招商银行上海大厦连桥结构设计

摘要

The link-bridge of China Merchants Bank (CMB)Shanghai building is a complex tall building with a long-span link-bridge between the main towers.The link-bridge is a multi-storey truss in rigid connections with main towers.This paper demonstrates the analysis and design method of CMB Shanghai Building.The state curve of the member for the process of the elastic,cracking,elasto-plastic and bearing-capacity reduction is calculated by the comparison between the elastic-plastic dynamic analysis and shaking table test results.The sequence and the distribution of the plastic hinges and weakness parts of the structural element are concluded. According to the above results,the weakness parts are strengthened in the stage of structural design.The characteristics of bearing capacity and deformation capacity are obtained by experimental study on critical joints combined with numerical analysis. For the long-span steel structure,hoisting sequence,shrinkage and creep effects of main towers are influence factors on the stress of the link-bridge.The construction phase analysis is carried out.Through variety of feasible installation scheme contrastive analysis to determine the reasonable construction sequence so that to minimize the initial stress and initial deformation of the interior structure as much as possible during the construction.%招商银行上海大厦连桥部分为采用强连接的高位大跨度连体结构，属于复杂高层建筑。介绍了该结构的分析和设计方法。通过弹塑性动力时程分析与振动台试验结果进行对比，得到结构构件从弹性—开裂—弹塑性—承载力下降的全过程曲线，找出结构构件出现塑性铰的先后顺序、塑性铰的分布及结构的薄弱部位，有针对性地进行结构加强。对关键节点进行节点试验研究，与有限元计算分析相结合，来分析其承载能力及变形能力。对于类似大跨度钢结构，考虑到吊装次序以及两侧钢筋混凝土筒体的收缩徐变对钢结构连桥应力的影响，须进行施工阶段的验算。通过多种可行安装方案的对比分析，确定更为合理的施工顺序，尽可能减小施工期间结构内部的初始应力和初始变形。