考虑高阶振型影响的能力谱法的分析研究

结合我国抗震设计规范,形成了简化实用的考虑高阶振型影响的能力谱法.借助模态Pushover分析将多自由度体系分解为几个非线性单自由度体系,以考虑各阶振型的影响.对能力谱法中根据延性系数确定的弹塑性需求谱作了进一步地研究,并对框架结构进行了抗震性能评估.利用MATLAB编制了弹塑性时程分析程序,同时采用SAP2000对该结构进行了时程分析,验证了所编程序的正确性.与能力谱法的结果比较表明,利用能力谱法分析框架结构体系是可行、有效的.

The study on the capacity spectrum method taking into account high modes

In terms of seismic design code, a simple and practical design procedure of the capacity spectrum method taking into account high modes is put forward to analyze reinforced concrete structures. Thus,the muhi-degree-of-freedom nonlinear system is decomposed into several single-degree-of-freedom systems using modal Pushover analysis,and high modes effect can be considered. Inelastic demand spectra based on ductility factor are studied further in capacity spectrum method. Finally, a reinforced concrete frame is analyzed as case study. The programs of the nonlinear time history analysis are also compiled by MATLAB, and analysis the examples by SAP2000 to verify the correctness of the programmed. The colnparison of the results indicated that this procedure is reasonable and effective.