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对单层折面空间网格结构的表面风压分布和风振响应特性进行研究,采用荷载-响应相关法(LRC)与惯性力法计算结构的等效静风荷载,并分析了其计算精度,结果表明:在迎风面的体育场屋盖部分,气流在经过迎风面屋盖檐口后发生明显分离,形成漩涡,此处的平均负风压和脉动风压最大;整个屋面的绝大部分表面风压都表现为负压。增加肩谷环后,结构横向刚度提高较大,结构的1阶和2阶振型由原来的结构整体水平振动变为罩棚前端内环端部的局部竖向振动;在单层折面空间网格结构的风振响应中,参与结构振动振型较多,需要考虑多阶振型影响,且参与结构振动的主要为低阶振型;在脉动风荷载作用下各振型耦合作用较小;用LRC与惯性力法得到的单层折面空间网格结构等效静风荷载,计算精度可满足工程要求。
The surface wind pressure distribution and wind vibration response characteristics of the single-layer folded-face grid structure are studied. The equivalent static wind load of the structure is calculated by the load-response correlation method (LRC) and the inertial force method, and the calculation precision, The results show that on the windward side of the stadium roof, the air flow obviously separates after passing through the roof of the windward roof to form a whirlpool, where the average negative pressure and fluctuating wind pressure are the largest. Most of the surface wind pressure All show negative pressure. After increasing the Shura valley, the transverse stiffness of the structure increases greatly. The first and second modes of the structure change from the original horizontal vibration of the whole structure to the local vertical vibration of the end of the inner ring of the canopy roof. Among the wind-induced vibration responses of the lattice structure, there are many vibration modes involved in the structure, which need to consider the influence of multi-order mode shapes, and the main vibration modes of the structure involved are low-order mode shapes. Equivalent static wind load of single-layer folded-surface space grid structure obtained by LRC and inertial force method can meet the engineering requirements.