially blend of silica fume and nano silica. By addition of the admixtures, resistivity of the SCC mixtures increased which can lead to reduction of corrosion probability.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001896003
|
oai_dc
|
The empirical corner stiffness for right-angle frames of rectangular and H-type cross-sections
|
The empirical corner stiffness for right-angle frames of rectangular and H-type cross-sections
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"권영두(경북대학교); 권순범(경북대학교); 길혁문(현대중공업); 조희정(경북대학교)"
] |
Until now, the finite corner stiffness of the right-angle frames used as horizontal girders in a bonnet, have not been considered during the design process to result in not a precise result. This paper presents a design equation set for right-angle frames used as horizontal girders in a bonnet assuming rigid corner stiffness. By comparing the center stresses of the right-angle frame according to the design equation set with the results of the finite element method, the master curves for the empirical corner stiffness can be determined as a function of slenderness ratio. A second design equation set for a right-angle frame assuming finite corner stiffness was derived and compared with the first equation set. The master curves for the corner stiffness and the second design equation set can be used to determine the design moments at the centers of the girder so that the bending stresses can be analyzed more precisely.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001895997
|
oai_dc
|
Optimum design of axially symmetric cylindrical reinforced concrete walls
|
Optimum design of axially symmetric cylindrical reinforced concrete walls
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Gebrail Bekdaş(Istanbul University)"
] |
The main aim of this paper is to investigate the relationship between thickness and height of the axially symmetric cylindrical reinforced concrete (RC) walls by the help of a meta-heuristic optimization procedure. The material cost of the wall which includes concrete, reinforcement and formwork, was chosen as objective function of the optimization problem. The wall thickness, compressive strength of concrete and diameter of reinforcement bars were defined as design variables and tank volume, radius and height of the wall, loading condition and unit cost of material were defined as design constants. Numerical analyses of the wall were conducted by using superposition method (SPM) considering ACI 318-Building coderequirements for structural concrete. The optimum wall thickness-height relationship was investigated under three main cases related with compressive strength of concrete and density of the stored liquid. According to the results, the proposed method is effective on finding the optimum design with minimum cost.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001895998
|
oai_dc
|
Minimum dynamic response of cantilever beams supported by optimal elastic springs
|
Minimum dynamic response of cantilever beams supported by optimal elastic springs
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ersin Aydin(Nigde University)"
] |
In this study, optimal distribution of springs which supports a cantilever beam is investigated to minimize two objective functions defined. The optimal size and location of the springs are ascertained tominimize the tip deflection of the cantilever beam. Afterwards, the optimization problem of springs is set up to minimize the tip absolute acceleration of the beam. The Fourier Transform is applied on the equation of motion and the response of the structure is defined in terms of transfer functions. By using any structural mode, the proposed method is applied to find optimal stiffness and location of springs which supports a cantilever beam. The stiffness coefficients of springs are chosen as the design variables. There is an active constraint on the sum of the stiffness coefficients and there are passive constraints on the upper and lower bounds of the stiffness coefficients. Optimality criteria are derived by using the Lagrange Multipliers. Gradient information required for solution of the optimization problem is analytically derived. Optimal designs obtained are compared with the uniform design in terms of frequency responses and time response. Numerical results show that the proposed method is considerably effective to determine optimal stiffness coefficients and locations of the springs.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001926024
|
oai_dc
|
Design of isolated footings of circular form using a new model
|
Design of isolated footings of circular form using a new model
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Arnulfo Luévanos Rojas(Juárez University of Durango State)"
] |
This paper presents the design of reinforced concrete circular footings subjected to axial loadand bending in two directions using a new model. The new model considers the soil real pressure acting on contact surface of the circular footings and these are different, with a linear variation in the contact area, these pressures are presented in terms of the axial load, moments around the axis “X” and the axis “Y”. The classical model takes into account only the maximum pressure of the soil for design of footings and it is considered uniform at all points of contact area. Also, a comparison is presented in terms of the materialsused (steel and concrete) between the two models shown in table, being greater the classical model with respect the new model. Therefore, the new model is the most appropriate, since it is more economic and also is adjusted to real conditions.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001926026
|
oai_dc
|
Torsional flexural steady state response of monosymmetric thin-walled beams under harmonic loads
|
Torsional flexural steady state response of monosymmetric thin-walled beams under harmonic loads
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mohammed A. Hjaji(University of Tripoli); Magdi Mohareb(University of Ottawa)"
] |
Starting with Hamilton’s variational principle, the governing field equations for the steady stateresponse of thin-walled beams under harmonic forces are derived. The formulation captures sheardeformation effects due to bending and warping, translational and rotary inertia effects and as well astorsional flexural coupling effects due to the cross section mono-symmetry. The equations of motion consistof four coupled differential equations in the unknown displacement field variables. A general closed formsolution is then developed for the coupled system of equations. The solution is subsequently used to developa family of shape functions which exactly satisfy the homogeneous form of the governing field equations. Asuper-convergent finite element is then formulated based on the exact shape functions. Key features of theelement developed include its ability to (a) isolate the steady state response component of the response tomake the solution amenable to fatigue design, (b) capture coupling effects arising as a result of sectionmono-symmetry, (c) eliminate spatial discretization arising in commonly used finite elements, (d) avoidingshear locking phenomena, and (e) eliminate the need for time discretization. The results based on the presentsolution are found to be in excellent agreement with those based on finite element solutions at a smallfraction of the computational and modelling cost involved.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001925992
|
oai_dc
|
Free vibration analysis of bidirectional functionally graded annular plates resting on elastic foundations using differential quadrature method
|
Free vibration analysis of bidirectional functionally graded annular plates resting on elastic foundations using differential quadrature method
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Vahid Tahouneh(Islamic Azad University)"
] |
This paper deals with free vibration analysis of bidirectional functionally graded annular platesresting on a two-parameter elastic foundation. The formulations are based on the three-dimensional elasticitytheory. This study presents a novel 2-D six-parameter power-law distribution for ceramic volume fraction of2-D functionally graded materials that gives designers a powerful tool for flexible designing of structuresunder multi-functional requirements. Various material profiles along the thickness and in the in-planedirections are illustrated by using the 2-D power-law distribution. The effective material properties at a pointare determined in terms of the local volume fractions and the material properties by the Mori-Tanakascheme. The 2-D differential quadrature method as an efficient and accurate numerical tool is used todiscretize the governing equations and to implement the boundary conditions. The fast rate of convergenceof the method is shown and the results are compared against existing results in literature. Some new resultsfor natural frequencies of the plates are prepared, which include the effects of elastic coefficients offoundation, boundary conditions, material and geometrical parameters. The interesting results indicate that agraded ceramic volume fraction in two directions has a higher capability to reduce the natural frequencythan conventional 1-D functionally graded materials.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001926017
|
oai_dc
|
Buckling load optimization of laminated plates via artificial bee colony algorithm
|
Buckling load optimization of laminated plates via artificial bee colony algorithm
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Umut Topal(Karadeniz Technical University); Hasan Tahsin Öztürk(Karadeniz Technical University)"
] |
In this present work, Artificial Bee Colony Algorithm (ABCA) is used to optimize the stacking sequences of simply supported antisymmetric laminated composite plates with criticial buckling load as the objective functions. The fibre orientations of the layers are selected as the optimization design variables with the aim to find the optimal laminated plates. In order to perform the optimization based on the ABCA, a special code is written in MATLAB software environment. Several numerical examples are presented toillustrate this optimization algorithm for different plate aspect ratios, number of layers and load ratios.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001926006
|
oai_dc
|
Assessment of concrete degradation in existing structures: a practical procedure
|
Assessment of concrete degradation in existing structures: a practical procedure
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Francesco Porco(Politecnico di Bari); Giuseppina Uva(Politecnico di Bari); Andrea Fiore(Politecnico di Bari); Mauro Mezzina(Politecnico di Bari)"
] |
In the assessment of existing RC buildings, the reliable appraisal of the compressive strength of in-situ concrete is a fundamental step. Unfortunately, the data that can be obtained by the available testing methods are typically affected by a high level of uncertainty. Moreover, in order to derive indications about the degradation and ageing of the materials by on site tests, it is necessary to have the proper terms of comparison, that is to say, to know the reference data measured during the construction phases, that are often unavailable when the building is old. In the cases when such a comparison can be done, the in situ strength values typically turn out to be lower than the reference strength values (tests performed on taken samples during the construction). At this point, it is crucial to discern and quantify the specific effect induced by different factors: ageing of the materials; poor quality of the placement, consolidation or cure of the concreteduring the construction phases; damage due to drilling. This paper presents a procedure for correlating the destructive compressive tests and non-destructive tests (ultrasonic pulse velocity tests) with the data documenting the compressive strength tested during the construction phases. The research work is aimed at identifying the factors that induce the difference between the in-situ strength and cubes taken from theconcrete casting, and providing, so, useful information for the assessment procedure of the building.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001926012
|
oai_dc
|
Optimal design of plane frame structures using artificial neural networks and ratio variables
|
Optimal design of plane frame structures using artificial neural networks and ratio variables
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Chin-Sheng Kao(Tamkang University); I-Cheng Yeh(Tamkang University)"
] |
There have been many packages that can be employed to analyze plane frames. However, because most structural analysis packages suffer from closeness of system, it is very difficult to integrate it with an optimization package. To overcome the difficulty, we proposed a possible alternative, DAMDO, which integrate Design, Analysis, Modeling, Definition, and Optimization phases into an integrative environment. The DAMDO methodology employs neural networks to integrate structural analysis package and optimization package so as not to need directly to integrate these two packages. The key problem of the DAMDO approach is how to generate a set of reasonable random designs in the first phase. According to the characteristics of optimized plane frames, we proposed the ratio variable approach to generate them. The empirical results show that the ratio variable approach can greatly improve the accuracy of the neural networks, and the plane frame optimization problems can be solved by the DAMDO methodology.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001926031
|
oai_dc
|
Buckling optimization of laminated composite plate with elliptical cutout using ANN and GA
|
Buckling optimization of laminated composite plate with elliptical cutout using ANN and GA
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"P. Emmanuel Nicholas(PSNA College of Engineering and Technology); K.P. Padmanaban(SBM College of Engineering and Technology); D. Vasudevan(PSNA College of Engineering and Technology)"
] |
Buckling optimization of laminated composite plates is significant as they fail because ofbuckling under in-plane compressive loading. The plate is usually modeled without cutout so that thebuckling strength is found analytically using classical laminate plate theory (CLPT). However in real worldapplications, the composite plates are modeled with cutouts for getting them assembled and to offer theprovisions like windows, doors and control system. Finite element analysis (FEA) is used to analyze thebuckling strength of the plate with cutouts and it leads to high computational cost when the plate isoptimized. In this article, a genetic algorithm based optimization technique is used to optimize the compositeplate with cutout. The computational time is highly reduced by replacing FEA with artificial neural network(ANN). The effectiveness of the proposed method is explored with two numerical examples.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001925987
|
oai_dc
|
Shear resistance of stud connectors in high strength concrete
|
Shear resistance of stud connectors in high strength concrete
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"이영학(경희대학교); 김민숙(경희대학교); 김희철(경희대학교); 김대진(경희대학교)"
] |
The use of steel-concrete composite members has been significantly increased as they have the advantages of the reduction of cross sectional areas, excellent ductility against earthquake loadings and a longer life span than typical steel frame members. The increased use of composite members requires an intensive study on the shear resistance evaluation of stud connectors in high strength concrete. However, the applicability of currently available standards is limited to composite members with normal and lightweight strength concrete. In this paper, push-out tests were performed on 24 specimens to investigate the structural behavior and shear resistance of stud connectors in high strength concrete. Test parameters include the existence of shear studs, height to diameter ratio of a shear stud, its diameter and concrete cover thickness. A shear resistance equation of stud connectors is proposed through a linear regression analysis based on the test results. Its accuracy is compared with those of existing shear resistance equations for studs in normal and lightweight concrete.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001926035
|
oai_dc
|
Theoretical analysis of overlay resisting crack propagation in old cement concrete pavement
|
Theoretical analysis of overlay resisting crack propagation in old cement concrete pavement
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Baofeng Pan(Dalian University of technology); Yuanyuan Gao(Yan Shan University); Yang Zhong(Dalian University of technology)"
] |
The main purpose of this study is to determine the effect of overlay on the crack propagation. In order to simplify the problem, a cement concrete pavement is modeled as an elastic plate on Winkler foundation. To derive the singular integral equations, the Fourier transform and dislocation density function are used. Lobatto-Chebyshev integration formula, as a numerical method, is used to solve the singular integral equations. The numerical solution of stress intensity factor at the crack tip is derived. In order to examine the effect of overlay for resisting crack propagation, numerical analyses are carried out for a cement concrete pavement with an embedded crack and a concrete pavement with an asphalt overlay. Results show the significant factors that influence the crack propagation.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001926009
|
oai_dc
|
Performance of non-prismatic simply supported prestressed concrete beams
|
Performance of non-prismatic simply supported prestressed concrete beams
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"P. Markandeya Raju(Maharaj Vijayram Gajapathi Raj College of Engineering); K. Rajsekhar(Andhra University); T. Raghuram Sandeep(Bhabha Atomic Research Centre)"
] |
Prestressing is the most commonly employed technique in bridges and long span beams incommercial buildings as prestressing results in slender section with higher load carrying capacities. Thiswork is an attempt to study the performance of a minimum weight prestressed concrete beam adopting a non-prismatic section so that there will be a reduction in the volume of concrete which in turn reduces the self-weight of the structure. The effect of adopting a non-prismatic section on parameters like prestressing force, area of prestressing steel, bending stresses, shear stresses and percentage loss of prestress are established theoretically. The analysis of non-prismatic prestressed beams is based on the assumption of pure bending theory. Equations are derived for dead load bending moment, eccentricity, and depth at any requiredsection. Based on these equations an algorithm is developed which does the stress checks for the givensection for every 500 mm interval of the span. Limit state method is used for the design of beam and finitedifference method is used for finding out the deflection of a non-prismatic beam. All the parameters of nonprismatic prestressed concrete beams are compared with that of the rectangular prestressed concrete members and observed that minimum weight design and economical design are not same. Minimum weight design results in the increase in required area of prestressing steel.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001926038
|
oai_dc
|
Effects of infilled concrete and longitudinal rebar on flexural performance of composite PHC pile
|
Effects of infilled concrete and longitudinal rebar on flexural performance of composite PHC pile
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"방진욱(충남대학교); 이방연(전남대학교); 현정환(충남대학교); 김윤용(충남대학교); 이병재((주)제이엔티아이엔씨)"
] |
Concrete infill and reinforcement are one of the most well-known strengthening methods of structural elements. This study investigated flexural performance of concrete infill composite PHC pile (ICP pile) reinforced by infill concrete and longitudinal rebars in hollow PHC pile. A total four series of pile specimens were tested by four points bending method under simply supported conditions and investigated bending moment experimentally and analytically. From the test results, it was found that although reinforcement of infilled concrete on the pure bending moment of PHC pile was negligible, reinforcement of PHC pile using infilled concrete and longitudinal rebars increase the maximum bending moment with range from 1.95 to 2.31 times than that of conventional PHC pile. The error of bending moment between experimental results and predicted results by nonlinear sectional analysis on the basis of the conventional layered sectional approach was in the range of -2.54 % to 2.80 %. The axial compression and moment interaction analysis for ICP piles shows more significant strengthening effects of infilled concrete and longitudinal rebars.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001925997
|
oai_dc
|
Second order effects of external prestress on frequencies of simply supported beam by energy method
|
Second order effects of external prestress on frequencies of simply supported beam by energy method
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"De-Ping Fang(Huaqiao University)"
] |
Based on the energy method considering the second order effects, the natural frequencies of externally prestressed simply supported beam and the compression softening effect of external prestress force were analyzed. It is concluded that the compression softening effect depends on the loss of external tendon eccentricity. As the number of deviators increases from zero to a large number, the compression softening effect of external prestress force decreases from the effect of axial compression to almost zero, which is consistent with the conclusion mathematically rigorously proven. The frequencies calculated by the energy method conform well to the frequencies by FEM which can simulate the frictionless slide between the external tendon and deviator, the accuracy of the energy method is validated. The calculation results show that the compression softening effect of external prestress force is negligible for the beam with 2 or more deviators due to slight loss of external tendon eccentricity. As the eccentricity and area of tendon increase, the first natural frequency of the simply supported beams noticeably increases, however the effect of the external tendon on other frequencies is negligible.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001876249
|
oai_dc
|
Maximum a posteriori estimation based wind fragility analysis with application to existing linear or hysteretic shear frames
|
Maximum a posteriori estimation based wind fragility analysis with application to existing linear or hysteretic shear frames
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Vincent Z. Wang(James Cook University); John D. Ginger(James Cook University)"
] |
Wind fragility analysis provides a quantitative instrument for delineating the safety performance of civil structures under hazardous wind loading conditions such as cyclones and tornados. It has attracted and would be expected to continue to attract intensive research spotlight particularly in the nowadaysworldwide context of adapting to the changing climate. One of the challenges encumbering efficacious assessment of the safety performance of existing civil structures is the possible incompleteness of thestructural appraisal data. Addressing the issue of the data missingness, the study presented in this paper forms a first attempt to investigate the feasibility of using the expectation-maximization (EM) algorithm and Bayesian techniques to predict the wind fragilities of existing civil structures. Numerical examples of typical linear or hysteretic shear frames are introduced with the wind loads derived from a widely used power spectral density function. Specifically, the application of the maximum a posteriori estimates of the distribution parameters for the story stiffness is examined, and a surrogate model is developed and applied to facilitate the nonlinear response computation when studying the fragilities of the hysteretic shear frame involved.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001876241
|
oai_dc
|
Thermal-pressure loading effect on containment structure
|
Thermal-pressure loading effect on containment structure
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"곽효경(한국과학기술원); 권양수(한국과학기술원)"
] |
Because the elevated temperature degrades the mechanical properties of materials used in containments, the global behavior of containments subjected to the internal pressure under high temperature is remarkably different from that subjected to the internal pressure only. This paper concentrates on the nonlinear finite element analyses of the nuclear power plant containment structures, and the importance for the consideration of the elevated temperature effect has been emphasized because severe accident usually accompanies internal high pressure together with a high temperature increase. In addition to the consideration of nonlinear effects in the containment structure such as the tension stiffening and bond-slip effects, the change in material properties under elevated temperature is also taken into account. This paper, accordingly, focuses on the three-dimensional nonlinear analyses with thermal effects. Upon the comparison of experiment data with numerical results for the SNL 1/4 PCCV tested by internal pressure only, threedimensional analyses for the same structure have been performed by considering internal pressure and temperature loadings designed for two kinds of severe accidents of Saturated Station Condition (SSC) and Station Black-out Scenario (SBO). Through the difference in the structural behavior of containment structures according to the addition of temperature loading, the importance of elevated temperature effect onthe ultimate resisting capacity of PCCV has been emphasized.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001876254
|
oai_dc
|
The construction of second generation wavelet-based multivariable finite elements for multiscale analysis of beam problems
|
The construction of second generation wavelet-based multivariable finite elements for multiscale analysis of beam problems
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Youming Wang(Xi’an University of Posts and Telecommunications); Qing Wu(Xi’an University of Posts and Telecommunications); Wenqing Wang(Xi’an University of Posts and Telecommunications)"
] |
A design method of second generation wavelet (SGW)-based multivariable finite elements is proposed for static and vibration beam analysis. An important property of SGWs is that they can be custom designed by selecting appropriate lifting coefficients depending on the application. The SGW-based multivariable finite element equations of static and vibration analysis of beam problems with two and three kinds of variables are derived based on the generalized variational principles. Compared to classical finiteelement method (FEM), the second generation wavelet-based multivariable finite element method (SGWMFEM) combines the advantages of high approximation performance of the SGW method and independent solution of field functions of the MFEM. A multiscale algorithm for SGW-MFEM is presented to solve structural engineering problems. Numerical examples demonstrate the proposed method is a flexible and accurate method in static and vibration beam analysis.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001876239
|
oai_dc
|
Mechanical behavior of composite gel periodic structures with the pattern transformation
|
Mechanical behavior of composite gel periodic structures with the pattern transformation
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Jianying Hu(Xi’an Jiaotong University); Yuhao He(Xi’an Jiaotong University); Jincheng Lei(Xi’an Jiaotong University); Zishun Liu(Xi’an Jiaotong University); Somsak Swaddiwudhipong(National University of Singapore)"
] |
When the periodic cellular structure is loaded or swelling beyond the critical value, the structure may undergo a pattern transformation owing to the local elastic instabilities, thus leading to structural collapse and the structure changing to a new configuration. Based on this deformation-triggered pattern, we have proposed the novel composite gel materials. This designed material is a type of architectural material possessing special mechanical properties. In this study, the mechanical behavior of the composite gel periodic structure with various gel inclusions is studied further through numerical simulations. When pattern transformation occurs, it results in a different elastic relationship compared with the material at untransformed state. Based on the obtained nominal stress versus nominal strain behavior, the Poisson‟s ratio and corresponding deformed structure patterns, we investigate the performance of designed composite materials and the effects of the uniformly distributed gel inclusions on composite materials. A better understanding of the characteristics of these composite gel materials is a key to develop its potential applications on new soft machines.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001876235
|
oai_dc
|
Mimicking the pattern formation of fruits and leaves using gel materials
|
Mimicking the pattern formation of fruits and leaves using gel materials
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Li Chen(National University of Singapore); Yang Zhang(National University of Singapore); Somsak Swaddiwudhipong(National University of Singapore); Zishun Liu(Xi’an Jiaotong University)"
] |
Gel materials have recently gained more attention due to its unique capability of large andreversible volumetric changes. This study explores the possibility of mimicking the pattern formation ofcertain natural fruits during their growing process and leaves during drying processes through the swellingand de-swelling of gel materials. This will hopefully provide certain technical explanations on themorphology of fruits and plants. We adopt the inhomogeneous field gel theory to predict the deformationconfigurations of gel structures to describe the morphology of natural fruits and plants. The growingprocesses of apple and capsicum are simulated by imposing appropriate boundary conditions and fieldloading via varying the chemical potential from their immature to mature stages. The drying processes ofthree types of leaves with different vein structures are also investigated. The simulations lead to promisingresults and demonstrate that pattern formation of fruits and plants may be described from mechanicalperspective by the behavior of gel materials based on the inhomogeneous field theory.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001876244
|
oai_dc
|
Experimental study on creep and shrinkage of high- performance ultra lightweight cement composite of 60MPa
|
Experimental study on creep and shrinkage of high- performance ultra lightweight cement composite of 60MPa
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Kok-Seng Chia(Nautic Group Pte Ltd); Xuemei Liu(Queensland University of Technology); Jat-Yuen Richard Liew(National University of Singapore); Min-Hong Zhang(National University of Singapore)"
] |
Creep and shrinkage behaviour of an ultra lightweight cement composite (ULCC) up to 450 days was evaluated in comparison with those of a normal weight aggregate concrete (NWAC) and a lightweight aggregate concrete (LWAC) with similar 28-day compressive strength. The ULCC is characterized by low density < 1500 kg/m3 and high compressive strength about 60 MPa. Autogenous shrinkage increased rapidly in the ULCC at early-age and almost 95% occurred prior to the start of creep test at 28 days. Hence, majority of shrinkage of the ULCC during creep test was drying shrinkage. Total shrinkage of the ULCC during the 450-day creep test was the lowest compared to the NWAC and LWAC. However, corresponding total creep in the ULCC was the highest with high proportion attributed to basiccreep (≥ ~90%) and limited drying creep. The high creep of the ULCC is likely due to its low elastic modulus. Specific creep of the ULCC was similar to that of the NWAC, but more than 80% higher than the LWAC. Creep coefficient of the ULCC was about 47% lower than that of the NWAC but about 18% higher than that of the LWAC. Among five creep models evaluated which tend to over-estimate the creep coefficient of the ULCC, EC2 model gives acceptable prediction within +25% deviations. The EC2 model may be used as a first approximate for the creep of ULCC in the designs of steel-concrete composites or sandwich structures in the absence of other relevant creep data.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001876253
|
oai_dc
|
Energy release rate for kinking crack using mixed finite element
|
Energy release rate for kinking crack using mixed finite element
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Bouziane Salah(University of 20 August 1955 Skikda); Bouzerd Hamoudi(University of 20 August 1955 Skikda); Boulares Noureddine(University of 20 August 1955 Skikda); Guenfoud Mohamed(University of Guelma)"
] |
A numerical method, using a special mixed finite element associated with the virtual crack extension technique, has been developed to evaluate the energy release rate for kinking cracks. The element is two dimensional 7-node mixed finite element with 5 displacement nodes and 2 stress nodes. The mixed finite element ensures the continuity of stress and displacement vectors on the coherent part and the free edge effect. This element has been formulated starting from a parent element in a natural plane with the aim to model different types of cracks with various orientations. Example problems with kinking cracks in a homogeneous material and bimaterial are presented to assess the computational accuracies.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001876256
|
oai_dc
|
Probabilistic analysis of micro-film buckling with parametric uncertainty
|
Probabilistic analysis of micro-film buckling with parametric uncertainty
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Zuguang Ying(Zhejiang University); Yong Wang(Zhejiang University); Zefei Zhu(Hangzhou Dianzi University)"
] |
The intentional buckling design of micro-films has various potential applications in engineering. The buckling amplitude and critical strain of micro-films are the crucial parameters for the buckling design. In the reported studies, the film parameters were regarded as deterministic. However, the geometrical and physical parameters uncertainty of micro-films due to manufacturing becomes prominent and needs to be considered. In the present paper, the probabilistic nonlinear buckling analysis of micro-films with uncertain parameters is proposed for design accuracy and reliability. The nonlinear differential equation and its asymptotic solution for the buckling micro-film with nominal parameters are firstly established. The mean values, standard deviations and variation coefficients of the buckling amplitude and critical strain are calculated by using the probability densities of uncertain parameters such as the film span length, thickness, elastic modulus and compressive force, to reveal the effects of the film parameter uncertainty on the buckling deformation. The results obtained illustrate the probabilistic relation between buckling deformation and uncertain parameters, and are useful for accurate and reliable buckling design in terms of probability.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001876236
|
oai_dc
|
Contact forces generated by fallen debris
|
Contact forces generated by fallen debris
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Jing Sun(University of Melbourne); Nelson Lam(University of Melbourne); Lihai Zhang(University of Melbourne); Emad Gad(Swinburne University of Technology); Dong Ruan(Swinburne University of Technology)"
] |
Expressions for determining the value of the impact force as reported in the literature and incorporated into code provisions are essentially quasi-static forces for emulating deflection. Quasi-static forces are not to be confused with contact force which is generated in the vicinity of the point of contact between the impactor and target, and contact force is responsible for damage featuring perforation and denting. The distinction between the two types of forces in the context of impact actions is not widely understood and few guidelines have been developed for their estimation. The value of the contact force can be many times higher than that of the quasi-static force and lasts for a matter of a few milli-seconds whereas the deflection of the target can evolve over a much longer time span. The stiffer the impactor the shorter the period of time to deliver the impulsive action onto the target and consequently the higher the peak value of the contact force. This phenomenon is not taken into account by any contemporary codified method of modelling impact actions which are mostly based on the considerations of momentum and energy principles. Computer software such as LS-DYNA has the capability of predicting contact force but the dynamic stiffness parameters of the impactor material which is required for input into the program has not been documented for debris materials. The alternative, direct, approach for an accurate evaluation of the damagepotential of an impact scenario is by physical experimentation. However, it can be difficult to extrapolate observations from laboratory testings to behaviour in real scenarios when the underlying principles have not been established. Contact force is also difficult to measure. Thus, the amount of useful information that can be retrieved from isolated impact experiments to guide design and to quantify risk is very limited. In this paper, practical methods for estimating the amount of contact force that can be generated by the impact of a fallen debris object are introduced along with the governing principles. An experimental-calibration procedure forming part of the assessment procedure has also been verified.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001955540
|
oai_dc
|
Fatigue behavior of concrete beams reinforced with HRBF500 steel bars
|
Fatigue behavior of concrete beams reinforced with HRBF500 steel bars
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ke Li(Southeast University); Xin-Ling Wang(Zhengzhou University); Shuang-Yin Cao(Southeast University); Qing-Ping Chen(Kaifeng University)"
] |
The purpose of this study was to investigate experimentally the fatigue performance of reinforced concrete (RC) beams with hot-rolled ribbed fine-grained steel bars of yielding strength 500MPa (HRBF500). Three rectangular and three T-section RC beams with HRBF500 bars were constructed and tested under static and constant-amplitude cyclic loading. Prior to the application of repeated loading, all beams were initially cracked under static loading. The major test variables were the steel ratio, crosssectionalshape and stress range. The stress evolution of HRBF500 bars, the information about crack growth and the deflection developments of test beams were presented and analyzed. Rapid increases in deflections and tension steel stress occured in the early stages of fatigue loading, and were followed by a relatively stable period. Test results indicate that, the concrete beams reinforced with appropriate amount of HRBF500 bars can survive 2.5 million cycles of constant-amplitude cyclic loading with no apparent signs of damage, on condition that the initial extreme tensile stress in HRBF500 steel bars was controlled less than 150 MPa. It was also found that, the initial extreme tension steel stress, stress range, and steel ratio were the main factors that affected the fatigue properties of RC beams with HRBF500 bars, whose effects on fatigueproperties were fully discussed in this paper, while the cross-sectional shape had no significant influence in fatigue properties. The results provide important guidance for the fatigue design of concrete beams reinforced with HRBF500 steel bars.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001955544
|
oai_dc
|
Free vibration of functionally graded thin elliptic plates with various edge supports
|
Free vibration of functionally graded thin elliptic plates with various edge supports
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"K.K. Pradhan(National Institute of Technology Rourkela); S. Chakraverty(National Institute of Technology Rourkela)"
] |
In this article, free vibration of functionally graded (FG) elliptic plates subjected to various classical boundary conditions has been investigated. Literature review reveals no study has been performed based on functionally graded elliptic plates till date. The mechanical kinematic relations are considered based on classical plate theory. Rayleigh-Ritz technique is used to obtain the generalized eigenvalue problem. The material properties of the FG plate are assumed to vary along thickness direction of the constituents according to power-law form. Trial functions denoting the displacement components are expressed in simple algebraic polynomial forms which can handle any edge support. The objective is to study the effect of geometric configurations and gradation of constituent volume fractions on the natural frequencies. New results for frequency parameters are incorporated after performing a test of convergence. A comparison study is carried out with existing literature for validation in special cases. Three-dimensional mode shapes for circular and elliptic FG plates are also presented with various boundary conditions at the edges.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001955532
|
oai_dc
|
The stress analysis of a shear wall with matrix displacement method
|
The stress analysis of a shear wall with matrix displacement method
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Mustafa Ergun(Karadeniz Technical University); Sevket Ates(Karadeniz Technical University)"
] |
Finite element method (FEM) is an effective quantitative method to solve complex engineering problems. The basic idea of FEM for a complex problem is to be able to find a solution by reducing the problem made simple. If mathematical tools are inadequate to obtain precise result, even approximate result, FEM is the only method that can be used for structural analyses. In FEM, the domain is divided into a largenumber of simple, small and interconnected sub-regions called finite elements. FEM has been used commonly for linear and nonlinear analyses of different types of structures to give us accurate results of plane stress and plane strain problems in civil engineering area. In this paper, FEM is used to investigate stress analysis of a shear wall which is subjected to concentrated loads and fundamental principles of stress analysis of the shear wall are presented by using matrix displacement method in this paper. This study is consisting of two parts. In the first part, the shear wall is discretized with constant strain triangular finiteelements and stiffness matrix and load vector which is attained from external effects are calculated for each of finite elements using matrix displacement method. As to second part of the study, finite element analysis of the shear wall is made by ANSYS software program. Results obtained in the second part are presentedwith tables and graphics, also results of each part is compared with each other, so the performance of the matrix displacement method is demonstrated. The solutions obtained by using the proposed method show excellent agreements with the results of ANSYS. The results show that this method is effective and preferable for the stress analysis of shell structures. Further studies should be carried out to be able to prove the efficiency of the matrix displacement method on the solution of plane stress problems using different types of structures.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001955539
|
oai_dc
|
Disturbance analysis of hydropower station vertical vibration dynamic characteristics: the effect of dual disturbances
|
Disturbance analysis of hydropower station vertical vibration dynamic characteristics: the effect of dual disturbances
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Baoping Zhi(Dalian University of Technology); Zhenyue Ma(Dalian University of Technology)"
] |
The purpose of this work is to analyze the effect of structure parameter disturbance on the dynamic characteristics of a hydropower station powerhouse. A vibration model with a head-cover system isestablished, and then the general disturbance problem analysis methods are discussed. Two new formulaebased on two types of disturbances are developed from existing methods. The correctness and feasibility of these two formulae are validated by analyzing the hydropower station powerhouse vibration model. The appropriate calculation method for disturbance of the hydropower station powerhouse vibration dynamic characteristics is derived.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001955542
|
oai_dc
|
Study of ball bearing fatigue damage using vibration analysis: application to thrust ball bearings
|
Study of ball bearing fatigue damage using vibration analysis: application to thrust ball bearings
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Toumi M.Yessine(University of Reims Champagne-Ardenne); Bolaers Fabrice(University of Reims Champagne-Ardenne); Bogard Fabien(University of Reims Champagne-Ardenne); Murer Sébastien(University of Reims Champagne-Ardenne)"
] |
This paper presents a study based on the damage due to the fatigue life of thrust ball bearingsusing vibratory analysis. The main contribution of this work lies in establishing a relation between modaldamping and the rolling contact fatigue damage of the thrust ball bearing. Time domain signals andfrequency spectra are extracted from both static and dynamic experiments. The first part of this researchconsists in measuring the damping of damaged thrust ball bearings using impact hammer characterizationtests. In a second part, indented components representing spalled bearings are studied to determine theevolution of damping values in real-time vibration spectra using the random decrement method. Dynamicresults, in good agreement with static tests, show that damping varies depending on the component’s damagestate. Therefore, the method detailed in this work will offer a possible technique to estimate the thrust ballbearing fatigue damage variation in presence of spalling.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001955548
|
oai_dc
|
Structural joint modeling and identification: numerical and experimental investigation
|
Structural joint modeling and identification: numerical and experimental investigation
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Sanjay B. Ingole(Government Polytechnic); Animesh Chatterjee(Visvesvaraya National Institute of Technology)"
] |
In the present work, structural joints have been modeled as a pair of translational and rotationalsprings and frequency equation of the overall system has been developed using sub-structure synthesis. It isshown that using first few natural frequencies of the system, one can obtain a set of over-determined systemof equations involving the unknown stiffness parameters. Method of multi-linear regression is then appliedto obtain the best estimate of the unknown stiffness parameters. The estimation procedure has beendeveloped first for a two parameter joint model and then for a three parameter model, in which crosscoupling terms are also included. Two cases of structural connections have been considered, first with acantilever beam with support flexibility and then a pair of beams connected through lap joint. The validity ofthe proposed method is demonstrated through numerical simulation and by experimentation.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001955530
|
oai_dc
|
Experimental characterization of timber framed masonry walls cyclic behaviour
|
Experimental characterization of timber framed masonry walls cyclic behaviour
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ana Maria Gonçalves(Technical University of Lisbon from University of Lisbon); João Gomes Ferreira(Technical University of Lisbon from University of Lisbon); Luís Guerreiro(Technical University of Lisbon from University of Lisbon); Fernando Branco(Technical University of Lisbon from University of Lisbon)"
] |
After the large destruction of Lisbon due to the 1755 earthquake, the city had to be almost completely rebuilt. In this context, an innovative structural solution was implemented in new buildings,comprising internal timber framed walls which, together with the floors timber elements, constituted a 3-Dframing system, known as “cage”, providing resistance and deformation capacity for seismic loading. The internal timber framed masonry walls, in elevated floors, are constituted by a timber frame with vertical andhorizontal elements, braced with diagonal elements, known as Saint Andrew‟s crosses, with masonry infill.
This paper describes an experimental campaign to assess the in-plane cyclic behaviour of those so called “frontal” walls. A total series of 4 tests were conducted in 4 real size walls. Two models consist of the simple timber frames without masonry infill, and the other two specimens have identical timber frames but present masonry infill. Experimental characterization of the in-plane behaviour was carried out by static cyclic shear testing with controlled displacements. The loading protocol used was the CUREE for ordinary ground motions. The hysteretic behaviour main parameters of such walls subjected to cyclic loading were computed namely the initial stiffness, ductility and energy dissipation capacity.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001955533
|
oai_dc
|
Base isolation performance of a cone-type friction pendulum bearing system
|
Base isolation performance of a cone-type friction pendulum bearing system
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"전법규(부산대학교); 장성진(부산대학교); 김성완(부산대학교); 김남식(부산대학교)"
] |
A CFPBS (Cone-type Friction Pendulum Bearing System) was developed to control the acceleration delivered to a structure to prevent the damage and degradation of critical communication equipment during earthquakes. This study evaluated the isolation performance of the CFPBS by numerical analysis. The CFPBS was manufactured in the shape of a cone differenced with the existing FPS (Friction Pendulum System), and a pattern was engraved on the friction surface. The natural frequencies of the CFPBS were evaluated from a free-vibration test with a seismic isolator system consisting of 4 CFPBS. To confirm the earthquake-resistant performance, a numerical analysis program was prepared using the equation of the CFPBS induced from the equations of motion. The equation reported by Tsai for the rollingtype seismic isolation bearings was proposed to design the equation of the CFPBS. Artificial seismic waves that satisfy the maximum earthquake scale of the Korean Building Code-Structural (KBC-2005) were created and verified to review the earthquake-resistant performance of the CFPBS by numerical analysis. The superstructural mass of the CFPBS and the skew angle of friction surface were considered for numerical analysis with El Centro NS, Kobe NS and artificial seismic waves. The CFPBS isolation performance evaluation was based on the numerical analysis results, and comparative analysis was performed between the results from numerical analysis and simplified theoretical equation under the same conditions. The validity of numerical analysis was verified from the shaking table test.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001955534
|
oai_dc
|
Structural damage detection including the temperature difference based on response sensitivity analysis
|
Structural damage detection including the temperature difference based on response sensitivity analysis
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"J.J. Wei(Changzhou Institute of Engineering Technology); Z.R. Lv(Sun Yat-sen University)"
] |
Damage detection based on a reference set of measured data usually has the problem of different environmental temperature in the two sets of measurements, and the effect of temperature difference is usually ignored in the subsequent model updating. This paper attempts to identify the structural damage including the temperature difference with artificial measurement noise. Both local damages and the temperature difference are identified in a gradient-based model updating method based on dynamic response sensitivity. The sensitivities of dynamic response with respect to the system parameters and temperature difference are calculated by direct integration method. The measured dynamic responses of the structure from two different states are used directly to identify the structural local damages and the temperature difference. A single degree-of-freedom mass-spring system and a planar truss structure are studied to illustrate the effectiveness of the proposed method.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001955546
|
oai_dc
|
Assessment of infill wall topology contribution in the overall response of frame structures under seismic excitation
|
Assessment of infill wall topology contribution in the overall response of frame structures under seismic excitation
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"N. Nanos(University of Portsmouth); A. Elenas(Democritus University of Thrace)"
] |
This paper identifies the effects of infill wall existence and arrangement in the seismic response of steel frame structures. The methodology followed was based on the utilisation of overall seismic response indicators that distil the complexity of structural response in a single value henceenabling their straightforward comparative and statistical post process. The overall structure damageindex after Park/Ang (OSDIPA) and the maximum inter-story drift ratio (MISDR) have been selected as widely utilized structural seismic response parameters in contemporary state of art. In this respect a set of 225 Greek antiseismic code (EAK) spectrum compatible artificial accelerograms have been created and a series of non-linear dynamic analyses have been executed. Data were obtained through nonlineardynamic analyses carried on an indicative steel frame structure with 5 different infill wall topologies. Results indicated the significant overall contribution of infill walls with a reduction that ranged 35-47%of the maximum and 74-81% of the average recorded OSDIPA values followed by an overall reductionof 64-67% and 58-61% for the respective maximum and average recorded MISDR values demonstrating the relative benefits of infill walls presence overall as well as localised with similar reductions observed in 1st level damage indicators.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001955536
|
oai_dc
|
Structural damage and force identification under moving load
|
Structural damage and force identification under moving load
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Hongping Zhu(Huazhong University of Science and Technology); Ling Mao(Huazhong University of Science and Technology); Shun Weng(Huazhong University of Science and Technology); Yong Xia(The Hong Kong Polytechnic Unversity)"
] |
Structural damage and moving load identification are the two aspects of structural system identification. However, they universally coexist in the damaged structures subject to unknown moving load.
This paper proposed a dynamic response sensitivity-based model updating method to simultaneously identify the structural damage and moving force. The moving force which is equivalent as the nodal force of the structure can be expressed as a series of orthogonal polynomial. Based on the system Markov parameters by the state space method, the dynamic response and the dynamic response derivatives with respect to the force parameters and elemental variations are analytically derived. Afterwards, the damage and force parameters are obtained by minimizing the difference between measured and analytical response in the sensitivity-based updating procedure. A numerical example for a simply supported beam under the moving load is employed to verify the accuracy of the proposed method.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001955538
|
oai_dc
|
Wave propagation in fibre-reinforced anisotropic thermoelastic medium subjected to gravity field
|
Wave propagation in fibre-reinforced anisotropic thermoelastic medium subjected to gravity field
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"A.M. Abd-Alla(Taif University); S.M. Abo-Dahab(Taif University); F.S. Bayones(Taif University)"
] |
The objective of this paper is to investigate the surface waves in fibre-reinforced anisotropic thermoelastic medium subjected to gravity field. The theory of generalized surface waves has firstly developed and then it has been employed to investigate particular cases of waves, viz., Stoneley waves, Rayleigh waves and Love waves. The analytical expressions for displacement components, force stress and temperature distribution are obtained in the physical domain by using the harmonic vibrations. The wavevelocity equations have been obtained in different cases. The numerical results are given and presentedgraphically in Green-Lindsay and Lord-Shulman theory of thermoelasticity. Comparison was made with the results obtained in the presence and absence of gravity, anisotropy, relaxation times and parameters for fibrereinforced of the material medium. The results indicate that the effect of gravity, anisotropy, relaxation times and parameters for fibre-reinforced of the material medium are very pronounced.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001911616
|
oai_dc
|
Influence of structural system measures on the dynamic characteristics of a multi-span cable-stayed bridge
|
Influence of structural system measures on the dynamic characteristics of a multi-span cable-stayed bridge
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Fangfang Geng(Southeast University); Youliang Ding(Southeast University); Hongen Xie(Southeast University); Jianyong Song(Research Institute of Highway Ministry of Transport); Wanheng Li(Research Institute of Highway Ministry of Transport)"
] |
A three-dimensional finite element model for the Jiashao Bridge, the longest multi-span cablestayed bridge in the world, is established using the commercial software package ANSYS. Dynamic characteristics of the bridge are analyzed and the effects of structural system measures including the rigid hinge, auxiliary piers and longitudinal constraints between the girders and side towers on the dynamic properties including modal frequency, mode shape and effective mass are studied by referring to the Jiashao Bridge. The analysis results reveal that: (i) the installation of the rigid hinge significantly reduces the modal frequency of the first symmetric lateral bending mode of bridge deck. Moreover, the rigid hinge significantly changes the mode shape and effective mass of the first symmetric torsional mode of bridge deck; (ii) the layout of the auxiliary piers in the side-spans has a limited effect on changing the modal frequencies, mode shapes and effective masses of global vibration modes; (iii) the employment of the longitudinal constraints significantly increases the modal frequencies of the vertical bending modes and lateral bending modes of bridge deck and have significant effects on changing the mode shapes of vertical bending modes and lateral bending modes of bridge deck. Moreover, the effective mass of the first anti-symmetric vertical bending of bridge deck in the longitudinal direction of the fully floating system is significantly larger than that of the partially constrained system and fully constrained system. The results obtained indicate that the structural system measures of the multi-span cable-stayed bridge have a great effect on the dynamic properties, which deserves special attention for seismic design and wind-resistant design of the multi-span cable-stayed bridge.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001911613
|
oai_dc
|
Theoretical and experimental study of robustness based design of single-layer grid structures
|
Theoretical and experimental study of robustness based design of single-layer grid structures
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Hui Wu(Zhejiang University of Finance & Economics); Cheng Zhang(East China Electric Power Design Institute); Bo-qing Gao(Zhejiang University); Jun Ye(Zhejiang University)"
] |
Structural robustness refers to the ability of a structure to avoid disproportionate consequences to the original cause. Currently attentions focus on the concepts of structural robustness, and discussions onmethods of robustness based structural design are rare. Firstly, taking basis in robust H∞ control theory,structural robustness is assessed by H∞ norm of the system transfer function. Then using the SIMP material model, robustness based design of grid structures is formulated as a continuum topology optimization problem, where the relative density of each element and structural robustness are considered as the design variable and the optimization objective respectively. Generalized elitist genetic algorithm is used to solve the optimization problem. As examples, robustness configurations of plane stress model and the rectangular hyperbolic shell model were obtained by robustness based structural design. Finally, two models of single-layer grid structures were designed by conventional and robustness based method respectively. Different interference scenarios were simulated by static and impact experiments, and robustness of the models were analyzed and compared. The results show that the H∞ structural robustness index can indicate whether the structural response is proportional to the original cause. Robustness based structural design improves structural robustness effectively, and it can provide a conceptual design in the initial stage of structural design.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001911619
|
oai_dc
|
An apt material model for drying shrinkage and specific creep of HPC using artificial neural network
|
An apt material model for drying shrinkage and specific creep of HPC using artificial neural network
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Banti A. Gedam(Indian Institute of Technology - Roorkee); N.M. Bhandari(Indian Institute of Technology - Roorkee); Akhil Upadhyay(Indian Institute of Technology - Roorkee)"
] |
In the present work appropriate concrete material models have been proposed to predict drying shrinkage and specific creep of High-performance concrete (HPC) using Artificial Neural Network (ANN). The ANN models are trained, tested and validated using 106 different experimental measured set of data collected from different literatures. The developed models consist of 12 input parameters which include quantities of ingredients namely ordinary Portland cement, fly ash, silica fume, ground granulated blastfurnace slag, water, and other aggregate to cement ratio, volume to surface area ratio, compressive strength at age of loading, relative humidity, age of drying commencement and age of concrete. The Feed-forward backpropagation networks with Levenberg-Marquardt training function are chosen for proposed ANN models and same implemented on MATLAB platform. The results shows that the proposed ANN models are more rational as well as computationally more efficient to predict time-dependent properties of drying shrinkage and specific creep of HPC with high level accuracy.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001911624
|
oai_dc
|
A modified multidisciplinary feasible formulation for MDO using integrated coupled approximate models
|
A modified multidisciplinary feasible formulation for MDO using integrated coupled approximate models
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"최은호(부산대학교); 조진래(부산대학교); 임오강(부산대학교)"
] |
This paper is concerned with the modification of multidisciplinary feasible formulation for MDO problems using the integrated coupled approximate models. A drawback of conventional MDFs is thenumerical difficulty in decomposing the design variables and deriving the coupled equations of state. To overcome such a drawback of conventional methods, the coupling in analysis and design is resolved by approximating the state variables in each discipline by the response surface method and by modifying the optimization formulation using the corresponding integrated coupled approximate models. The validity, reliability and effectiveness of the proposed method are illustrated and verified through two optimization problems, a mathematical MDF problem and the multidisciplinary optimum design of suspension unit of wheeled armored vehicle.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001911622
|
oai_dc
|
Damage identification of 2D and 3D trusses by using complete and incomplete noisy measurements
|
Damage identification of 2D and 3D trusses by using complete and incomplete noisy measurements
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"M. Rezaiee-Pajand(Ferdowsi University of Mashhad); M.S. Kazemiyan(Ferdowsi University of Mashhad)"
] |
Four algorithms for damage detection of trusses are presented in this paper. These approaches can detect damage by using both complete and incomplete measurements. The suggested methods are based on the minimization of the difference between the measured and analytical static responses of structures. A non-linear constrained optimization problem is established to estimate the severity and location of damage. To reach the responses, the successive quadratic method is used. Based on the objective function, thestiffness matrix of the truss should be estimated and inverted in the optimization procedure. The differences of the proposed techniques are rooted in the strategy utilized for inverting the stiffness matrix of the damaged structure. Additionally, for separating the probable damaged members, a new formulation is proposed. This scheme is employed prior to the outset of the optimization process. Furthermore, a new tactic is presented to select the appropriate load pattern. To investigate the robustness and efficiency of the authors’ method, several numerical tests are performed. Moreover, Monte Carlo simulation is carried out to assess the effect of noisy measurements on the estimated parameters.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001911623
|
oai_dc
|
Dynamic analysis of bridge girders submitted to an eccentric moving load
|
Dynamic analysis of bridge girders submitted to an eccentric moving load
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ricardo F. Vieira(Universidade de Lisboa); Diego Lisi(Universidade de Lisboa); Francisco B. Virtuoso(Universidade de Lisboa)"
] |
The cross-section warping due to the passage of high-speed trains can be a relevant issue to consider in the dynamic analysis of bridges due to (i) the usual layout of railway systems, resulting in eccentric moving loads; and (ii) the use of cross-sections prone to warping deformations. A thin-walled beam formulation for the dynamic analysis of bridges including the cross section warping is presented in this paper. Towards a numerical implementation of the beam formulation, a finite element with seven degrees of freedom is proposed. In order to easily consider the compatibility between elements, and since the coupling between flexural and torsional effects occurs in non-symmetric cross-sections due to dynamic effects, a single axis is considered for the element. The coupled flexural-torsional free vibration of thin-walled beams is analysed through the presented beam model, comparing the results with analytical solutions presented in the literature. The dynamic analysis due to an eccentric moving load, which results in a coupled flexuraltorsional vibration, is considered in the literature by analytical solutions, being therefore of a limited applicability in practice engineering. In this paper, the dynamic response due to an eccentric moving load is obtained from the proposed finite element beam model that includes warping by a modal analysis.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001911618
|
oai_dc
|
Buckling of an elastic plate due to surface-attached thin films with intrinsic stresses
|
Buckling of an elastic plate due to surface-attached thin films with intrinsic stresses
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"J. Zhu(Zhejiang University of Technology); J.S. Yang(University of Nebraska); C.Q. Ru(University of Alberta)"
] |
We analyze the buckling of a thin elastic plate due to intrinsic stresses in thin films attached to the surfaces of the plate. In the case of cylindrical buckling, it is shown that for a plate with clamped edges compressive intrinsic film stresses can cause flexural buckling of the plate, while tensile intrinsic film stresses cannot. For a plate with free edges, film intrinsic stresses, compressive or tensile, cannot cause buckling.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001911621
|
oai_dc
|
Failure analysis of composite plates under static and dynamic loading
|
Failure analysis of composite plates under static and dynamic loading
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Chaitali Ray(Indian Institute of Engineering Science and Technology); Somnath Majumder(Indian Institute of Engineering Science and Technology)"
] |
The present paper deals with the first ply failure analysis of the laminated composite plates under various static and dynamic loading conditions. Static analysis has been carried out under patch load and triangular load. The dynamic failure analysis has been carried out under triangular pulse load. The formulation has been carried out using the finite element method and a computer code has been developed. The first order shear deformation theory has been applied in the present formulation. The displacement time history analysis of laminated composite plate has been carried out and the results are compared with those published in literature to validate the formulation. The first ply failure load for laminated composite plates with various lamination schemes under static and dynamic loading conditions has been calculated using various failure criteria. The failure index-time history analysis has also been carried out and presented in this paper.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001911617
|
oai_dc
|
Theoretical tensile model and cracking performance analysis of laminated rubber bearings under tensile loading
|
Theoretical tensile model and cracking performance analysis of laminated rubber bearings under tensile loading
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Shicai Chen(Beijing University of Technology); Tongya Wang(Beijing University of Technology); Weiming Yan(Beijing University of Technology); Zhiqian Zhang(Beijing University of Technology); 김강석(Tsinghua University)"
] |
To analyze the tension performance of laminated rubber bearings under tensile loading, a theoretical tension model for analyzing the rubber bearings is proposed based on the theory of elasticity. Applying the boundary restraint condition and the assumption of incompressibility of the rubber (Poisson’s ratio of the rubber material is about 0.5 according the existing research results), the stress and deformation expressions for the tensile rubber layer are derived. Based on the derived expressions, the stress distribution and deformation pattern especially for the deformation shapers of the free edges of the rubber layer are analyzed and validated with the numerical results, and the theory of cracking energy is applied to analyze the distributions of prediction cracking energy density and gradient direction. The prediction of crack initiation and crack propagation direction of the rubber layers is investigated. The analysis results show that the stressand deformation expressions can be used to simulate the stress distribution and deformation pattern of the rubber layer for laminated rubber bearings in the elastic range, and the crack energy method of predicting failure mechanism are feasible according to the experimental phenomenon.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001911620
|
oai_dc
|
Vibration analysis of laminated plates with various boundary conditions using extended Kantorovich method
|
Vibration analysis of laminated plates with various boundary conditions using extended Kantorovich method
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Pairod Singhatanadgid(Chulalongkorn University); Thanawut Wetchayanon(Chulalongkorn University)"
] |
In this study, an extended Kantorovich method, employing multi-term displacement functions, is applied to analyze the vibration problem of symmetrically laminated plates with arbitrary boundary conditions. The vibration behaviors of laminated plates are determined based on the variational principle of total energy minimization and the iterative Kantorovich method. The out-of-plane displacement is represented in the form of a series of a sum of products of functions in x and y directions. With a known function in the x or y directions, the formulation for the variation of total potential energy is transformed to a set of governing equations and a set of boundary conditions. The equations and boundary conditions are then numerically solved for the natural frequency and vibration mode shape. The solutions are verified with available solutions from the literature and solutions from the Ritz and finite element analysis. In most cases, the natural frequencies compare very well with the reference solutions. The vibration mode shapes are also very well modeled using the multi-term assumed displacement function in the terms of a power series. With the method used in this study, it is possible to solve the angle-ply plate problem, where the Kantorovich method with single-term displacement function is ineffective.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001911612
|
oai_dc
|
A penny-shaped interfacial crack between piezoelectric layer and elastic half-space
|
A penny-shaped interfacial crack between piezoelectric layer and elastic half-space
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"J.H. Ren(Hebei University of Engineering); Y.S. Li(Hebei University of Engineering); W. Wang(Hebei University of Engineering)"
] |
An interfacial penny-shaped crack between piezoelectric layer and elastic half-space subjected to mechanical and electric loads is investigated. Using Hankel transform technique, the mixed boundary value problem is reduced to a system of singular integral equations. The integral equations are further reduced to a system of algebraic equations with the aid of Jacobi polynomials. The stress intensity factor and energy release rate are determined. Numerical results reveal the effects of electric loadings and material parameters of composite on crack propagation and growth. The results seem useful for design of the piezoelectric composite structures and devices of high performance.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001911614
|
oai_dc
|
A study of deterioration of reinforced concrete beams under various forms of simulated acid rain attack in the laboratory
|
A study of deterioration of reinforced concrete beams under various forms of simulated acid rain attack in the laboratory
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Yingfang Fan(Dalian Maritime University); Zhiqiang Hu(Dalian University of Technology); Haiyang Luan(Dalian Maritime University); Dawei Wang(Dalian Maritime University); An Chen(University of Idaho)"
] |
This paper studies the behaviour of deteriorated reinforced concrete (RC) beams attacked by various forms of simulated acid rain. An artificial rainfall simulator was firstly designed and evaluated. Eleven RC beams (120 mm×200 mm×1800 mm) were then constructed in the laboratory. Among them, one was acting as a reference beam and the others were subjected to three accelerated corrosion methods, including immersion, wetting-drying, and artificial rainfall methods, to simulate the attack of real acid rain. Acid solutions with pH levels of 1.5 and 2.5 were considered. Next, ultrasonic, scanning electron microscopy (SEM), dynamic, and three-point bending tests were performed to investigate the mechanical properties of concrete and flexural behaviour of the RC beams. It can be concluded that the designed artificial simulator can be effectively used to simulate the real acid rainfall. Both the immersion and wetting-drying methods magnify the effects of the real acid rainfall on the RC beams.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001922602
|
oai_dc
|
Semi-analytical numerical approach for the structural dynamic response analysis of spar floating substructure for offshore wind turbine
|
Semi-analytical numerical approach for the structural dynamic response analysis of spar floating substructure for offshore wind turbine
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"조진래(부산대학교); 김보성(부산대학교); 최은호(부산대학교); 이시복(부산대학교); 임오강(부산대학교)"
] |
A semi-analytical numerical approach for the effective structural dynamic response analysis of spar floating substructure for offshore wind turbine subject to wave-induced excitation is introduced in this paper. The wave-induced rigid body motions at the center of mass are analytically solved using the dynamic equations of rigid ship motion. After that, the flexible structural dynamic responses of spar floating substructure for offshore wind turbine are numerically analyzed by letting the analytically derived rigid body motions be the external dynamic loading. Restricted to one-dimensional sinusoidal wave excitation at sea state 3, pitch and heave motions are considered. Through the numerical experiments, the time responses of heave and pitch motions are solved and the wave-induced dynamic displacement and effective stress of flexible floating substructure are investigated. The hydrodynamic interaction between wave and structure is modeled by means of added mass and wave damping, and its modeling accuracy is verified from the comparison of natural frequencies obtained by experiment with a 1/100 scale model.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001922597
|
oai_dc
|
Flexural behavior of reinforced lightweight concrete beams under reversed cyclic loading
|
Flexural behavior of reinforced lightweight concrete beams under reversed cyclic loading
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Li-Kai Chien(National Central University); Yi-Hao Kuo(National Chung-Hsing University); Chung-Ho Huang(National Taipei University of Technology); How-Ji Chen(National Chung-Hsing University); Ping-Hu Cheng(National Central University)"
] |
This paper presents the results of an experimental investigation on the flexural behavior of doubly reinforced lightweight concrete (R.L.C.) beams tested under cyclic loading. A total of 20 beam specimens were tested. Test results are presented in terms of ductility index, the degradation of strength and stiffness, and energy dissipation. The flexural properties of R.L.C. beam were compared to those of normal concrete (R.C.) beams. Test results show that R.L.C. beam with low and medium concrete strength (20, 40MPa) performed displacement ductility similar to the R.C. beam. The ductility can be improved by enhancing the concrete strength or decreasing the tension reinforcement ratio. Using lightweight aggregate in concrete is advantageous to the dynamic stiffness of R.L.C. beam. Enhancement of concrete strength and increase of reinforcement ratio will lead to increase of the stiffness degradation of beam. The energy dissipation of R.L.C beam, similar to R.C. beam, increase with the increase of tension reinforcement ratio. The energy dissipation of unit load cycle for smaller tension reinforcement ratio is relatively less than that of beam with higher reinforcement ratio.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001922591
|
oai_dc
|
A new PSRO algorithm for frequency constraint truss shape and size optimization
|
A new PSRO algorithm for frequency constraint truss shape and size optimization
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"A. Kaveh(Iran University of Science and Technology); A. Zolghadr(Iran University of Science and Technology)"
] |
In this paper a new particle swarm ray optimization algorithm is proposed for truss shape and size optimization with natural frequency constraints. These problems are believed to represent nonlinear and non-convex search spaces with several local optima and therefore are suitable for examining the capabilities of new algorithms. The proposed algorithm can be viewed as a hybridization of Particle Swarm Optimization (PSO) and the recently proposed Ray Optimization (RO) algorithms. In fact the exploration capabilities of the PSO are tried to be promoted using some concepts of the RO. Five numerical examples are examined in order to inspect the viability of the proposed algorithm. The results are compared with those of the PSO and some other existing algorithms. It is shown that the proposed algorithm obtains lighter structures in comparison to other methods most of the time. As will be discussed, the algorithm's performance can be attributed to its appropriate exploration/exploitation balance.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001922600
|
oai_dc
|
The flexural performance of laminated glass beams under elevated temperature
|
The flexural performance of laminated glass beams under elevated temperature
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Xiaokun Huang(China Academy of Building Research); Gang Liu(China Academy of Building Research); Qiang Liu(China Academy of Building Research); Stephen J. Bennison(E.I. DuPont de Nemours & Co. Inc)"
] |
A series of experimental work is carried out with the aim to understand the flexural performance of laminated glass (LG) beams using polyvinyl butyral (PVB) and Ionoplast interlayers subjected to short term duration loads in the circumstance of elevated temperature. The study is based on a total of 42 laboratory tests conducted in ambient temperature ranging from 25°C to 80°C. The load duration is kept within 20 seconds. Through the tests, load-stress and load-deflection curves of the LG are established; appropriate analytical models for the LG are indentified; the effective thicknesses as well as the shear transfer coefficients of the LG are semi-empirically determined. The test results show that within the studied temperature range the bending stresses and deflections at mid-span of the LG develop linearly with respect to the applied loads. From 25°C to 80°C the flexural behavior of the PVB LG is found constantly between that of monolithic glass and layered glass having the same nominal thickness; the flexural behavior of the Ionoplast LG is equivalent to monolithic glass of the same nominal thickness until the temperature elevates up to 50°C. The test results reveal that in calculating the effective thicknesses of the PVB and Ionoplast LG, neglecting the shear capacities of the interlayers is uneconomic even when the ambient temperature is as high as 80°C. In the particular case of this study, the shear transfer coefficient of the PVB interlayer is found in a range from 0.62 to 0.14 while that of the Ionoplast interlayer is found in a range from 1.00 to 0.56 when the ambient temperature varies from 25°C to 80°C.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001922598
|
oai_dc
|
Pounding between adjacent buildings of varying height coupled through soil
|
Pounding between adjacent buildings of varying height coupled through soil
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Sadegh Naserkhaki(University of Alberta); Marwan El-Rich(University of Alberta); Farah N.A. Abdul Aziz(Universiti Putra Malaysia); Hassan Pourmohammad(Islamic Azad University)"
] |
Pounding between adjacent buildings is a significant challenge in metropolitan areas because buildings of different heights collide during earthquake excitations due to varying dynamic properties and narrow separation gaps. The seismic responses of adjacent buildings of varying height, coupled through soil subjected to earthquake-induced pounding, are evaluated in this paper. The lumped mass model is used to simulate the buildings and soil, while the linear visco-elastic contact force model is used to simulatepounding forces. The results indicate while the taller building is almost unaffected when the shorter building is very short, it suffers more from pounding with increasing height of the shorter building. The shorter building suffers more from the pounding with decreasing height and when its height differs substantially from that of the taller building. The minimum required separation gap to prevent pounding is increased with increasing height of the shorter building until the buildings become almost in-phase. Considering the soil effect; pounding forces are reduced, displacements and story shears are increased after pounding, and also, minimum separation gap required to prevent pounding is increased.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001922599
|
oai_dc
|
Construction of the shape functions of beam vibrations for analysis of the rectangular plates by Kantorovich-Vlasov’s method
|
Construction of the shape functions of beam vibrations for analysis of the rectangular plates by Kantorovich-Vlasov’s method
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Emmanuel E.T. Olodo(University of Abomey-Calavi); Gerard Degan(University of Abomey-Calavi)"
] |
For analysis of the plates and membranes by numerical or analytical methods, the question of choice of the system of functions satisfying the different boundary conditions remains a major challenge to address. It is to this issue that is dedicated this work based on an approach of choice of combinations of trigonometric functions, which are shape functions of a bended beam with the boundary conditions corresponding to the plate support mode. To do this, the shape functions of beam vibrations for strength analysis of the rectangular plates by Kantorovich-Vlasov’s method is considered.Using the properties of quasi-orthogonality of those functions allowed assessing to differential equation for every member of the series. Therefore it’s proposed some new forms of integration of the beam functions, in order to simplify the problem.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001922592
|
oai_dc
|
Performance analysis of spherical indentation process during loading and unloading - a contact mechanics approach
|
Performance analysis of spherical indentation process during loading and unloading - a contact mechanics approach
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"V. C. Sathish Gandhi(University College of Engineering Ariyalur); R. Kumaravelan(Velalar College of Engineering and Technology); S. Ramesh(Vel Tech High Tech Dr. Rangarajan Dr. Sakunthala Engineering College)"
] |
In an indentation approach, the smooth rigid spherical ball penetrated into a deformable flat is considered for the study based on contact mechanics approach. The elastic-plastic frictionless spherical indentation analysis has been under taken in the finite element analysis using „ABAQUS‟ and experimental study. The spherical indentation has been studied for the materials like steel, aluminium, copper and brass with an identical spherical indenter for diverse indentation depths. The springback analysis is executed for studying the actual indentation depth after the indenter is unloaded. In the springback simulation, the material recovers its elastic deformation after the indenter is unloaded. The residual diameter and depth of an indentation for various materials are measured and compared with simulation results. It shows a good agreement between the simulation and an experimental studies.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001922594
|
oai_dc
|
Ultimate bearing capacity of conical shell foundations
|
Ultimate bearing capacity of conical shell foundations
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"J.E. Colmenares(Universidad Nacional de Colombia); 강소라(Midas IT); 신영진((주)삼성물산 건설부문); 신종호(건국대학교)"
] |
Shell foundations have been employed as an alternative for the conventional flat shallow foundations and have proven to provide economical advantage. They have shown considerably improved performance in terms of ultimate capacity and settlement characteristics. However, despite conical shell foundations are frequently used in industry, the theoretical solutions for bearing capacity of these footings are available for only triangular shell strip foundations. The benefits in design aspects can be achieved through theoretical solutions considering shell geometry. The engineering behavior of a conical shell foundation on mixed soils was investigated experimentally and theoretically in this study. The failure mechanism was obtained by conducting laboratory model tests. Based on that, the theoretical solution of bearing capacity was developed and validated with experimental results, in terms of the internal angle of the cone. In comparison to the circular flat foundation, the results show 15% increase of ultimate load and 51% decrease of settlement at an angle of intersection of 120°. Based on the results, the design chart of modified bearing capacity coefficients for conical shell foundation is proposed.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001922595
|
oai_dc
|
Moment Lyapunov exponents of the Parametrical Hill’s equation under the excitation of two correlated wideband noises
|
Moment Lyapunov exponents of the Parametrical Hill’s equation under the excitation of two correlated wideband noises
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Goran Janevski(University of Niš); Predrag Kozić(University of Niš); Ivan Pavlović(University of Niš)"
] |
The Lyapunov exponent and moment Lyapunov exponents of Hill’s equation with frequency and damping coefficient fluctuated by correlated wideband random processes are studied in this paper. The method of stochastic averaging, both the first-order and the second-order, is applied. The averaged Itô differential equation governing the pth norm is established and the pth moment Lyapunov exponents and Lyapunov exponent are then obtained. This method is applied to the study of the almost-sure and the moment stability of the stationary solution of the thin simply supported beam subjected to time-varying axial compressions and damping which are small intensity correlated stochastic excitations. The validity of the approximate results is checked by the numerical Monte Carlo simulation method for this stochastic system.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001922601
|
oai_dc
|
Ultimate strength performance of Northern Sea going non-ice class commercial ships
|
Ultimate strength performance of Northern Sea going non-ice class commercial ships
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"박대겸(부산대학교); 백점기(부산대학교); 김봉주(부산대학교); 서정관(부산대학교); 이천광(부산대학교); 김도균(포항공과대학교)"
] |
In the early design stage of ships, the two most important structural analyses are performed to identify the structural capacity and safety. The first step is called global strength analysis (longitudinal strength analysis or hull girder strength analysis) and the second step is local buckling analysis (stiffened panel strength analysis). This paper deals with the ultimate strength performance of Arctic sea route-going commercial ships considering the effect of low temperature. In this study, two types of structural analyses are performed in Arctic sea conditions. Three types of ship namely oil tanker, bulk carrier and container ship with four different sizes (in total 12 vessels) are tested in four low temperatures (−20, −40, −60 and −80°C), which are based on the Arctic environment and room temperature (20°C). The ultimate strength performance is analysed with ALPS/HULL progressive hull collapse analysis code for ship hulls, then ALPS/ULSAP supersize finite element method for stiffened panels. The obtained results are summarised in terms of temperature, vessel type, vessel size, loading type and other effects. The important insights and outcomes are documented.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001922593
|
oai_dc
|
Wind-induced responses and equivalent static wind loads of tower-blade coupled large wind turbine system
|
Wind-induced responses and equivalent static wind loads of tower-blade coupled large wind turbine system
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"S.T. Ke(Nanjing University of Aeronautics and Astronautics); T.G. Wang(Nanjing University of Aeronautics and Astronautics); Y.J. Ge(Tongji University); Y. Tamura(Tokyo Polytechnic University)"
] |
This study aimed to develop an approach to accurately predict the wind models and wind effects of large wind turbines. The wind-induced vibration characteristics of a 5 MW tower-blade coupled wind turbine system have been investigated in this paper. First, the blade-tower integration model was established, which included blades, nacelle, tower and the base of the wind turbine system. The harmonic superposition method and modified blade element momentum theory were then applied to simulate the fluctuating wind field for the rotor blades and tower. Finally, wind-induced responses and equivalent static wind loads (ESWL) of the system were studied based on the modified consistent coupling method, which took into account coupling effects of resonant modes, cross terms of resonant and background responses. Furthermore, useful suggestions were proposed to instruct the wind resistance design of large wind turbines. Based on obtained results, it is shown from the obtained results that wind-induced responses and ESWL were characterized with complicated modal responses, multi-mode coupling effects, and multiple equivalent objectives. Compared with the background component, the resonant component made more contribution to wind-induced responses and equivalent static wind loads at the middle-upper part of the tower and blades, and cross terms between background and resonant components affected the total fluctuation responses, while the background responses were similar with the resonant responses at the bottom of tower.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001922596
|
oai_dc
|
Seismic rehabilitation of RC frame using epoxy injection technique tested on shaking table
|
Seismic rehabilitation of RC frame using epoxy injection technique tested on shaking table
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Jiangtao Yu(Tongji University); Yuanmiao Zhang(Tongji University); Zhoudao Lu(Tongji University)"
] |
A 1/4-scale two-bay eight-storey reinforced concrete frame was tested on shaking table. Initial shaking table tests were carried out through a set of real seismic excitations to investigate the seismic behavior of the RC frame. Subsequently, the damaged frame was repaired using epoxy injection technique, and then subjected to the tests with the same records. The purpose of this study was to investigate experimentally the dynamic characteristics, cracking pattern and lateral inter-story stiffness of RC frames using epoxy injection technique. The test results indicate that epoxy-injection technique appears to be a satisfactory method for repairing earthquake-damaged structure.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001960378
|
oai_dc
|
Seismic response of current RC buildings in Kathmandu Valley
|
Seismic response of current RC buildings in Kathmandu Valley
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Hemchandra Chaulagain(University of Aveiro); Hugo Rodrigues(Polytechnic Institute of Leiria); Enrico Spacone(University of Chieti-Pescara); Humberto Varum(University of Porto)"
] |
RC buildings constitute the prevailing type of construction in earthquake-prone region like Kathmandu Valley. Most of these building constructions were based on conventional methods. In this context, the present paper studied the seismic behaviour of existing RC buildings in Kathmandu Valley. For this, four representative building structures with different design and construction, namely a building: (a) representing the non-engineered construction (RC1 and RC2) and (b) engineered construction (RC3 and RC4) has been selected for analysis. The dynamic properties of the case study building models are analyzed and the corresponding interaction with seismic action is studied by means of non-linear analyses. The structural response measures such as capacity curve, inter-storey drift and the effect of geometric nonlinearities are evaluated for the two orthogonal directions. The effect of plan and vertical irregularity on the performance of the structures was studied by comparing the results of two engineered buildings. This was achieved through non-linear dynamic analysis with a synthetic earthquake subjected to X, Y and 45° loading directions. The nature of the capacity curve represents the strong impact of the P-delta effect, leading to a reduction of the global lateral stiffness and reducing the strength of the structure. The non-engineered structures experience inter-storey drift demands higher than the engineered building models. Moreover, these buildings have very low lateral resistant, lesser the stiffness and limited ductility. Finally, a seismic safety assessment is performed based on the proposed drift limits. Result indicates that most of the existing buildings in Nepal exhibit inadequate seismic performance.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001960363
|
oai_dc
|
Thermoelastic analysis for a slab made of a thermal diode-like material
|
Thermoelastic analysis for a slab made of a thermal diode-like material
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Feras H. Darwish(Jordan University of Science and Technology); Mohammad A. Al-Nimr(Jordan University of Science and Technology); Mohammad I. Hatamleh(Jordan University of Science and Technology)"
] |
This research investigates the thermoelastic transient behavior of a thermally loaded slab made of a thermal diode-like material which has two directional thermal conductivity values (low and high). Finite difference analysis is used to obtain the elastic response of the slab based on the temperature solutions. It is found that the rate of heat transfer through the thickness of the slab decreases with reducing the ratiobetween the low and high thermal conductivity values (R). In addition, reducing R makes the slab less responsive to the thermal load when heated from the direction associated with the low thermal conductivity value.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001960365
|
oai_dc
|
Large deformation bending analysis of functionally graded spherical shell using FEM
|
Large deformation bending analysis of functionally graded spherical shell using FEM
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Vishesh Ranjan Kar(National Institute of Technology); Subrata Kumar Panda(National Institute of Technology)"
] |
In this article, nonlinear finite element solutions of bending responses of functionally graded spherical panels are presented. The material properties of functionally graded material are graded in thickness direction according to a power-law distribution of volume fractions. A general nonlinear mathematical shallow shell model has been developed based on higher order shear deformation theory by taking the geometric nonlinearity in Green-Lagrange sense. The model is discretised using finite element steps and the governing equations are obtained through variational principle. The nonlinear responses are evaluated through a direct iterative method. The model is validated by comparing the responses with the available published literatures. The efficacy of present model has also been established by demonstrating a simulation based nonlinear model developed in ANSYS environment. The effects of power-law indices, support conditions and different geometrical parameters on bending behaviour of functionally graded shells are obtained and discussed in detail.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001960367
|
oai_dc
|
Fracture analysis and remaining life prediction of aluminium alloy 2014a plate panels with concentric stiffeners under fatigue loading
|
Fracture analysis and remaining life prediction of aluminium alloy 2014a plate panels with concentric stiffeners under fatigue loading
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"A. Ramachandra Murthy(CSIR); Rakhi Sara Mathew(Saintgits College of Engineering); G.S. Palani(CSIR); Smitha Gopinath(CSIR); Nagesh R. Iyer(CSIR)"
] |
Fracture analysis and remaining life prediction has been carried out for aluminium alloy (Al2014A) plate panels with concentric stiffener by varying sizes and positions under fatigue loading. Tensioncoupon tests and compact tension tests on 2014A have been carried out to evaluate mechanical propertiesand crack growth constants. Domain integral technique has been used to compute the Stress intensity factor(SIF) for various cases. Generalized empirical expressions for SIF have been derived for various positions ofstiffener and size. From the study, it can be concluded that the remaining life for stiffened panel for particularsize and position can be estimated by knowing the remaining life of corresponding unstiffened panel.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001960368
|
oai_dc
|
Material distribution optimization of 2D heterogeneous cylinder under thermo-mechanical loading
|
Material distribution optimization of 2D heterogeneous cylinder under thermo-mechanical loading
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Masoud Asgari(K. N. Toosi University of Technology)"
] |
In this paper optimization of volume fraction distribution in a thick hollow cylinder with finite length made of two-dimensional functionally graded material (2D-FGM) and subjected to steady statethermal and mechanical loadings is considered. The finite element method with graded material properties within each element (graded finite elements) is used to model the structure. Volume fractions of constituent materials on a finite number of design points are taken as design variables and the volume fractions at any arbitrary point in the cylinder are obtained via cubic spline interpolation functions. The objective function selected as having the normalized effective stress equal to one at all points that leads to a uniform stress distribution in the structure. Genetic Algorithm jointed with interior penalty-function method for implementing constraints is effectively employed to find the global solution of the optimization problem.
Obtained results indicates that by using the uniform distribution of normalized effective stress as objective function, considerably more efficient usage of materials can be achieved compared with the power law volume fraction distribution. Also considering uniform distribution of safety factor as design criteria instead of minimizing peak effective stress affects remarkably the optimum volume fractions.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001960370
|
oai_dc
|
Nonlinear numerical simulation of RC columns subjected to cyclic oriented lateral force and axial loading
|
Nonlinear numerical simulation of RC columns subjected to cyclic oriented lateral force and axial loading
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Kabir Sadeghi(Girne American University)"
] |
A nonlinear Finite Element (FE) algorithm is proposed to analyze the Reinforced Concrete (RC) columns subjected to Cyclic Loading (CL), Cyclic Oriented Lateral Force and Axial Loading (COLFAL), Monotonic Loading (ML) or Oriented Pushover Force and Axial Loading (OPFAL) in any direction. In the proposed algorithm, the following parameters are considered: uniaxial behavior of concrete and steel elements, the pseudo-plastic hinge produced in the critical sections, and global behavior of RC columns. In the proposed numerical simulation, the column is discretized into two Macro-Elements (ME) located between the pseudo-plastic hinges at critical sections and the inflection point. The critical sections are discretized into Fixed Rectangular Finite Elements (FRFE) in general cases of CL, COLFAL or ML and are discretized into Variable Oblique Finite Elements (VOFE) in the particular cases of ML or OPFAL. For pushover particular case, a fairly fast converging and properly accurate nonlinear simulation method is proposed to assess the behavior of RC columns. The proposed algorithm has been validated by the results of tests carried out on full-scale RC columns.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001960381
|
oai_dc
|
A teaching learning based optimization for truss structures with frequency constraints
|
A teaching learning based optimization for truss structures with frequency constraints
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Tayfun Dede(Karadeniz Technical University); Vedat Toğan(Karadeniz Technical University)"
] |
Natural frequencies of the structural systems should be far away from the excitation frequency in order to avoid or reduce the destructive effects of dynamic loads on structures. To accomplish this goal, a structural optimization on size and shape has been performed considering frequency constraints. Such anoptimization problem has highly nonlinear property. Thus, the quality of the solution is not independent of the optimization technique to be applied. This study presents the performance evaluation of the recently proposed meta-heuristic algorithm called Teaching Learning Based Optimization (TLBO) as an optimization engine in the weight optimization of the truss structures under frequency constraints. Some examples regarding the optimization of trusses on shape and size with frequency constraints are solved. Also, the results obtained are tabulated for comparison. The results demonstrated that the performance of the TLBO is satisfactory. Additionally, TLBO is better than other methods in some cases.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001960362
|
oai_dc
|
Analysis of higher order composite beams by exact and finite element methods
|
Analysis of higher order composite beams by exact and finite element methods
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Guang-hui He(Shanghai University); Xiao Yang(Shanghai University)"
] |
In this paper, a two-layer partial interaction composite beams model considering the higher order shear deformation of sub-elements is built. Then, the governing differential equations and boundary conditions for static analysis of linear elastic higher order composite beams are formulated by means of principle of minimum potential energy. Subsequently, analytical solutions for cantilever composite beams subjected to uniform load are presented by Laplace transform technique. As a comparison, FEM for this problem is also developed, and the results of the proposed FE program are in good agreement with the analytical ones which demonstrates the reliability of the presented exact and finite element methods. Finally, parametric studies are performed to investigate the influences of parameters including rigidity of shear connectors, ratio of shear modulus and slenderness ratio, on deflections of cantilever composite beams, internal forces and stresses. It is revealed that the interfacial slip has a major effect on the deflection, the distribution of internal forces and the stresses.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001960369
|
oai_dc
|
A new damage detection indicator for beams based on mode shape data
|
A new damage detection indicator for beams based on mode shape data
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"O. Yazdanpanah(Shomal University); S.M. Seyedpoor(Shomal University); H. Akbarzadeh Bengar(University of Mazandaran)"
] |
In this paper, a new damage indicator based on mode shape data is introduced to identify damage in beam structures. In order to construct the indicator proposed, the mode shape, mode shape slope and mode shape curvature of a beam before and after damage are utilized. Mode shape data of the beam are first obtained here using a finite element modeling and then the slope and curvature of mode shape are evaluated via the central finite difference method. In order to assess the robustness of the proposed indicator, two test examples including a simply supported beam and a two-span beam are considered. Numerical results demonstrate that using the proposed indicator, the location of single and multiple damage cases having different characteristics can be accurately determined. Moreover, the indicator shows a better performance when compared with a well-known indicator found in the literature.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001960372
|
oai_dc
|
Effects of edge crack on the vibration characteristics of delaminated beams
|
Effects of edge crack on the vibration characteristics of delaminated beams
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Yang Liu(Nanyang Technological University); Dong W. Shu(Nanyang Technological University)"
] |
Delaminations and cracks are common failures in structures. They may significantly reduce thestiffness of the structure and affect their vibration characteristics. In the present study, an analytical solution is developed to study the effect of an edge crack on the vibration characteristics of delaminated beams. The rotational spring model, the „free mode‟ and „constrained mode‟ assumptions in delamination vibration areadopted. This is the first study on how an edge crack affects the vibration characteristic of delaminated beams and new nondimensional parameters are developed accordingly. The crack may occur inside or outside the delaminated area and both cases are studied. Results show that the effect of delamination length and thickness-wise location on reducing the natural frequencies is aggravated by an increasing crack depth. The location of the crack also influences the effect of delamination, but such influence is different between crack occurring inside and outside the delaminated area. The difference of natural frequencies between „free mode‟ and „constrained mode‟ increases then decreases as the crack moves from one side of the delaminated region to the other side, peaking at the middle. The analytical results of this study can serve as the benchmark for FEM and other numerical solutions.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001960374
|
oai_dc
|
Bending analysis of a single leaf flexure using higher-order beam theory
|
Bending analysis of a single leaf flexure using higher-order beam theory
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Nghia Huu Nguyen(영납대학교); 이동연(영남대학교)"
] |
We apply higher-order beam theory to analyze the deflections and stresses of a cantileveredsingle leaf flexure in bending. Our equations include shear deformation and the warping effect in bending.
The results are compared with Euler-Bernoulli and Timoshenko beam theory, and are verified by finiteelement analysis (FEA). The results show that the higher-order beam theory is in a good agreement with theFEA results, with errors of less than 10%. These results indicate that the analysis of the deflections andstresses of a single leaf flexure should consider the shear and warping effects in bending to ensure highprecision mechanism design.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001960379
|
oai_dc
|
A polynomial chaos method to the analysis of the dynamic behavior of spur gear system
|
A polynomial chaos method to the analysis of the dynamic behavior of spur gear system
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"A. Guerine(University Road); A. El Hami(National School of Engineers of Sfax); T. Fakhfakh(National School of Engineers of Sfax); M. Haddar(National School of Engineers of Sfax)"
] |
In this paper, we propose a new method for taking into account uncertainties based on the projection on polynomial chaos. The new approach is used to determine the dynamic response of a spur gear system with uncertainty associated to gear system parameters and this uncertainty must be considered in the analysis of the dynamic behavior of this system. The simulation results are obtained by the polynomial chaos approach for dynamic analysis under uncertainty. The proposed method is an efficient probabilistic tool for uncertainty propagation. It was found to be an interesting alternative to the parametric studies. The polynomial chaos results are compared with Monte Carlo simulations.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001921295
|
oai_dc
|
Analytical model for the composite effect of coupled beams with discrete shear connectors
|
Analytical model for the composite effect of coupled beams with discrete shear connectors
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Tianxin Zheng(University of Nottingham Ningbo); Yong Lu(The University of Edinburgh); Asif Usmani(The University of Edinburgh)"
] |
Two-layer coupled or composite beams with discrete shear connectors of finite dimensions are commonly encountered in pre-fabricated construction. This paper presents the development of simplified closed-form solutions for such type of coupled beams for practical applications. A new coupled beam element is proposed to represent the unconnected segments in the beam. General solutions are then developed by an inductive method based on the results from the finite element analysis. A modification issubsequently considered to account for the effect of local deformations. For typical cases where the local deformation is primarily concerned about its distribution over the depth of the coupled beam, empirical modification factors are developed based on parametric calculations using finite element models. The developed analytical method for the coupled beams in question is simple, sufficiently accurate, and suitable for quick calculation in engineering practice.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001921289
|
oai_dc
|
FE model updating method incorporating damping matrices for structural dynamic modifications
|
FE model updating method incorporating damping matrices for structural dynamic modifications
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Vikas Arora(University of Southern Denmark)"
] |
An accurate finite element (FE) model of a structure is essential for predicting reliably its dynamic characteristics. Such a model is used to predict the effects of structural modifications for dynamic design of the structure. These modifications may be imposed by design alterations for operating reasons. Most of the model updating techniques neglect damping and so these updated models can’t be used for accurate prediction of vibration amplitudes. This paper deals with the basic formulation of damped finite element model updating method and its use for structural dynamic modifications. In this damped damped finite element model updating method, damping matrices are updated along with mass and stiffness matrices. The damping matrices are updated by updating the damping coefficients. A case involving actual measured data for the case of F-shaped test structure, which resembles the skeleton of a drilling machine is used to evaluate the effectiveness of damped FE model updating method for accurate prediction of the vibration levels and thus its use for structural dynamic modifications. It can be concluded from the study that damped updated FE model updating can be used for structural dynamic modifications with confidence.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001921287
|
oai_dc
|
A curved shell finite element for the geometrically non-linear analysis of box-girder beams curved in plan
|
A curved shell finite element for the geometrically non-linear analysis of box-girder beams curved in plan
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Ü lkü H. Çalık-Karaköse(Istanbul Technical University); Engin Orakdöğen(Istanbul Technical University); Ahmet I. Saygun(Istanbul Technical University); Harm Askes(University of Sheffield)"
] |
A four-noded curved shell finite element for the geometrically non-linear analysis of beams curved in plan is introduced. The structure is conceived as a sequence of macro-elements (ME) having the form of transversal segments of identical topology where each slice is formed using a number of the curved shell elements which have 7 degrees of freedom (DOF) per node. A curved box-girder beam example is modelled using various meshes and linear analysis results are compared to the solutions of a well-known computer program SAP2000. Linear and non-linear analyses of the beam under increasing uniformly distributed loads are also carried out. In addition to box-girder beams, the proposed element can also be usedin modelling open-section beams with curved or straight axes and circular plates under radial compression. Buckling loads of a circular plate example are obtained for coarse and successively refined meshes andresults are compared with each other. The advantage of this element is that curved systems can be realistically modelled and satisfactory results can be obtained even by using coarse meshes.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001921291
|
oai_dc
|
Design of MR dampers to prevent progressive collapse of moment frames
|
Design of MR dampers to prevent progressive collapse of moment frames
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"김진구(성균관대학교); 이승준(Samsung Engineering and Construction); 민경원(단국대학교)"
] |
In this paper the progressive collapse resisting capacity of steel moment frames with MR dampers is evaluated, and a preliminary design procedure for the dampers to prevent progressive collapse is suggested. Parametric studies are carried out using a beam-column subassemblage with varying natural period, yield strength, and damper force. Then the progressive collapse potentials of 15-story steel moment frames installed with MR dampers are evaluated by nonlinear dynamic analysis. The analysis results of the model structures showed that the MR dampers are effective in preventing progressive collapse of framed structures subjected to sudden loss of a first story column. The effectiveness is more noticeable in the structure with larger vertical deflection subjected to larger inelastic deformation. The maximum responses of the structure installed with the MR dampers designed to meet a given target dynamic response factor generally coincided well with the target value on the conservative side.
|
토목공학
| null |
kci_detailed_000066.xml
|
|||
ART001921292
|
oai_dc
|
Damage assessment from curvature mode shape using unified particle swarm optimization
|
Damage assessment from curvature mode shape using unified particle swarm optimization
|
{
"journal_name": "국제구조공학회",
"publisher": null,
"pub_year": null,
"pub_month": null,
"volume": null,
"issue": null
}
|
[
"Bharadwaj Nanda(Indian Institute of Technology); Damodar Maity(Indian Institute of Technology); Dipak Kumar Maiti(Indian Institute of Technology)"
] |
A two-step procedure to detect and quantify damages in structures from changes in curvature mode shapes is presented here. In the first step the maximum difference in curvature mode shapes of the undamaged and damaged structure are used for visual identification of the damaged internal-substructure. In the next step, the identified substructures are searched using unified particle swarm optimization technique for exact identification of damage location and amount. Efficiency of the developed procedure is demonstrated using beam like structures. This methodology may be extended for identifying damages in general frame structures.
|
토목공학
| null |
kci_detailed_000066.xml
|
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