台风致窗户破坏时大跨度屋面风振响应研究

WIND-INDUCED DYNAMIC RESPONSE OF LONG-SPAN ROOF STRUCTURES IN THE CASE OF SUDDEN OPENING

通过大跨度屋盖建筑刚性模型风洞试验和气动弹性模型风洞试验,得到屋面节点风压时程和加速度时程。采用试验所得的脉动风压时程数据利用有限元法对屋面进行风振瞬态响应分析得到了屋面位移和加速度响应,并与气动弹性模型风洞试验结果相比较,验证瞬态分析的正确性。详细阐述了台风致窗户破坏时大跨度屋盖结构的风振响应机理和特点,计算并比较了四周封闭和突然开孔两种情况的荷载风振系数和位移风振系数。这些结论为大跨度屋盖结构的抗风设计提供了指导和参考。

Rigid and aeroelastic model wind tunnel tests for a long-span roof structure in the case of round close and sudden opening were carried out. The time histories of wind pressure and acceleration of the roof structure model were measured. The time history records of wind pressure on the roof surface from the rigid model tests were treated as dynamic loads acting on the roof structure, and the wind-induced transient dynamic responses of long-span roof structure were predicted using finite element method. The results obtained from the finite element method agree well with the aeroelastic model wind tunnel test results. This paper also explains in detail the mechanism of wind-induced dynamic response and transient response characteristics of long-span roof structure in the case of sudden opening. The gust load factor and gust displacement factor in the case of round close and sudden opening are calculated and compared, respectively. Some valuable guidelines and recommendations for wind resistance design of long span-roof structure are proposed.