世博轴索膜结构风振响应数值模拟  

Numerical simulation on wind-induced response of membrane structure of the Expo Axis

作　　者：汪大绥[1] 卢旦[2] 李承铭[2] 

机构地区：[1]华东建筑设计研究院有限公司,上海200002 [2]上海现代建筑设计(集团)有限公司,上海200041

出　　处：《建筑结构学报》2010年第5期49-54,共6页Journal of Building Structures

基　　金：上海市科学技术委员会科研计划项目世博科技专项:世博轴及地下综合体关键技术研究(08dz0580300);国家科技支撑计划项目世博科技专项:世博轴及地下综合体关键技术研究(2009BAK43B06)

摘　　要：将风速时程作为数值风洞的入口边界条件,采用非稳态计算方法,获得了世博轴索膜结构的表面风压时程。将该风压时程的统计平均值与采用稳态计算得到的平均风压做比较,验证了前者的准确性。分析结果表明:利用数值风洞非稳态计算获得的阵风系数将比现行《建筑结构荷载规范》中的数据更能反映脉动风的空间分布特性;由于风速模拟和数值风洞分别考虑了风荷载时间和空间的相关性,动力时程分析又包含了结构高阶振型的影响,将非稳态计算得到的风荷载时程直接加载到有限元模型上进行动力时程分析,与采用风振系数的等效静力风荷载方法相比,能较好地反映结构的实际风振情况。With the wind speed time history as the wind tunnel boundary conditions,the wind load time history on membrane structure of the Expo Axis was obtained by using unsteady state calculation.The precision of the unsteady state simulation was verified by comparison of the mean wind pressure using steady state calculation and the statistical average of the wind load time history.Analytical results indicate that the unsteady state simulation can take the spatial distribution of the fluctuating wind load into account.The wind loads from CFD simulation are directly acted on the FEM nodes to calculate the dynamic responses in time domain.The results show that the method can take spatial-temporal correlation of wind and higher modes influence into account.Therefore,wind-induced vibration can be described more accurately.

关 键 词：膜结构 数值风洞 非稳态计算 风振响应 抗风设计 

分 类 号：TU393.3[建筑科学—结构工程] TU312.1