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于家堡单层网壳体型较复杂,对雪荷载的选取应谨慎.基于CFD技术分别采用求解雪相控制方程和MIXTURE多相流模型对网壳表面风致雪漂进行数值模拟,得到屋盖表面雪沉积与侵蚀后形成的不均匀雪荷载.两种求解方法得到的雪荷载分布较一致,屋盖迎风面发生积雪侵蚀,随屋盖高度增加雪荷载呈抛物线形减小,至屋盖顶部天窗两侧雪侵蚀作用最大、雪压最小,天窗后部背风面处发生积雪沉积.对结构的静力和整体稳定性能进行分析,在不均匀雪荷载作用下天窗两侧部分杆件应力较均匀雪荷载时增大10%,结构极限承载力增大3%.
Yujiapu monolayer net shell type is more complex, and the selection of snow load should be cautious.According to the CFD technique, the snow phase drift and snow drift on the net shell surface are numerically simulated by using the snow phase control equation and MIXTURE multi-phase flow model respectively, Snow deposition and erosion after the formation of non-uniform snow load.The two solutions obtained by the snow load distribution is more uniform, the snow cover on the windward side of the snow cover, with the increase in roof height, the snow load decreases parabolically to the top of the roof Snow erosion on both sides of the skylight is the largest with the least snow pressure and snow deposition occurs at the leeward of the rear of the skylight.The static and overall stability of the structure are analyzed.The stress of some bars on both sides of the skylight Uniform snow load increased by 10%, the structure of the ultimate bearing capacity increased by 3%.