【摘要】 气承式膜结构在风、雪等荷载作用下会发生索膜分离,现有设计方法多采用索网与膜面绑定进行计算.本文使用有限元软件ANSYS建立气承式膜结构受外荷载作用下考虑索膜分离的索滑动模型,研究不同内压与外荷载作用下索膜顶点位移与索力变化规律,同时进行试验验证,并将试验结果与有限元模拟结果进行对比分析.结果表明:目前常用的绑定模型加载区域索网对膜面约束作用被高估,膜面位移会明显小于滑动模型;滑动模型可较准确地模拟索膜分离情况;滑动模型索力和膜面位移变化趋势与试验结果更为吻合,可以更准确地进行气承式膜结构在静力荷载作用下的响应分析.更多还原

【Abstract】 Under the action of wind,snow and other loads,the air-supported membrane structure will have separation contact states between the cable and membrane.However,the finite element analysis method currently needs experimental verification.Therefore,this paper uses ANSYS to establish the cablemembrane separation model of air-supported membrane structure under external load.The cablemembrane separation phenomenon,vertex displacement and cable force of air-supported membrane structure under different internal pressure and external load are obtained.Then a verification test under different internal pressure conditions is designed and the test results are compared with the finite element simulation results.The results show that the restraint effect of the cable net on the membrane surface in the load area of the binding model is overestimated,and the membrane displacement is obviously smaller than that of the sliding model.The sliding model can simulate the separation of cable and membrane,and the separation area between cable and membrane will increase with the increase of external load.When the external load is fixed,the cable force increases with the increase of internal pressure.Both the variation trend of cable force and membrane displacement of the sliding model are more consistent with the experimental results,and the response analysis of air-supported membrane structure under static load can be more accurate.更多还原