【摘要】 为准确预测强震下结构弹塑性响应,实现基于性能的抗震设计方法,有必要研究结构屈服后刚度对结构弹塑性地震响应离散程度的影响。根据单自由度体系和多自由度体系的大量的弹塑性时程动力分析,研究了屈服后刚度对结构弹塑性地震响应的影响规律。分析研究结果表明:对于单自由度体系,在中长周期范围,最大弹塑性位移响应及其离散性随屈服后刚度的增大变化不大;在短周期范围,最大弹塑性位移响应及其离散性随屈服后刚度的增大显著减小。对于多自由度体系,随屈服后刚度增大,延性需求和累积滞回耗能分布趋于均匀,最大弹塑性层间位移响应的离散性显著减小。最后讨论了提高结构屈服后刚度的措施,并通过典型算例说明了在结构系统层次上实现强化型结构的方法。更多还原

【Abstract】 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.更多还原