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基于计算流体动力学(CFD)方法和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,以此作为数值风洞模拟的入口边界条件.运用FLUENT软件对大跨拱形结构进行脉动风作用下结构的非稳态分析,得到作用于结构的时程风压荷载;运用ANSYS分析软件进行结构的风振响应计算,分析获得了基于结构风振响应时程的等效静力风荷载.提出多目标等效静力风荷载加权组合系数的定义,计算获得了大跨拱形结构的多目标等效静力风荷载,并验证了其计算精度.研究结果表明,在基于该方法所得等效静力风荷载作用下,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) method and finite element dynamic time-history analysis method, the characteristics of pulsating wind were numerically simulated and the time history of pulsating wind speed was obtained as the inlet boundary conditions for numerical wind tunnel simulation.Using FLUENT software, The structure is subjected to the unsteady analysis of the structure under fluctuating wind and the time-course wind pressure load acting on the structure is obtained. The wind-induced vibration response of the structure is calculated by ANSYS analysis software, and the equivalent static Wind power load.A 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 obtained and its calculation accuracy is verified. The results show that, Under the equivalent static wind load obtained by the method, the calculated results of the static response of the structure agree well with the extreme values of the wind-induced dynamic time-history response.