考虑风偏角影响的大跨径拱桥横向风荷载试验

摘要

依据某大跨径拱桥全桥气弹模型风洞试验,研究了不同风偏角下结构的横向风荷载响应。试验对模型的动力特性和静力刚度进行了测定,并采用紊流场模拟桥址处的风环境,进行了0°～90°风偏角下不同风速的试验。试验验证了该拱桥的气动安全性。数据分析结果表明：当风向为正横桥向时,桥梁结构的风作用处于最不利状态,结构关键位置随风偏角的增大而增大;斜风向下桥梁实际风荷载效应比采用三角函数分解方法叠加得到结构风荷载效应更为不利。%Based on the wind tunnel tests on the aero elastic model of a long-span arch bridge,this paper researched the effect of structure under transversal wind loads on different skew angles.The dynamic characteristics and static rigidity of model were tested,and the structure was tested under transversal wind loads on different skew angles.The analysis shows that the bridge will come to the role of the most adverse condition when the wind direction is cross-bridge.And the corresponding key position in the bridge enlarged with the increased angle of skew wind.Furthermore,the skew wind load cannot be decomposed by trigonometric function and superposed to obtain the structure wind load effect,because the actual effect will be more negative.2 tabs,10 figs,13 refs.