1)广东省建筑设计研究院，广州，510010;2)华南理工大学高层建筑结构研究所，广州，510641;3)广州容柏生建筑工程设计事务所，510170

［提要］为探索位于双塔高层建筑上的连体结构竖向地震作用的特有规律，首先输入多条实际竖向地震记录，用时程分析法考察了塔楼高度和连体跨度不同的多个算例。然后将其抽象成塔楼和连体桁架组成的两个自由度体系，运用频域分析方法，得到竖向地震作用的变化规律。分析表明，随着桁架与塔楼频率比的增加，连体地震作用的放大效应越明显；当连体与塔楼质量比较小且两者频率相近时，连体地震反应进一步加强。现行抗震规范的重力系数法提出的大跨度结构竖向地震的实用计算公式对于文中研究结构并不完全适用。提出了考虑塔楼和桁架协同的地震作用实用算式，并对一个超高层工程实例进行了竖向地震作用分析，与时程分析结果吻合较好。

［关键词］连体结构；高层建筑；竖向地震

Practical Design Method for Large Span Corridor Structure in Twin-tower Tall Building/Hou Jiajian^1,2, Rong Baisheng^1，3, Han Xiaolei², Xie Yiyuan²(1 The Architectural Design and Research Institute of Guangdong Province,Guangzhou 510010,China; 2 South China University of Science and Technology,Guangzhou 510641,China; 3 RBS Architecture Engineer Design Associate,Guangzhou 510170,China)Abstract:The vertical seismic response of space corridor built on twintower tall buildings is investigated. The time history analysis is applied, the inputs are vertical seismic records, and the examples vary with tower height or truss span. Then the structure is simplified as a 2-DOF model and analyzed in frequency domain, and the main principles of vertical seismic response are drawn: with the increasing of truss to tower frequency ratio, the amplification of seismic response is increased; when the truss to tower mass ratio is small and the truss to tower ration is close to 1, the seismic responseof truss is increased further. The gravity load ratio method adopted by current China aseismic design code does not work out with safe result in the researched structure. A seismic response amplified factor formula is suggested. An example of supertall building has been analyzed with the suggested method and the time history method, the results coincide well.

Keywords:twin tower; tall building; space corridor; vertical sei