雷暴风激励下简支梁式屋盖结构的风振响应参数化分析

发布时间：2018-03-23 15:15

本文选题：雷暴冲击风　切入点：混合随机模型　出处：《振动与冲击》2017年17期

【摘要】：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 analysis method, the wind-induced vibration response of a simply supported beam roof structure under thunderstorm impact wind is parameterized. A mixed stochastic model is used to simulate the strong wind load of a simple beam roof structure. The average wind is simulated by Wood vertical wind profile equation and Holmes empirical model, and the pulsation wind is simulated by autoregressive AR model based on Kaimal target spectrum. The spectral analysis results show that the simulation results of thunderstorm have good accuracy. The influence of the main structural parameters and thunderstorm parameters on the wind-induced vibration response of the structure is analyzed. The results show that the stiffness and span of the structure, The maximum radius of wind speed and the speed of storm movement have great influence on the wind-induced vibration response of the structure. In view of the time-dependent characteristics of the average wind and pulsating wind responses in thunderstorm, a method based on envelope concept is used to calculate the overall wind-induced vibration coefficient. The wind vibration coefficient of the whole displacement and the wind vibration coefficient of the whole load are studied respectively under different parameters. The results show that the wind vibration coefficient of the whole displacement of the structure is more accurate for the equivalent static wind load analysis of the thunderstorm.
【作者单位】：东南大学混凝土及预应力混凝土结构教育部重点实验室;
【基金】：国家自然科学基金(51208095) 江苏省“青蓝工程” 江苏省六大人才高峰(JZ-002)
【分类号】：TU312.1

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