Influence of post-yielding stiffness to seismic response of building structures
Influence of post-yielding stiffness to seismic response of building structures
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发表时间：
2009
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通讯作者：
Ye Lie-ping
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作者：
Ye Lie-ping
准确预测结构弹塑性反应是建立基于性能的建筑结构抗震设计方法的必要条件。在对单自由度和多自由度体系进行大量弹塑性时程分析的基础上，研究了屈服后刚度对结构弹塑性响应离散度的影响。分析结果表明：对于中等或较长振动周期的SDOF体系，屈服后结构刚度越大，最大弹塑性位移和相应的弥散量变化不明显；相反，对于短振动周期的单自由度体系，屈服后刚度越大，最大弹塑性位移和相应的弥散量就会明显减小。而对于屈服后静力较大的多自由度体系，延性系数和耗能分布趋于均匀，最大弹塑性层间位移的离散性明显减小。文中还讨论了提高结构屈服后刚度的措施，并列举了三个典型实例，说明了从结构系统层面考虑建立硬化型结构的方法。
The accurate prediction of elasto-plastic structural response is necessary for establishing the performance based seismic design method of building structures.The influence of post-yield stiffness of structures on the dispersion of elasto-plastic structural response is studied based on a large number of elasto-plastic time-history analysis of single-degree-of-freedom(SDOF) and multi-degree-of-freedom(MDOF) systems.The analytical results show that: for SDOF systems with moderate or long vibration periods,the maximal elasto-plastic displacements and the corresponding dispersions will not obviously change with larger post-yield structural stiffness.On the contrary,the maximal elasto-plastic displacements and the corresponding dispersions will obviously be reduced by larger post-yield stiffness for SDOF systems with short vibration periods.And for MDOF systems with larger post-yield stillness,the ductility factors and energy dissipations tend to be evenly distributed,together with obvious smaller dispersions of maximal elasto-plastic inter-story drift.The paper also discusses measures to increase the structural post-yield stiffness and three typical examples are presented to illustrate the methods of building up a hardening-type structure from the structural systematic level consideration.