Constant-ductility strength demand spectra for seismic design of structures

In displacement-based seismic design, constant-ductility strength demand spectra (CDSDS) are very useful for preliminary design of new structures where the global displacement ductility capacity is known. The CDSDS can provide the required inelastic lateral strength of new structures from the required elastic lateral strength. Based on a statistical study of nonlinear time-history for an SDOF system, the mean CDSDS corresponding to four site conditions are presented and approximate expressions of the inelastic spectra are proposed, which are functions of the structural period and ductility level.The effects of site conditions, structural period, level of ductility, damping and post-yield stiffness of structures on CDSDS are also investigated. It is concluded that site conditions, ductility level and structural period have important effects on the CDSDS and damping, post-yield stiffness effects are rather complex and of minor importance. The damping, post-yield stiffness effects depend on both the level of ductility and the natural period of structures.

作 者： Zhai Changhai Xie Lili   作者單位： Zhai Changhai(School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China)

Xie Lili(School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China;Institute of Engineering Mechanics, China Earthquake Administration, Harbin 150080, China) 

刊 名： 地震工程與工程振動（英文版）  SCI 英文刊名： EARTHQUAKE ENGINEERING AND ENGINEERING VIBRATION  年，卷(期)： 2005 4(2)  分類號： P315  關鍵詞： displacement-based seismic design   CDSDS   site conditions   damping   hysteretic model  

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