大跨度悬挑桁架结构体系及稳定性研究

Research on the Structure System and Stability of Long Span Cantilevered Truss

文章借助有限元软件SAP2000,对某体育场悬挑雨棚结构进行数字化建模,研究其受力以及体系的稳定性。对屋盖的各个悬挑桁架以及桁架上下弦杆平面支撑的设置情况进行几何构成分析,结果表明屋盖结构为几何不变体系。通过改变柱间支撑的设置情况来进行整体稳定分析,分析结果表明,屋盖的竖向受力构件及其支撑体系稳定性满足要求,横向垂直支托桁架面外位移值可控,悬挑架下弦杆件不会出现失稳的情况。

This article employs the finite element software SAP2000 to digitally model the suspended canopy structure of a sports stadium,examining its load-bearing characteristics and structural stability.Geometric composition analysis is conducted for the various cantilever trusses of the roof,as well as the arrangement of upper and lower chord members in the support plane.The findings suggest that the roof structure maintains geometric stability.Comprehensive stability analysis is performed by modifying the placement of column supports,and the results indicate that the vertical load-bearing components of the roof and their support system meet the necessary stability criteria.The lateral vertical support truss displacements are within limits,and there is no occurrence of instability in the lower chord members of the cantilever trusses.