（广州容柏生建筑结构设计事务所， 广州  510170）

［摘要］中冶口岸大厦为超高层连体结构，高低塔通过4层底部桁架支承刚性连体相连，两栋塔楼体量差别较大，主轴方向不一致，连体需要传递轴力、弯矩、剪力。采用简化模型分析不同主轴方向连体的受力规律，得出连体的顶层和底层需要传力较大；实际工程设计时，对于结构4项不规则项，提出合理的抗震性能目标，采用弹性分析及动力弹塑性时程分析相结合的方式；同时对连体进行了多种楼板假定的分析和设计，结果表明：连体方案设计合理，设计加强措施有效，结构各项指标能满足规范和性能目标的要求；采用整体吊装的施工方案可节约工期。

［关键词］刚性连体； 大跨连体结构； 性能设计； 结构吊装

中图分类号：TU398-7文献标识码：A文章编号：1002-848X(2020)04-0106-06

Analysis of mechanical characteristics and difficulties of a super high-rise complex connected structure

Xu Lin， Peng Linhai， Yi Yufeng， Zhang Wenhua， Li Shengyong， Zhou Ding， Chang Lei

(RBS Architectural Engineering Design Associates, Guangzhou 510170, China)

Abstract:MCC port building is a super high-rise connected structure. The high and low towers are connected by rigid connection supported by 4-story high bottom trusses. The volumes of the two towers are quite different, and the main axis directions are not the same. The connection needs to transfer axial force, bending moment and shear force. The simplified model was used to analyze the mechanical law of the connected body in different principal directions, and it was concluded that the top and bottom layers of the connected body needed to transmit more forces. In the actual engineering design, the reasonable seismic performance objectives were proposed for four irregular items of the structure, and the combination of elastic analysis and dynamic elastic-plastic time-history analysis was adopted. At the same time, the connected body was analyzed and designed based on a variety of floor assumptions. The results show that the design of the connected scheme is reasonable, the design strengthening measures are effective, and the structural indexes can meet the requirements of the specifications and performance objectives. The  overall lifting construction scheme can save the construction period.

Keywords:rigid connected structure; large-span connected structure; performance-based design; structure lifting

作者简介：徐麟，硕士，高级工程师，一级注册结构工程师，Email：xulin@gzrbs.com。