【摘要】 在基于位移的抗震设计理论中,等延性地震抗力谱对拟建结构的初步设计具有十分重要的作用.利用大量的单自由度体系在不同强震记录作用下的弹塑性动力时程分析结果,从定性到定量详尽研究了阻尼对等延性地震抗力谱的影响规律,得出结论:阻尼对等延性地震抗力谱的影响,不但随场地的不同而不同,而且受延性系数及单质点体系周期的影响较大;要精确考阻尼对等延性地震抗力谱的影响,必须根据其所在的场地条件、结构延性系数及周期确定.最后,根据回归分析结果,给出了阻尼影响等延性地震抗力谱的修正公式,其成果可供抗震研究和设计参考应用.更多还原

【Abstract】 In the displacement-based design,the constantductility seismic resistance spectra are very useful for the preliminary design of new structures where the global displacement ductility capacity is known,which can provide the required inelastic lateral strength of new structures from the required elastic lateral strength.The influences of period of vibration,level of ductility ratio,damping,etc.on constant-ductility seismic resistance spectra are investigated in this paper.And the special emphasis is given to influence analysis of damping on the inelastic spectra.A statistical study is performed of inelastic response computed for different damping ratio SDOF systems with different levels of lateral yielding strength required to maintain the given displacement ductility ratio when subjected to a large number earthquake accelerations.It is concluded that the damping′s effects on constant-ductility seismic resistance spectra are rather complex.It depends on not only site conditions but also the level of ductility ratio and the natural period of structures as well. Finally,results from non-linear regression analysis are presented that provide a simplified expression to be used to approximated quantify the damping influence.Numerical analysis shows the simplified expressions are adequate for the seismic design of structures.更多还原