基于刚性模型测压风洞试验数据,分析了双面式及三面式独立柱广告牌的风荷载特性,并采用时程分析法对其风振特性进行了研究。结果显示:双面式广告牌的合风力系数平均值和脉动值在0o~15o风向角下分别达到最大值1.46和0.17,而三面式广告牌则在0o风向角下达到最大值1.45和0.16;两者的扭矩系数平均值分别在52.5o、30o风向角达到最大值;双面式广告牌的节点位移响应共振能量由垂直于面板方向的弯曲振型提供,而三面式广告牌的节点位移响应共振能量由平行于面板组成三角形的中线和垂直于中线的弯曲振型提供;两者的钢管梁扭转角响应的共振能量都由扭转振型提供;双面式、三面式广告牌弯曲振动最不利工况为0o风向角,风振系数分别为1.51、1.59;扭转振动最不利工况分别为52.5o风向角、30o风向角,风振系数分别为1.63、2.65。
Abstract
Based on rigid model wind tunnel test, the wind load characteristics of double-side and three-side single column supported billboard are analyzed, and the wind-induced vibration characteristics are studied using time history analysis method. The results show that the mean and fluctuating total wind loading coefficient for double-side billboard gets maximum value of 1.46 and 0.17 under 0o ~ 15o wind direction, while that of three-side billboard gets maximum value of 1.45 and 0.16 under 0o wind direction; Their mean torsion coefficient get maximum value under 52.5o, 30o wind direction, respectively; The resonance energy of node displacement for double-side billboard is supported by the bending mode perpendicular to the panels, while that for three-side billboard is supported by the bending modes perpendicular to and parallel to the center line of the triangle composed by panels. The resonance energy of beam torsion angle for two billboards is both supported by the torsion mode; The most unfavorable condition for bending vibration of two billboards is 0o wind direction, and the wind vibration coefficient is 1.51, 1.59 respectively. While the most unfavorable condition for torsion vibration of two billboards is 52.5o, 30o wind direction, and the wind vibration coefficient is 1.63, 2.65 respectively.
关键词
独立柱广告牌 /
风洞试验 /
风荷载特性 /
风致响应
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Key words
single column supported billboards /
wind tunnel test /
wind load characteristic /
wind-induced response
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参考文献
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