大跨拱形结构等效静力风荷载

Equivalent Static Wind Loads on Large-Span Arched Structures

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） and the finite element dynamic time-history.analy- sis method, the time-history speed of fluctuating wind was simulated by using the numerical method which was used as inlet boundary condition of numerical wind tunnel. Then, non-steady-state analysis on a large- span arched structure was made by using the FLUENT software to get the time-history wind loads. Mean- while, the wind-induced vibration response was analyzed using the ANSYS software. After that, equiva- lent static wind loads （ESWL） based on time history response were obtained and the definition of multi-ob- jective ESWL combination factors was proposed. Finally, the multi-objective ESWL of the open large-span arched structure were obtained with their accuracy verified. The study shows that the static response val- ues under ESWL and extreme response values in dynamic analysis are in good agreement.