某多塔连体高层建筑的竖向地震反应分析

Analysis on Vertical Seismic Response of a Connected Multi-tower Building

针对设有长33.6m的连体和长16.8m悬臂的某多塔连体高层结构,采用ETABS软件对其竖向振动特性和竖向地震反应进行了分析。结果表明,该工程前三阶竖向振型的周期与场地卓越周期接近;前19阶竖向振型均位于反应谱平台段;竖向振动与水平振动存在耦合,意味着结构在水平地震作用下会产生竖向动力效应;在7度多遇竖向地震作用下,连体部分和悬臂部分的结构内力响应较显著而竖向位移响应均较小。

The vertical dynamic characteristic and vertical seismic response of a building with a 16.8-meter-long cantalever and a 33.6-meter-long connecting is analyzed. It turns out that the first three vertical normal periods are close to the characteristic period of the site;the first 19 vertical modes are all located in the plateau of the response spectrum; there is interaction between vertical and horizontal vibrations, which means the structure would produce vertical dynamic response under horizontal earthquakes ; under frequent earthquakes of seismic intensity 7, the structural internal forces in the connecting and cantalever parts are significant, while the vertical displacements are rather small.