高层建筑屋顶广告牌风致响应分析

摘要

基于刚性模型测压风洞试验数据，采用时程分析法对高层建筑屋顶广告牌的风致响应进行了研究，并分析了单边布置、邻边布置、三边布置及四边布置广告牌对风致响应的影响。结果显示，高层屋顶广告牌单边布置时面板受力最大，而三边布置广告牌时面板受力最小；面板中间位置的斜撑单元对风荷载最为敏感，靠近面板迎风侧的立柱单元内力响应相对较大，面板中心位置的横向单元内力响应最大；不同的广告牌布置方式下，各类单元的阵风响应因子差别都不超过0．1。而同一种广告牌布置方式下各类单元之间的阵风响应因子差别最大为0．3；建议计算高层屋顶广告牌等效静力风荷载时，可偏保守地将阵风响应因子统一取为1．6。%Based on rigid model wind tunnel tests,wind-induced responses of billboards on high-rise building roof were studied using the time history analysis method,and the influences of unilateral,adjacent bi-lateral,tri-lateral,and quadri-lateral billboard arrangements on the wind-induced responses were analyzed.The results showed that the wind loading on face panels is the maximum under unilateral arrangement,and the minimum under tri-lateral arrangement;the diagonal brace element at the middle position of face panels is most sensitive to wind loading.The internal force response of the vertical prop element near windward side of face panels is larger relatively,the internal force response of the lateral beam element at the middle position of face panels is the largest;under different billboard arrangements,the gust response factor differences of all kinds of elements are not more than 0.1 ,under the same billboard arrangement,their maximum difference is 0.3;a conservative gust response factor of 1 .6 is suggested to calculate the equivalent static wind loads of billboards on high-rise building roof.