中文摘要：

以大跨空间建筑结构实际工程为对象,数值模拟分析复杂形体大跨网格结构在起伏地形下的风压分布、风载体型系数和等效静风荷载.运用Fluent软件计算不同风向角下的结构风载体型系数,发现风向角对结构风载体型系数影响较大.基于谐波叠加法模拟生成风速时程并转化为风压时程,采用ANSYS软件建立结构有限元模型,施加模拟所得的风压时程和风载体型系数,分析结构风致动力效应.定义风振动力放大因子以考虑共振响应的影响,并将其与特定时刻的瞬时风压分布相结合以形成结构的等效静风荷载.数值计算分析了基于基底竖向反力最小值的等效静风荷载及其分布.

英文摘要：

The wind pressure distribution, wind-load shape coefficients and equivalent static wind loads of a complex longspan dome-grid structure under undulating terrains were numerically simulated using FLUENT. The results show that the distribution of wind load shape coefficients are quite different with the change of the wind direction. The time-history series of wind velocity was simulated based on the harmonic superposition method and then turned into the time-history series of wind pressure. The FEM model of the structural system was constituted by using ANSYS and the structural wind-induced responses and wind load shape coefficients were obtained based on the time-history series of wind-pressure. The wind-induced dynamic amplification factor was defined, so the structural resonant responses could be considered. Then,the wind-induced dynamic amplification factor was combined with the distribution of instantaneous wind pressure at the given time and the equivalent static wind loads of the structural system were established. The numerical analysis reveals the distribution of equivalent static wind loads based on the minimum verti- cal reaction forces of structural system.