大跨度悬索桥施工状态风洞试验研究

重庆轨道交通专用桥为双塔自锚式悬索桥,其主跨跨度大且高度深,由于采用“先斜拉,后悬索”的施工工艺,因而施工吊装等阶段受风荷载影响较大。通过开展大桥风洞试验,对全桥在最不利施工状态下加劲梁的风致静动力响应如均匀流场及紊流场中的风速范围、振动幅度和临界风速进行分析。结果表明,最不利施工状态下加劲梁的抗风性能满足规范要求。

Study on Construction State of Long-span Suspension Bridge by Wind Tunnel Test

An urban railway bridge in Chonqing,which is a self-anchored suspension bridge with double tower,long-span,is far from the water surface.Therefore,the stiffening girder is sensitive to wind load in building process.The wind tunnel tests were carried out to analyze the static and dynamic responses including wind speed range,vibration amplitude and critical wind speed in the uniform f low f ield and the turbulent f low f ield of stiffening girder induced by wind load under the most unfavorable construction condition. The results showed that the performances of stiffening girder under wind load satisfy with the requirements of the specif ication .