摘要
三门金鳞体育中心地处海湾,风荷载很大。主体育场东西看台上的两片屋盖钢罩棚关于东西和南北都对称,采用四管桁架悬挑结构体系。为了抵抗风吸力下的向上变形,共设置八道斜拉索。计算索结构时必须考虑几何非线性的影响,这将增加结构计算分析的难度、降低计算速度。设计开始阶段用拉杆代替拉索,建立两个等效计算模型:无索风压模型和拉杆风吸模型,初步确定杆件大小;根据拉杆风吸模型中拉杆的内力选择拉索大小;然后建立带拉索的真实模型进行复核,并分析整体结构的强度和稳定性。同时利用拆除构件法进行风荷载下拉索断裂后屋盖钢结构的防连续倒塌验算。分析结果表明,该结构是安全的,能够满足较大风压下承载能力和正常使用的要求。即使中间2根拉索在最大设计风荷载下发生断裂,也并不会引起体育场钢罩棚的倒塌。
Sanmen Jinlin Sport Center Stadium locates in the gulf, so wind load is great. Two piece of canopy shells above the east and west stands are symmetrical about the west-east and north-south axial, and composite by four-tube cantilever truss structure system. Eight cables are used to control the upward deformation under wind uplift. Because it＇ s hard to calculate the geometric nonlinear effect of cables, pull rods take place of cables in the beginning of design, accordingly easily to decide the cross section of all members through two equal calculation models： no-cable-pressure model and pull- rod-suction model. Then the final model composed by not pull rods but cables are set up to check all members. The strength and stability of the canopy shell is analyzed. Moreover, the safety of the steel roof after some cables under wind load is checked by alternative path method for progressive-collapse-resistance design. It shows that this canopy shell is safe and can meet the requirement of bearing capacity and normal use especially under strong wind load, which two middle cables failure will not cause the collapse of the steel canopy shell.
出处
《建筑结构》
CSCD
北大核心
2012年第8期27-32,共6页
Building Structure
