基于时域分析方法对简支梁式屋盖结构在雷暴冲击风作用下的风振响应进行参数化研究。利用混合随机模型对雷暴冲击风强风荷载进行数值模拟，其中平均风采用Wood竖直风剖面方程与Holmes经验模型模拟，脉动风采用基于Kaimal目标谱的自回归AR模型模拟，谱分析结果表明雷暴风模拟结果具有较好的精度；分析了结构主要参数和雷暴风参数对结构风振响应的影响，结果表明：结构刚度、跨度、最大风速半径及风暴移动速度对结构的风振响应影响较大。针对雷暴风中平均风和脉动风响应均随时间变化的特性，采用基于包络概念的整体风振系数计算方法，分别研究了不同参数下的整体位移风振系数和整体荷载风振系数，结果表明，采用结构整体位移风振系数进行雷暴风等效静风荷载分析具有更高的精度。
Abstract
Based on the time-domain analytical method, the wind-induced response of a simple supported beam roof structure under the downburst was studied by parameter analysis. This paper selected a hybrid stochastic model to simulate the strong wind load of downburst, where mean wind speed was simulated by the Wood vertical profile equation of wind and the Holmes’ empirical model and fluctuating wind speed was simulated by AR model based on Kaimal target spectrum. Spectral analysis results show that the simulated results of downburst have a good accuracy. This paper analyzed the influences of both main structural parameters and downburst parameters on structural wind-induced response. The results show that the stiffness, span, maximum wind speed radius and the velocity of storm moving have great influences on structural wind-induced response. Given the characteristics that both mean wind speed and fluctuating wind speed response are time-varying, this paper adopted the global wind-induced coefficient calculation method which is based on the envelope concept, where the global displacement wind-induced coefficient and the global load wind-induced coefficient under different parameters were studied respectively. The results show that adopting the structural global displacement wind-induced coefficient to calculate equivalent static wind load of downburst have a higheraccuracy.
关键词
雷暴冲击风 /
混合随机模型 /
参数分析 /
风振系数
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Key words
downburst;hybrid stochastic model /
parameter analysis /
wind-induced coefficient
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