【摘要】 目的结合ASPA法和MPA法的优点,提出更适用于工程实际的改进的适应谱Push-over方法(IASPA).方法利用完全解耦的方法对ASPA法进行简化,对两个典型的钢筋混凝土框架结构分别利用IASPA法和MPA法进行Pushover分析,并将分析结果和非线性时程分析的结果进行对比研究.结果对于高阶振型影响较小、结构屈服后振动特性变化不明显的低层结构,IASPA法和MPA法得到的结构峰值响应非常相近.但是对于中高层结构,IASPA法计算得到的峰值响应比MPA法更接近非线性时程分析的结果.结论IASPA法考虑了高阶振型的影响以及结构屈服后振动特性的改变,因此比MPA法具有更高的精度;并且,由于IASPA法忽略了结构屈服后各振型之间的耦合作用,所以较ASPA法计算更加简便,更适用于工程实际.更多还原

【Abstract】 The principal objective of this investigation is to develop an improved adaptive spectra-based pushover analysis procedure(IASPA) based on the advantages of ASPA and MPA procedures.In the paper,ASPA procedure is simplified by using the thought of neglecting the coupling effect of the modes in MPA method.The seismic performances of two reinforced concrete frames determined by IASPA and MPA procedures are compared with nonlinear RHA procedure.The results show that,for low-rise buildings,the peak responses obtained by IASPA and MPA procedures are similar.But for mid or high-rise buildings,the peak responses obtained by IASPA procedure are closer to that of RHA procedure than MPA procedure.It indicates that the IASPA procedure provides more superior accuracy in estimating seismic performance structures compared with MPA procedure because it takes into consideration the contributions of higher modes to response and for the redistribution of inertia forces after structural yielding.And because of its neglecting the coupling of the modes,the IASPA procedure is more convenient for structural engineering practice than ASPA method.更多还原