基于非定常风荷载的大跨体育场挑篷结构风致响应

Wind-Induced Responses of a Stadium Canopy Roof Based on Non-Steady Wind Pressure

基于刚性模型风洞试验,对一个实际体育场弧形挑篷结构进行风致响应研究,采用平稳激励下随机振动的模态叠加法(CQC法)进行计算.分析了结构的风致响应,比较了挑篷前缘迎风和处于自身尾流区域时风致响应的不同特点.计算结果表明,挑篷前缘处于迎风侧时出现最大响应峰值,而当前缘处于自身尾流区域时结构的响应相对较小;挑篷前缘迎风时背景响应贡献相对尾流区域时的情况大,并且此时阵风响应因子相对较小.

Wind-induced responses of a stadium canopy roof structure are computed on the basis of the results of rigid model wind tunnel test and the mode-superposition method （CQC method） is adopted in computation of the dynamic responses. The characteristics of the wind-induced responses for different wind directions （especially for the end of cantilevered roof windward/leeward） are investigated. Calculation results show that when the end of cantilevered roof is on the windward side, the largest peak responses occur; while the wind-induced responses are much smaller for the end of cantilevered roof on the leeward side. The background components generally make more contributions when the end of cantilevered roof is on the windward side, and gust response factors are smaller when the end of cantilevered roof is on the leeward side.