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Pushover analysis procedure for systems considering SSI effects based on capacity spectrum method

Earthquake Engineering and Engineering Vibration 2007年第3期6卷 269-279页

作者：王凤霞欧进萍 School of Civil Engineering Harbin Inst of Technology Harbin 150090 China Heilongjiang Science and Technology Institute Harbin 150090 China School of Civil Engineering Harbin Inst of Technology Harbin 150090 China Dalian University of Technology Dalian 116024 China

This paper presents a new procedure to transform an SSI system into an equivalent SDOF system using twice equivalence. A pushover analysis procedure based on the capacity spectrum method for buildings with SSI effects （PASSI） is then established based on the equivalent SDOF system, and the modified response spectrum and equivalent capacity spectrum are obtained. Furthermore, the approximate formulas to obtain the dynamic stiffness of foundations are suggested. Three steel buildings with different story heights （3, 9 and 20） including SSI effects are analyzed under two far-field and two near-field historical records and an artificial seismic time history using the two PASSI procedures and the nonlinear response history analysis （NLhRHA） method. The results are compared and discussed. Finally, combined with seismic design response spectrum, the nonlinear seismic response of a 9-story building with SSI effects is analyzed using the PASSI procedures, and its seismic performance is evaluated according to the Chinese ＇Code for Seismic Design of Buildings. The feasibility of the proposed procedure is verified.

关键词： pushover analysis procedure soil-structural interaction (SSI) capacity spectrum method equivalent SDOF system nonlinear response history analysis

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Investigation of Effects of capacity spectrum method on Performance Evaluation of Multi-Story Buildings According to the IRAQI Seismic Code Requirements

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Open Journal of Civil Engineering 2016年第3期6卷 420-441页

作者： Al-Nuaimi Amer Mohamed Sobaih Akl Adel Department of Civil Engineering University of Baghdad Baghdad Egypt Department of Structural Engineering Cairo University Cairo Egypt

The aim of this study is to assess the performance objectives defined in the Iraqi Seismic Code (ISC) in order to make a realistic evaluation related to Performance-Based Seismic Design (PBSD) of multi-story reinforced concrete buildings and also to compare and evaluate structural response demands obtained from nonlinear static analysis procedures according to two versions of the capacity spectrum method (CSM) which are recommended in ATC 40 and ATC 55. Two groups of three-dimensional RC buildings with different heights, designed according to Iraqi Building Code Requirements for Reinforced Concrete (IBC), are investigated. Pushover analyses are carried out to determine the nonlinear behavior of the buildings under three different seismic hazard levels, for two Iraqi seismic zones, of earthquake loads. In order to determine performance levels of the buildings, maximum inter-story drift demands and plasticizing sequence are determined and compared with the related limits using the CSM recommended in ATC 40 and ATC 55. From the results of this research, it can be concluded that RC buildings designed according to the Iraqi codes sufficiently provide the performance objectives stipulated in the ISC. Comparing structural response quantities obtained from the two versions of CSM, effects on performance evaluations of the buildings are investigated comparatively, as well.

关键词： Pushover Analysis capacity spectrum method Seismic capacity Iraq PBSD RC Buildings

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Bound analysis of target displacement for seismic performance assessment of buildings

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Journal of Harbin Institute of Technology(New Series) 2008年第1期15卷 27-32页

作者：贾立哲段忠东陆钦年 chool of Civil Engineering Harbin Institute of Technology

The earthquake demand spectrum is often assumed as the average spectrum in the seismic design code or based upon probabilistic models to take into account the uncertainties of ground motion. The average spectrum can not deal with the uncertainty of earthquake excitation. Furthermore, results of probabilistic analysis are suspicious when information describing the uncertainty is inadequate. Considering the uncertainties of peak acceleration of ground motion and characteristic period of response spectra using a double bounded convex set model, the bounds of the design spectrum and the demand spectrum were obtained based on Chinese seismic code. Then the convex analysis method was integrated into the capacity spectrum procedure to study the bound characteristics of target displacement. Finally, the target displacement was derived with an interval, and it is more objective and robust with respect to probabilistic perspective.

关键词： convex set model capacity spectrum method uncertainty

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Simplified stiffness-based approach for seismic performance evaluation of moment-resisting frame

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Journal of Southeast University(English Edition) 2009年第2期25卷 241-246页

作者：于琦孟少平吴京孙巍巍东南大学混凝土与预应力混凝土结构教育部重点实验室南京210096 南京理工大学土木工程系南京210094

Based on the concept of stiffness degradation, a damage index of the whole frame and the storey is proposed for the frame seismic performance evaluation. The index is compatible with the non-linear static analysis （e. g. the pushover analysis）, and the structural damage is considered via plastic hinges. Simultaneously, a practical approach is developed to obtain the relationships between the proposed index and earthquake intensities based on the capacity spectrum method. The proposed index is then illustrated through two low-rise reinforced concrete frames, and it is also compared with some other indices. The results indicate that the proposed index is on the safe side and not sensitive to the lateral load pattern. The storey index is helpful to reflect the storey damage and to uncover the position of the weak storey. Finally, the relationship between performance levels and damage index values is also proposed through statistical analysis for the performance-based seismic evaluation.

关键词： damage index seismic evaluation capacity spectrum method frame lateral load pattern pushover analysis performance level stiffness degradation

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