空间结构风场风载的数值模拟

基于计算流体动力学理论的空间结构风场风载数值模拟方法,研究了具有复杂体型的空间结构形体表面及其周围的风场,确定空间结构的风压分布,进而得到结构表面风载体型系数,并与相应风洞模型实验结果比较,结果验证了数值模拟方法的正确性.利用数值方法模拟了当存在阻挡建筑物时目标建筑物周围风场和表面风载体型系数的改变,分析了风场变化的原因,讨论了何种情况下必须考虑阻挡建筑物的影响.又基于结构表面等压线将结构表面划分为结构受风子区块,并以面积加权平均计算得到各子区的风载体型系数,为抗风设计提供了可靠依据.

The Numerical Simulation for the Wind Fields and Wind Loads Around Spatial Structures

The numerical simulation approach,which is based on computational fluid dynamics(CFD),was be introduced to study the wind fields of complicated structural shapes and wind-loads acting on the targeted structural system.The wind fields around the spatial structures and the wind-load form coefficients were given numerically and visually.And some comparisons between the numerical results and wind tunnel model test data were carried out.The changes of the wind-load form coefficients and wind fields around the structures caused by other structural system were analyzed.Based on the wind pressure contours or constant value lines of wind-load form coefficients,the sub-domains subjected to different wind loads were decided and the local wind-load form coefficients corresponding to these sub-domains were gotten according to the area weighted average.Besides,the wind-load form coefficients under different wind angles were investigated.