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  

Simulation of Wind Pressure Distribution and Equivalent Static Wind Loads of a Complex Longspan Dome Grid Structure Under Undulating Terrains

作　　者：乔帅斌 卢旦 马宁[1] 周岱[1] 王子通 

机构地区：[1]上海交通大学船舶海洋与建筑工程学院,上海200240 [2]上海现代建筑设计集团技术中心,上海200040

出　　处：《上海交通大学学报》2014年第11期1562-1567,1573,共7页Journal of Shanghai Jiaotong University

基　　金：国家自然科学基金项目(11172174;51278297);海洋工程国家重点实验室自主研究课题(GKZD010063);高等学校博士学科点专项科研基金项目(20130073110096)资助

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.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.

关 键 词：大跨度穹顶网格结构 风载体型系数 风振动力放大因子 等效静风荷载 

分 类 号：TU312.1[建筑科学—结构工程] TU317.1