虹桥综合交通枢纽弱连体结构的抗震设计与分析

Seismic Design and Dynamic Analysis of Hongqiao Integrated Transport Hub with a Weakly Connected Structure

连体结构是一类复杂的建筑结构形式,连廊连接方式不利时可能严重影响主体结构的抗震性能,必需应用合理的技术方案和分析手段以保证结构的抗震可靠性。作为上海市的重点建设项目,虹桥综合交通枢纽工程的东交通中心和西航站楼存在体型复杂和竖向刚度不规则等多项单体超限内容,而高空连廊搭接方案进一步加大了结构设计难度,经多次技术论证,确定采用弱连接方案。为验证该方案的可靠性,提出了一种基于LS-DYNA程序和自编子程序的弹塑性时程分析方法,其可靠性得到了试验数据的有力支持,而以"角点应变法"为基础的塑性铰简化评价方法也为结构抗震性能评估提供了一种新的尺度。计算结果表明,弱连接设计条件下的主体结构具有良好的抗震性能,连廊在一定程度上有助于减缓主体结构的动力需求。

Connected structure is one kind of building systems with mostly comprehensive behaviors,where unreasonable corridor design could be adverse to the seismic performance of main structure,thus,good technologies and tools in the phase of design and analysis should be adopted for ensuring the structural reliability.As one of key construction projects in Shanghai,the East Transport Central and West Terminal Building of Hongqiao Integrated Transport Hub had several overrunning items,such as complex shape in plane and irregularity of vertical stiffness,furthermore,the high construction for corridor increased the difficulty of structural design.According to many technical demonstrations,the weak connection principle was approved and its feasibility was proofed by a new history analysis method.This method was based on LSDYNA program and user subroutine with good supports by experimental results,and one corner-point strain method for accessing roughly plastic hinge was also put forward.The results show that the main structures are of good seismic performance and their dynamic demands could be reduced by the corridor with a weak connection.