大跨度拱形结构等效静风荷载研究（英文）

Equivalent static wind loads for long-span open-style arched structure

根据计算流体动力学方法(CFD)以及有限元动力时程分析法数值模拟脉动风特性,获取脉动风速时程,并以此作为数值风洞模拟的入口边界条件.运用FLUENT对大跨度拱形结构进行脉动风作用下的结构非稳态分析,得到作用于结构的时程风压荷载.运用ANSYS进行结构的风振响应计算,分析得到基于结构风振响应时程的等效静风荷载.在此基础上提出多目标等效静风荷载加权组合系数的定义,计算获得大跨度拱形结构的多目标等效静风荷载,并验证其计算精度.研究表明,在文中方法所得等效静风荷载作用下,结构静力响应计算结果与风振动力时程响应极值吻合.

Based on computational fluid dynamics（CFD）and dynamic time-history analysis method,the fluctuating wind was investigated by numerical simulation to obtain time-history series of wind velocity,which would be used as wind inlet boundary condition.In order to get time-history series of wind pressure distribution on the structural surface,a long-span arched structure was computed by FLUENT using unsteady-state analysis. Wind-induced vibration responses of the structure are analyzed by ANSYS and the equivalent static wind loads based on the structural time-history responses were obtained.After that,the definition of multi-objective equivalent static wind load（ESWL）combination factors was put forward and the multi-objective ESWLs of an open-style long-span arched structure were obtained, whose accuracy were numerically verified.The results shows that the structural static responses under ESWLs are in good agreement with the extreme responses under the practical wind actions.