长沙南站钢屋盖结构设计与分析

Structural design and analysis of a complex spatial grid structure for South Changsha Railway Station

长沙南站是武广客运专线上的一个大型枢纽站,其A,B区上部大跨钢屋盖为曲面空间网格结构,局部采光顶屋面为张弦梁结构,网格厚度为3.6m;网格结构采用了多点支承,支承结构为钢管柱和多级分叉树形柱。为了满足建筑效果及节点承载力的需要,部分节点采用了铸钢节点,并对该类型节点进行了节点试验和有限元分析;工程通过风洞试验及风振分析解决了抗风问题,归纳了长沙南站屋面工程风荷载的分布规律。工程安装方案采用了改进版的分块吊装法施工,设计中用SAP2000软件进行了全过程的施工模拟分析,并比较了考虑施工模拟工况后对分析结果的影响。介绍了该复杂空间网壳结构的造型、布置、结构建模、节点设计、抗风计算、施工模拟和结构分析。

South Changsha Railway Station is a large hub station on the Wuhan-Guangzhou Passenger＇s Express Railway.The long-span steel roof in sections A and B is an extremely complex spatial grid structure,and the local skylight roof structure is an beam string structure.The grid thickness is 3.6m.Latticed shell bearings have been designed as a multi-point support system,which includes steel pipe columns and multi-stage branching tree columns.In order to meet the requirement of the building architectural style and the joint carrying capacity,the cast steel nodes were used,and a particular joint test and finite element analysis had been conducted for the nodes.Through wind tunnel tests and wind-induced vibration analysis,the wind problem was solved.The distribution of wind loads for the roof of South Changsha Railway Station was summarized.The scheme of installing roof structure is an improved version of the lifting block construction method,which was analyzed by using SAP2000 to simulate the whole process of construction,and the results of considering post-construction simulation or not were compared.The structural shape,layout,modeling,node design,wind calculation,construction simulation and structural analysis of the complex spatial latticed shell were presented in detail.