地震动摆动分量对高层建筑结构的影响  

Influence of Rocking Earthquake Ground Motion on Super High-rise Structures

作　　者：楼梦麟[1] 杨明珏[1] 

机构地区：[1]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《结构工程师》2014年第1期86-92,共7页Structural Engineers

基　　金：科技部国家重点实验室基础研究资助项目(SLDRCE08-B-01)

摘　　要：地震时地面运动是复杂的多维运动,它对结构及其构件的作用是空间的,因此建筑结构在地震动作用下是复杂的空间振动。地震动对结构的动力作用不仅产生三个平动分量的作用,也产生三个转动分量的作用。目前超限高层建筑结构的设计已逐渐开始考虑地震动转动分量的影响,但多针对扭转分量,对摆动分量研究较少。以上海中心大厦为典型,建立超高层结构的三维有限元模型。通过基岩地震波输入下的场地地震反应分析获得结构底部地震动输入的水平分量和摆动分量。运用一致输入的方法输入地震动水平分量,运用多点激励的方法输入地震动摆动分量,分别计算地震动水平输入与摆动输入时结构的地震反应,通过比较结构在这两种输入时的地震反应,探讨地震动摆动分量对高层建筑结构的影响。Earthquake ground motion is a complex and multi-dimensional movement, which has a spatial effect on the structure and its components. The structure is under complex spatial vibration under earthquake ground mo- tions. The dynamic action caused by earthquake ground motions on the structures not only produces three transla- tional components, but it also produces three rotational components. The influence of rotational components on seis- mic responses of the super high-rise structures is considered nowadays, but with a focus on torsional component in- stead of rocking component of the three rotational components. In this paper, a three-dimensional finite element model was established to simulate the super high-rise structure of Shanghai Tower. The horizontal and rocking com- ponent of earthquake ground motion at the bottom of the structure were acquired through the site analysis with bed- rock seismic wave input. Seismic responses of the structure under horizontal excitation were calculated with the uni- form excitation method while seismic responses of the structure under rocking excitation were calculated with the- multiple point excitation method. By comparing the seismic responses under different excitation situations, the in- fluence of rocking earthquake ground motion on super high-rise buildings is discussed.

关 键 词：高层建筑结构 多维地震动 多点激励 摆动分量 水平分量 地震动 

分 类 号：TU973.31[建筑科学—结构工程]