板-桁组合式钢桁梁悬索桥颤振稳定性选型研究

Flutter stability selection study of a long-span steel truss suspension bridge with a combined deck plate

板-桁组合式钢桁梁与传统的板-桁分离式钢桁梁的气动性能存在较大差异。以某大跨度板-桁组合式钢桁梁悬索桥为工程背景,通过节段模型风洞试验,详细研究了该桥的气动性能。针对关乎结构抗风安全的颤振问题,比较了下中央稳定板、上中央稳定板和水平稳定板对主梁颤振性能的影响。在综合考虑结构安全、经济和美观等因素的基础上,提出了最优的主梁气动方案。研究成果可为类似大跨度钢桁梁桥的抗风设计提供借鉴和参考。

Comparing with the traditional beam-plate separation system,the aerodynamic per-formance of the steel truss with a combined deck plate is significantly different.By taking a sus-pension bridge with a combined deck plate as the engineering background,the aerodynamic per-formance of the bridge and aerodynamic optimizations of the deck configuration are studied in de-tail using the section model testing technique.To improve the flutter stability of the bridge,a se-ries of wind tunnel tests are conducted to investigate the effects of the upper central stabilized plate,the lower central stabilized plate and the horizontal stabilized plate on the flutter perform-ance of the main girder.According to the test results,the optimal aerodynamic measure is pro-posed to meet the requirements of the bridge wind resistance with consideration of structural safety,economy and aesthetic.The result can be taken as a reference for the design of aerody-namic performance of similar steel truss girder suspension bridges.