【摘要】 研究了伞形膜结构在暴雨荷载作用下的动力响应问题。通过研究雨滴谱、雨滴体积占有率、雨滴降落末速度等暴雨荷载的计算参数,建立了雨荷载计算模型。利用Ansys和Fluent有限元分析软件对伞形张拉膜结构在暴雨荷载作用下的动力响应进行分析,并得到其动力响应规律。进行了人工模拟暴雨荷载试验,模拟了三种不同强度的暴雨荷载对伞形膜结构的作用,并将试验所得结果与数值模拟结果进行了比较。研究结果表明,虽然极端暴雨不能使膜结构直接发生破坏,但暴雨荷载会使膜面产生松弛,松弛率最高达到11.0%,平均为8.14%,从而降低其失稳临界风速,而影响结构安全。研究结果为张拉膜的安全设计提供了相应的理论参考依据,丰富了膜结构设计、建造和维护理论。更多还原

【Abstract】 The dynamic response of a umbrella-shaped membrane structure under the load of heavy rainfall was studied. Firstly, a rainfall load calculation model was established by studying the calculation parameters of rain load, such as raindrop spectrum, raindrop volume occupancy, raindrop final velocity and so on. Then, Ansys and Fluent finite element analysis software were used to analyze the dynamic response of the umbrella-shaped membrane structure under the heavy rainfall load, and its dynamic response regularity was obtained. Finally, a artificial heavy rainfall impact test was conducted to simulate the impact of three kinds of heavy rainfalls with different intensities on the umbrella-shaped membrane structure, and the experimental results were compared with numerical simulation results. The results show that although the extreme rainfall can not directly damage the membrane structure, the heavy rainfall load will relax the membrane surface, with the maximum relaxation rate of 11.0% and the average of 8.14%, and reduce the critical wind speed of the instability and affect the safety of the structure. The results provide theoretical reference for dynamic design of tensioned membrane and enrich the theory of membrane structure design and construction.更多还原