多点激励反应谱法的理论研究

基于虚拟激励原理建立了多点激励反应谱法。该方法所表示的结构地震动反应由三部分组成,即拟静力响应、动力响应及二者的耦合响应,其中拟静力响应是由地面各点输入位移不一致引起的;动力响应主要是由结构在地面加速度作用下引起的;当结构自振周期小于2s时,拟静力响应与动力响应之间的耦合项可以忽略。该方法计算公式形式简洁,物理意义明确,且与我国现行《抗震规范》中的一致激励反应谱建立了定量关系。在推导过程中,未做任何特殊简化,因而该方法在理论上是严密的。

Respense Spectrum Method for Multi-Support Seismic Excitations

Based on the pseudo-excitation algorithm,a response spectrum method for multi-support seismic excitations is presented,where,the structural response consist of three components,ie.,the pseudo static response by inconsistent ground displacement,the structural dynamic response by ground motion acceleration and the coupling of pseudo-static and dynamic response.The formulation of response spectrum shows explicit mechanical properties of structure,and itself is rather brief.The quantitative connection is established to the response spectrum method for simple support excitations,which is applied to Chinese aseismatic code.No extra simplifications are drawn in,so the suggested method is theoretically.