杭州湾南航道独塔斜拉桥抗风性能试验研究

杭州湾大桥为目前世界最长的跨海公路大桥,主桥包括南航道和北航道两座大跨度桥梁,抗风稳定性是控制主桥设计和施工的主要因素。采用单梁法力学计算模型对杭州湾南航道独塔斜拉桥成桥状态及施工状态进行动力特性分析,并通过节段模型风洞试验方法进行了测振试验和静三分力试验,即可测定颤振临界风速、气动导数、涡激振动响应、抖振响应和静力三分力系数,据此分析评估该桥的抗风性能。风洞试验结果表明:该桥具有较好的抗风稳定性。

EXPERIMENTAL INVERSTIGATION ON WIND-RESISTENT BEHAVIOR OF THE SINGLE-TOWER CABLE-STAYED BRIDGE OVER SOUTH CHANNEL OF HANGZHOU GULF

The long span bridge over Hangzhou Gulf is the longest across-sea bridge in the world. It mainly consists of the south-channel and the north-channel sections. Aerodynamic stability is one of the most important factors considered in the design and construction of the bridge. The dynamic analyses of the south-channel single-tower cable-stayed bridge during construction and service are conducted by adopting a single beam mechanical model. Vibration and aerostatic coefficient tests were also conducted using wind tunnel with section models. The critical flutter wind speed, flutter derivatives, vortex-induced vibration, buffeting response and aerostatic coefficients were measured, and wind-resistant property of the bridge is assessed based on the experimental results. The results show that the bridge has good aerodynamic stability.