土—框架结构水平动力相互作用的频域分析  

Frequency-domain analysis for interaction of horizontal dynamic in soil-frame structure

作　　者：祝文畏[1] 杨学林[1] 申屠剑君[1] 岳燕玲[1] 

机构地区：[1]浙江省建筑设计研究院,杭州310006

出　　处：《建筑结构》2012年第8期133-136,共4页Building Structure

摘　　要：考虑框架结构层间分布质量,在层局部坐标系中建立运动微分方程。建立频域内的层间场传递矩阵,利用楼层集中质量动力平衡建立频域内的层间点传递矩阵。引入基础动力刚度并利用基础动力平衡,结合傅氏变换,得到结构地震反应与水平地震输入之间的关系,并给出相关求解方法。分析考虑层间分布质量的影响,显示框架结构高阶振型在地震反应中参与程度提高;结构阻尼和辐射阻尼对结构反应重要性的影响随着上部结构刚度的变化而改变。Considering the distributed mass along the frame stories of frame structure, equation of motion is given in the local coordinates of the story. The field transfer matrix is founded in the frequency domain, and the point transfer matrix is founded by using the dynamic equilibrium of the lumped mass at the floor. The dynamic stiffness of base is introduced and the dynamic equilibrium of base is used. Structural response under horizontal earthquake can be obtained through the fast Fourier transform technique. The analysis results show that the high modes play more important effects to the seismic response of structure. And the effects on structure are different with the vary of structure stiffness between radiation damping and structure damping.

关 键 词：框架结构 水平地震反应 频域分析 传递矩阵 辐射阻尼 结构阻尼 

分 类 号：TU311.3[建筑科学—结构工程]