摘要
利用薄壳无矩理论考虑预应力、内压两因素,得到了气承式充气膜结构找形解析公式。采用非线性有限元方法对气承式充气膜结构进行找形分析,利用现有的判别准则对找形后的模型进行判断,以保证模型建立的准确性。根据我国风荷载计算规范,同时结合澳大利亚规范中对穹顶式结构的风荷载体型系数取值,计算24.5 m/s风速作用下等效静力风荷载。通过对改变薄膜厚度、内压以及采取加强索的方式,来对比分析气承式充气膜结构力学性能。膜厚和内压的增加更有利于抵抗外部风荷载,提高整体刚度。最大最小应力之差较小符合实际情况。施加索时,可以降低结构在风载作用下的位移,应力分布更均匀。
Considering the pre-stressing force and the internal pressure,the form-finding analytical formulas of airsupported membrane structures are got with non-moment shell theory.The nonlinear finite element method is applied to analyze the form-finding of the air-supported membrane structures,the existing criterion is presented to judge the form-found model,for guaranteeing the accuracy of the model shape.The 24.5 m / s equivalent static wind load is calculated by Chinese Code.The shape coefficient of the wind load for the dome structures refers to Australia Code.The mechanical properties of the air-supported membrane structures are analyzed and compared by changing the film thickness and the internal pressures as well as enhancing cables.Increasing the film thickness and the internal pressure is a benefit to resist the external wind loads and improve the overall stiffness.The difference between the maximum and minimum stress is small,which meets the actual situation.The displacement of the structure under the wind loads can be reduced after the cables are exerted,and the stress distribution is more reasonable.
出处
《工业建筑》
CSCD
北大核心
2013年第S1期349-353,共5页
Industrial Construction
基金
合肥工业大学建筑设计研究院科学研究发展基金项目
合肥工业大学校基金
关键词
气承式充气膜结构
找形分析
体型系数
几何非线性
风荷载
air-supported membrane structure
form-finding analysis
shape coefficient
geometrical nonlinear
wind load
