一种民用气肋式膜结构建筑失效机理

为研究大跨度膜结构建筑在多变环境下结构的稳定性,对组成某膜结构建筑的膜材进行了拉伸试验,并采用SOLIDWORKS软件建立了膜结构建筑的1:1几何模型,基于有限元理论建立了膜结构建筑静力学分析模型,得出其等效应力云图.为简化分析步骤,利用ANSYS软件建立膜结构建筑十字连接口处的静力学分析模型,分析了膜结构建筑在不同温度、不同气肋直径和不同内压条件下的变化规律.研究结果表明:直径为335 mm的膜结构建筑,内压力从0.018 MPa增加到0.022 MPa时,膜面最大应力从48.14 MPa增加到58.84 MPa,加大了膜材的负荷;在不考虑安全系数的情况下,膜材的适用温度从70℃降到56℃以下,表明使用该膜材的膜结构建筑不能持续在高温下工作. 

Failure Mechanism of Civil Membrane-Structure Architecture with Gas Rib

In order to study the stability of a long-span membrane structure in varied environment, tensile tests of the membrane materials were carried out. A 1:1 geometric model of the membrane structure architecture was established using SOLIDWORKS software. Based on the finite element theory, a static analysis model for the membrane structure was proposed to obtain its equivalent stress nephogram. To simplify the analysis steps, parametric modeling of ANSYS software was employed to establish the static analysis model at cross connector of the membrane structure, with which variation rules of the membrane structure were analyzed under different temperatures, gas rib diameters, and internal pressures. The results show that for membrane structures with a diameter of 335 mm, the maximum stress in membrane surface increased from 48.14 to 58.84 MPa as the internal pressure increased from 0.018 to 0.022 MPa, which would greatly increase the load of membrane materials. If taking no account of the security coefficient, the appropriate temperature of membrane materials would decrease from 70 to below 56℃, indicating that membrane structures made of the membrane material cannot sustain high temperature working conditions.