【摘要】 结构延性折减系数是抗震设计中把弹性抗震强度需求折减到弹塑性设计水准的关键参数。本文通过单自由度体系的非线性时程分析,定性研究了土-结构相互作用对抗震延性折减系数的影响。分析结果表明,土-结构的相互作用对结构抗震延性折减系数有很大的影响,无量纲频率系数和结构高宽比越大影响越显著,考虑土-结构相互作用的结构体系比假定基础固接的结构体系的延性需求大。更多还原

【Abstract】 Structure ductility reduction factor is a key parameter to reduce elastic seismic strength demand to arrive at the design level in building seismic design.Based on the nonlinear time-history analysis of single-degree-of-freedom systems subjected to earthquake ground motions,the effect of soil-structure interaction on the ductility reduction factor is qualitatively investigated in this paper.The results show that the effect of soil-structure interaction is distinct.Commonly the effect increases with the increasing the non-dimensional frequency factor and aspect ratio of the system.The soil-structure system needs much higher ductility demand comparing with the assumed fixed-based system.更多还原