考虑流固耦合作用的气膜建筑力学性能分析

本文以气承式半圆柱形气膜结构为研究对象，通过数值计算分析的手段，研究了气膜结构在风场流固耦合作用下的影响。其中，选用基于雷诺平均法的RNG k-ε 两方程涡粘模型进行风场模拟，采用弱流固耦合分析方法模拟流固耦合风荷载效应。根据0°和30°两种风向角度，在风荷载对结构的静力工况和考虑流固耦合作用工况下，讨论研究对象处于12m/s、15m/s、18m/s不同外界风速及200Pa、230Pa、260Pa不同空气内压条件下的应力值和位移值，分析气膜结构的流固耦合效应的作用机制和影响系数。结果表明，考虑流固耦合时，气膜的位移和应力最大值要高于静力工况，得到结构流固耦合作用相比于静力工况对气膜位移、应力数值的放大系数；且流固耦合作用对气膜位移的影响系数均随内压和风速呈负相关性，而0°风向角时，应力影响系数随气膜内压与风速呈正相关性，30°风向角时，与之相反。

Analysis on mechanical properties of inflatable membrane architecture considering fluid-structure interaction

In this paper, the air-supported semi-cylindrical inflatable membrane structure was taken as the research object. Through numerical calculation and analysis, the influence mechanism of inflatable membrane structure under the fluid-structure interaction of wind was studied. The wind field was simulated by the RNG model, and the weak coupled algorithm was used to simulate the structure. According to the two wind direction with the angles of 0 and 30, under static condition and fluid-structure interaction conditions, the stress and displacement under the case of velocity being 12 m/s, 15m/s 18m/s was carried out. Besides, the pressure of 200MPa, 230MPa and 260MPa was analyzed the action mechanism and influence coefficient of fluid-structure interaction of the air membrane structure. The results show that in the case of fluid-structure interaction, the displacement and the maximum stress of the inflatable membrane are higher than the static condition. And the amplification coefficient of the displacement and stress was obtained. The influence coefficient of fluid-structure interaction is negatively correlated with the internal pressure and the wind speed, while the stress coefficient is positively correlated with the internal pressure and the wind speed in the case of 30 angle.