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Earthquake Engineering and Engineering Vibration 2024年第3期23卷 713-726页

作者： M.A.Najafgholipour S.Heidarian Radbakhsh E.Erfani Department of Civil and Environmental Engineering Shiraz University of TechnologyShiraz ***Iran Department of Building Civiland Environmental EngineeringConcordia UniversityMontréal H3G 1M8Canada

This paper presents an investigation of the seismic behavior of reinforced concrete(RC)structures in which shear walls are the main lateral load-resisting elements and the participation of flat slab floor systems is not considered in the seismic design *** this regard,the behavior of six prototype structures(with different heights and plan layouts)is investigated through nonlinear static and time history analyses,implemented in the OpenSees *** results of the analyses are presented in terms of the behavior of the slab-column connections and their mode of failure at different loading ***,the global response of the buildings is discussed in terms of some parameters,such as lateral overstrength due to the gravity flat slab-column *** to the nonlinear static analyses,in structures in which the slab-column connections were designed only for gravity loads,the slab-column connections exhibited a punching mode of failure even in the early stages of ***,the punching failure was eliminated in structures in which a minimum transverse reinforcement recommended in ACI 318(2019)was provided in the slabs at joint ***,despite neglecting the contribution of gravity flat slab-column frames in the lateral load resistance of the structures,a relatively significant overstrength was imposed on the structures by the gravity frames.

关键词： RC flat slab-column frames seismic behavior nonlinear analysis time history analysis

Structure-dependent difference equations for time integration

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Earthquake Engineering and Engineering Vibration 2012年第4期11卷 485-498页

作者： Shuenn-Yih Chang Department of Civil Engineering Taipei University of Technology (NTUT)

A structure-dependent explicit method with enhanced stability properties is proposed in this study. In general, the method offers unconditional stability for structural systems except those with a particular instantaneous stiffness hardening behavior. In addition, it is second-order accurate and displays no overshooting in high frequency responses. Numerical experiments reveal that the proposed method saves a substantial amount of computational effort in solving inertial problems where only the low frequency responses are of interest, when compared to a general second-order accurate integration method.

关键词： time history analysis structure-dependent difference equation stability accuracy

Seismic response of concrete gravity dam reinforced with FRP sheets on dam surface

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Water Science and Engineering 2013年第4期6卷 409-422页

作者： Hong ZHONG Na-li WANG Gao LIN Faculty of Infrastructure Engineering Dalian University of Technology ACRE Coking and Refractory Engineering Consulting Corporation MCC

This paper aims at exploring the effects of anti-seismic reinforcement with the fiber-reinforced polymer （FRP） material bonded to the dam surface in dam engineering. time-history analysis was performed to simulate the seismic failure process of a gravity dam that was assumed to be reinforced at the locations of slope discontinuity at the downstream surface, part of the upstream face, and the dam heel. A damage model considering the influence of concrete heterogeneity was used to model the nonlinearity of concrete. A bond-slip model was applied to the interface between FRP and concrete, and the reinforcement mechanism was analyzed through the bond stress and the stress in FRP. The results of the crack pattern, displacement, and acceleration of the reinforced dam were compared with those of the original one. It is shown that FRP, as a reinforcement material, postpones the occurrence of cracks and slows the crack propagation, and that cracks emanating from the upstream surface and downstream surface are not connected, meaning that the reinforced dam can retain water-impounding function when subjected to the earthquake. Anti-seismic reinforcement with FRP is therefore beneficial to improving the seismic resistant capability of concrete dams.

关键词： Key words: FRP sheet reinforcement of concrete gravity dam bond behavior seismic damagesimulation time history analysis

Seismic response of skewed RC box-girder bridges

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Earthquake Engineering and Engineering Vibration 2008年第4期7卷 415-426页

作者： Ahmed Abdel-Mohti Gokhan Pekcan Civil and Environmental Engineering Department University of Nevada Reno

It is critical to ensure the functionality of highway bridges after earthquakes to provide access to important facilities. Since the 1971 San Fernando earthquake, there has been a better understanding of the seismic performance of bridges. Nonetheless, there are no detailed guidelines addressing the performance of skewed highway bridges. Several parameters affect the response of skewed highway bridges under both service and seismic loads which makes their behavior complex. Therefore, there is a need for more research to study the effect of skew angle and other related factors on the performance of highway bridges. This paper examines the seismic performance of a three-span continuous concrete box girder bridge with skew angles from 0 to 60 degrees, analytically. Finite element （FE） and simplified beam-stick （BS） models of the bridge were developed using SAP2000. Different types of analysis were considered on both models such as： nonlinear static pushover, and linear and nonlinear time history analyses. A comparison was conducted between FE and BS, different skew angles, abutment support conditions, and time history and pushover analysis. It is shown that the BS model has the capability to capture the coupling due to skew and the significant modes for moderate skew angles. Boundary conditions and pushover load profile are determined to have a major effect on pushover analysis. Pushover analysis may be used to predict the maximum deformation and hinge formation adequately.

关键词： skew bridge seismic response pushover analysis time history analysis modeling

Peak earthquake response of structures under multi-component excitations

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Earthquake Engineering and Engineering Vibration 2007年第4期6卷 357-370页

作者： Jianwei Song Zach Liang Yi-Lun Chu George C. Lee Department of Civil Structural and Environmental Engineering State University of New York at Buffalo USA

Accurate estimation of the peak seismic responses of structures is important in earthquake resistant design. The internal force distributions and the seismic responses of structures are quite complex, since ground motions are multidirectional. One key issue is the uncertainty of the incident angle between the directions of ground motion and the reference axes of the structure. Different assumed seismic incidences can result in different peak values within the scope of design spectrum analysis for a given structure and earthquake ground motion record combination. Using time history analysis to determine the maximum structural responses excited by a given earthquake record requires repetitive calculations to determine the critical incident angle. This paper presents a transformation approach for relatively accurate and rapid determination of the maximum peak responses of a linear structure subjected to three-dimensional excitations within all possible seismic incident angles. The responses can be deformations, internal forces, strains and so on. An irregular building structure model is established using SAP2000 program. Several typical earthquake records and an artificial white noise are applied to the structure model to illustrate the variation of the maximum structural responses for different incident angles. Numerical results show that for many structural parameters, the variation can be greater than 100%. This method can be directly applied to time history analysis of structures using existing computer software to determine the peak responses without carrying out the analyses for all possible incident angles. It can also be used to verify and/or modify aseismic designs by using response spectrum analysis.

关键词： multi-component ground motion time history analysis peak structural response axis rotation

Seismic demand evaluation of medium ductility RC moment frames using nonlinear procedures

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Earthquake Engineering and Engineering Vibration 2013年第3期12卷 399-409页

作者： Hosein Ghaffarzadeh Nima Talebian Roya Kohandel Faculty of Civil Engineering University of TabrizTabriz Iran Faculty of Civil Engineering Universiti Teknologi Malaysia81310 UTM Skudai Johor Malaysia

Performance-based earthquake engineering is a recent focus of research that has resulted in widely developed design methodologies due to its ability to realistically simulate structural response characteristics. Precise prediction of seismic demands is a key component of performance-based design methodologies. This paper presents a seismic demand evaluation of reinforced concrete moment frames with medium ductility. The accuracy of utilizing simplified nonlinear static analysis is assessed by comparison against the results of time history analysis on a number of frames. Displacement profiles, drift demand and maximum plastic rotation were computed to assess seismic demands. Estimated seismic demands were compared to acceptance criteria in FEMA 356. The results indicate that these frames have sufficient capacity to resist interstory drifts that are greater than the limit value.

关键词： seismic demand evaluation pushover analysis time history analysis plastic rotations FEMA 356

Nonlinear earthquake response analysis and energy calculation for seismic slit shear wall structures

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Earthquake Engineering and Engineering Vibration 2002年第2期1卷 227-236页

作者：蒋欢军吕西林 State Key Laboratory for Disaster Reduction in Civil Engineering Tongji UniversityShanghai 200092China

Based on the concept of structural passive control,a new type of slit shear wall,with improved seismic performance when compared to an ordinary solid shear wall,was proposed by the authors in *** idea has been verified by a series of pseudo-static and dynamic *** this paper a macro numerical model is developed for the wall element and the energy dissipation ***,nonlinear time history analysis is carried out for a 10-story slit shear wall model tested on a shaking ***,the seismic input energy and the individual energy dissipated by the components are calculated by a method based on Newmark-β assumptions for this shear wall model,and the advantages of this shear wall are further demonstrated by the calculation results from the viewpoint of ***,according to the seismic damage criterion on the basis of plastic accumulative energy and maximum response,the optimal analysis is carried out to select design parameters for the energy dissipation device.

关键词： shear wall energy dissipation time history analysis optimal analysis seismic damage criterion

Study of beat phenomenon on a pile-supported pipeline system subjected to wave loading

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High Technology Letters 2007年第1期13卷 48-52页

作者：孟珣 Huang Weiping Li Huajun College of Engineering Ocean University of China Qingdao 266100 P.R.China

Classical beat phenomenon has been observed in most combined systems. The focus of this paper is to provide a better understanding of this phenomenon in an offshore pile-supported pipeline system. The beat phenomeon is caused by the coupling movement of the pipeline and its vertical pile support under certain conditions. It can induce excessive vibration and cause fatigue failure at pipe elbow. However, in some circumstances it does not exist. Numerical results in both frequency and time domains are presented to elucidate this phenomenon in a combined pipeline system. The conclusions of this paper could give constructive guidance to future design of simply supported pipeline systems.

关键词： pipeline pile-supported pipeline system beat phenomenon pipe elbow wave loading time history analysis

Parametric study on damage control design of SMA dampers in frame-typed steel piers

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Frontiers of Structural and Civil Engineering 2009年第4期3卷 384-394页

作者： Xiaoqun LUO Hanbin GE Tsutomu USAMI Advanced Research Center for Seismic Experiments and Computations Meijo UniversityNagoya 468-8502Japan Department of Building Engineering Tongji UniversityShanghai 200092China Department of Civil Engineering Meijo UniversityNagoya 468-8502Japan

This paper focuses on damage control design of SMA dampers in steel frame piers.A parametric study based on time history analyses is carried out on frametyped bridge piers with axial-type SMA damping *** parameters examined are design parameters of strength ratioαF and stiffness ratioα*** performance indexes on displacement and strain are investigated under three JRA recommended Level 2 Ground TypeПstrong earthquake *** recommendations are suggested following the results of the parametric study.

关键词： damage control design shape memory alloy parameter study displacement-based verification strainbased verification time history analysis

Improved Capacity Spectrum Method Using Structural Inelastic Response

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Journal of Southwest Jiaotong University(English Edition) 2006年第3期14卷 252-257页

作者：杨成赵人达 School of Civil Engineering Southwest Jiaotong University Chengdu 610031 China

Existing problems of capacity-demand diagram were considered, and the conversion method between the results of the capacitydemand curves method and dynamic time-history analysis is presented. The factors causing the relative error between the different capacity curves, such as the distribution type for lateral load, assumptions of member bar model , surface irregularity of the structures and P-A effects, were analyzed to build the statistical correlation between the maximum base shear and the top displacements of the components under the different pushover analysis. ATC-40 （Procedure-B） method is verified to be more accurate in calculating the roof displacements of buildings. Meanwhile, the improved method is refined in three aspects and proved effective by a real concrete-freme building.

关键词： time history analysis Capacity-Demand diagram Inelastic model