脉动风荷载对公路防眩板结构抗风性能的影响

Wind Resistance Performance of Anti-Glare Panel Under Fluctuating Wind Loads

防眩板结构抗风性能的设计与检测目前以静力工况为主,忽视了风荷载脉动特性的影响.本文基于建筑结构的风振响应分析流程,发展了一种风荷载作用下安全设施结构的抗风性能计算方法.对高速公路用防眩板结构,建立了有限元模型,并结合风洞试验获取的脉动风荷载数据,进行了抗风计算,评估了脉动风对防眩板结构抗风性能的影响.结果表明,防眩板在脉动风作用下的响应量(如变形、应力等)较静风作用时会有所放大,若不考虑这种放大效应,则会高估防眩板的抗风性能,从而造成结构的损伤甚至断裂破坏.所得结论为指导该类设施的抗风设计提供了更为科学的依据.

The design and test of wind resistance performance of anti-glare panel are mainly carried out under static load conditions, and the influence of fluctuating wind loads is ignored. According to wind induced response analysis procedure on building structures, an approach to compute the wind resistance performance of traffic safety facilities was developed. The FE （Finite Element）model of an anti-glare panel was built, and the fluctuating wind load data was obtained from wind tunnel test, then the above approach was carried out on the anti-glare panel to estimate the influence of fluctuating wind load to its wind resistance performance. The results showed that the dynamic responses such as deformation and stress were amplified to a certain degree than those under static wind loads. If this amplification effect was neglected, the performance on wind resistance of the anti-glare panel would be over-estimated, which may result in structural damage or even fracture failure. The resuhs could provide scientific basis for wind resistant design of such traffic safety facility structures.