【摘要】 首先对结构进行自由振动分析,求出各阶振型的弹性自振周期及相应的振型值;然后根据各振型的自振周期,由位移反应谱导出单自由度体系的等效位移,接着由等效原理反推出结构各振型的弹性位移,振型组合后得到结构的位移曲线;再由与性能水平相应的结构层间侧移角限值确定结构各振型目标侧移,对其分别进行分析计算,振型组合求得结构层间剪力,实现了考虑高振型影响的高层建筑结构直接基于位移的抗震设计。通过算例介绍了方法的全过程,并由弹塑性时程分析验证了方法的可行性,为高层建筑结构直接基于位移的抗震设计提供了一个可供参考的思路。更多还原

【Abstract】 The natural periods and corresponding modes of structure are obtained by free vibration analysis.Based on the periods,the equivalent displacement of single-degree-of-freedom system for each mode is deduced by displacement response spectra,and the structural lateral elastic displacement of each mode could be determined by "equivalence principle".So the structural lateral elastic displacement can be obtained by SRSS rule.Then,based on the story drift ratio limits,the structural target lateral displacement of each mode could be determined,and the shear in each story is obtained by SRSS rule too,the direct displacement-based seismic design(DDBSD) method of high-rise buildings considering higher mode effects is realized.The paper illustrates the application of the proposed procedure with an example and attempts to prove its feasibility by elasto-plastic time-history analysis.It provides a valuable thought for DDBSD method of high-rise buildings.更多还原