（中南林业科技大学土木工程与力学学院， 长沙 410000）

[摘要]大底盘多塔楼结构属于复杂高层结构，它的体型庞大复杂，平面不规则，刚度分布不均匀，并伴随着复杂的扭转，其设计及抗震研究难度较大。主要对大底盘双塔对称结构水平地震作用及反应进行分析，采用MADIS/Gen软件建模分析，对比分析了双塔结构整体模型与单塔结构模型的地震作用与地震反应差别，包括楼层剪力、楼层位移、层间位移角和楼层倾覆弯矩。研究结果表明，整体分析模型与单塔分析模型比较，后者楼层剪力偏小，楼层位移接近，层间位移角偏小，倾覆力矩偏大。对多塔结构，宜按整体模型和单塔模型分别计算，并采用较不利的结果进行结构设计。

[关键词]双塔结构； 水平地震反应； 整体模型分析； 单塔模型分析

中图分类号： TU352 文献标识码： A文章编号：  1002-848X(2016)S2-0278-04

Analysis of seismic response of large chassis two-tower structures

Zhu Yao， Chen Bowang

(Central South University of Forestry and Technology， Changsha 410000， China)

Abstract： Large multi-tower chassis structure is complex high-rise structure with a large and complex size, irregular plane, uneven distribution stiffness, along with a complex twist, the design and seismic research is difficult. It focuses on the horizontal seismic action of symmetrical twin towers. MADIS/Gen was used to model and analyze the structure, the main research is the influence of the horizontal earthquake effect on structure. The seismic force and displacement are compared of twin towers symmetrical structure and a single tower structure, including the floor shear, floor displacements, interlayer displacement angle and the floor overturning moment. The results show that, compared the twin towers with the single tower model, the latter′s floor shear and interlayer displacement angle is smaller than the former′s, and both floor displacements is close, and the latter′s floor overturning moment is larger than the former. As a result, the multi tower structure should be respectively calculated according to the overall model and single tower model, and chose the more unfavorable results for structural design.

Keywords： two-tower structure; horizontal earthquake response; overall analysis; single tower model analysis