起伏地形下复杂形体大跨网格结构风压与等效静风荷载数值模拟

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.

Numerical Simulation of Wind Pressure and Wind-Induced Dynamic Responses of an Umbrella Shaped Membrane Structure

Abstract： By using commercial software ADINA, the numerical simulation of the wind pressures and wind-induced dynamic responses of an umbrella shaped tension membrane structure were performed. Some key effects including wind-induced dynamical displacements, velocities, accelerations and equivalent stresses of the membrane structure were systematically investigated. Moreover, the effect of several important parameters on wind pressures and structural wind induced dynamic responses was summarized, such as structural rise-span ratio, incoming wind direction, membrane initial pre tension and opening/closure forms in the membrane hat. Furthermore, the structural wind induced responses and wind pressure coefficients were obtained. The present results can provide reference for the wind resistant design of similar tension membrane structures.