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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.
According to computational fluid dynamics (CFD) and finite element dynamic time-history method, the pulsating wind characteristics were numerically simulated to obtain the time history of the pulsating wind speed and used as the inlet boundary conditions for the numerical wind tunnel simulation.Using FLUENT to simulate the long-span arch structure The unsteady wind-induced structural loads under the action of fluctuating wind are obtained, and the time-dependent wind pressure loads acting on the structure are obtained.The wind-induced vibration response of the structure is calculated by ANSYS, and the equivalent static wind load based on the wind-induced response time is obtained. Based on this, the definition of multi-objective equivalent static wind load weighted combination coefficient is proposed, and the multi-objective equivalent static wind load of long-span arch structure is calculated and verified. The results show that the equivalent static wind Under load, the calculated result of the static response of the structure agrees with the extreme value of the wind-induced dynamic time-history response.