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《Earthquake Resistant Engineering and Retrofitting》 2008-03
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Comparison of Strength Demand Spectrum and Ductility Demand Spectrum

Zhang Hai-yan~1,Yi Wei-Jian~2(1.Department of Civil Engineering of South China University of Technology,Guangzhou 510640,China;2.College of Civil Engineering of Hunan University,Changsha 410082,China)  
Strength demand spectrum and ductility demand spectrum are two kinds of elastic-plastic response spectrum.Their difference in concept,computation and application is presented in this paper.Ductility demands of single-degreeof-freedom system under an earthquake wave don't always increase as strength reduction factors increase.The reason of this phenomenon is analyzed.Also it is indicated that to develop the strength demand spectrum,the minimum strength reduction factor must be chosen for an appointed ductility demand factor.But this will bring that for the same strength reduction factor,the ductility demand from the average strength demand spectrum is less than that from the average ductility demand spectrum under many earthquake waves.Therefore,it is proposed that the strength demand spectrum should be substituted by the ductility demand spectrum in the improved capacity spectrum method to estimate the seismic performance of a structure.
【Fund】: 国家自然科学基金资助项目(50678064)
【CateGory Index】: P315.9
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