【摘要】 强震下结构会进入弹塑性,现行规范给出的层剪力分布无法反映结构非弹性状态下的响应。基于性态的抗震设计方法需要预知结构弹塑性状态下的层剪力分布。介绍了现有的层剪力分布模式;给出了6个V形偏心支撑钢框架(VEBF)算例的基本信息及所选近场地震动记录;对6个算例结构进行了近场罕遇地震下的弹塑性时程分析,得到了各结构的层剪力分布;提出了近场罕遇地震下VEBF结构弹塑性层剪力分布模式;与时程分析结果对比表明所提出的模式有较好的精度,可为基于性态的抗震设计方法提供参考。更多还原

【Abstract】 Structures will get into plastic state under strong earthquakes.However,the story shear distribution given by current seismic code is derived from elastic analysis and cannot reflect the inelastic behavior of structures.Firstly,the importance of story shear distribution under inelastic state in the performance-based seismic design is emphasized.Then the story shear distributions proposed previously are briefly described and information of six V-shaped eccentrically braced steel frames(VEBF)and the near-fault ground motions records with velocity pulse are introduced.Using nonlinear time-history analyses,the story shear distribution of six VEBFs under near-fault severe earthquakes are obtained.Based on the calculated results from nonlinear time-history analyses,a new story shear distribution pattern is proposed.The comparison between the proposed pattern and the nonlinear dynamic analysis results shows the proposed distribution pattern has reasonable accuracy which may provide some suggestions for the performance-based seismic design.更多还原