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Effect of the spectral shape of ground motion records on the collapse fragility assessment of degrading SDOF systems

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Earthquake Engineering and Engineering Vibration 2021年第4期20卷 925-941页

作者： Amin Norouzi Mehdi Poursha Department of Civil Engineering Sahand University of TechnologyTabriz 51335-1996Iran Earthquake Engineering Research Center Sahand University of TechnologyTabriz 51335-1996Iran

The main purpose of this paper is to study the collapse capacity of single degree of freedom(SDOF)systems and to produce fragility curves as well as collapse capacity spectra while considering a broad range of structural parameters,including system degradation,the P-Δeffect,ductility capacity and the post-capping stiffness *** modified Ibarra-Krawinkler deterioration model was used to consider hysteretic behavior.A comprehensive study was conducted to extract the collapse capacity spectrum of SDOF systems with a wide range of periods,varying from 0.05 to 4 s,to cover short,intermediate and long *** dynamic analysis(IDA)was performed for SDOF systems to identify the condition in which the collapse capacity of the system is *** IDAs were performed using different sets of seismic ground *** ground motion records were categorized into different sets based on three spectral shape parameters,including the epsilon,saratio and N_(p).The collapse fragility curves of SDOF systems with different periods were extracted to illustrate the collapse capacity at different probability *** results show that structural degradation and ductility as well as the spectral shape parameters significantly affect the collapse capacity of SDOF *** the other hand,the post-capping stiffness ratio and small levels of the P-Δeffect do not remarkably change collapse ***,the collapse capacity of SDOF systems is more sensitive to the records categorized based on saratio and N_(p)than those classified based on epsilon.

关键词： collapse capacity fragility analysis degrading SDOF system IDA curve Epsilon,N_(p) saratio P-Δeffect

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