复杂曲面膜结构风致响应的实验研究与模拟

Wind Tunnel Test and Numerical Simulation on Wind-Induced Response of Complex Membrane Structure

以上海世博轴膜屋面为工程背景,进行了复杂曲面膜结构节段的气弹模型风洞实验研究和考虑流固耦合作用的数值模拟分析。考虑不同膜面预应力、风向角、风速以及流场情况,采集得到了膜结构的位移和加速度响应,进一步了解复杂曲面膜结构的风振响应特性,数值模拟分析与风洞实验结果一致。获得了复杂曲面膜结构的风振响应特性,统计得到了膜结构的位移效应风振系数。通过分析可知,膜结构本身的形状特征、初始预应力强弱、流场条件和场地类别都会对膜结构的风振产生影响。

The complex membrane structure is typical of wind-sensitive structures.As the membrane structure is light and soft,aeroelastic model test of membrane structure is difficult.The membrane roof of Shanghai Expo Axis is taken as the background of the work.The aeroelastic model wind tunnel test and the numerical simulation considering fluid and structure coupling are carried out on a segment of a membrane structure with complex surface.Different membrane pre-stresses,wind directions,wind speeds,and flow fields are taken in the test.The responses of the membrane structures including the deflection and acceleration time histories are obtained.The numerical simulation results coincide with those from the wind tunnel test.The wind-induced response characteristics of the membrane structure with complex surfaces are captured and the wind vibration coefficients based on the deflection are statistically obtained by the work.