（同济大学建工系，上海200092）
［提要］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。
［关键词］多塔连体；竖向地震反应；振动特性
Analysis on Vertical Seismic Response of a Connected Multi tower Building/ShiWenlong,Sun Feifei,Li Guoqiang(Dept. Civil Engineering, Tongji Univ., Shanghai 200092,China)
Abstract: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.
Keywords:connected multitowers; vertical seismic response; dynamic charactiristic