基于风洞试验的大跨度悬索桥涡振性能研究及评价

目前研究大跨度桥梁涡振性能的主要手段是节段模型风洞试验,而如何利用试验结果对桥梁进行全面细致的评价也需予以关注。以某大跨度悬索桥为工程背景,在阻塞度较小的XNJD-3大型风洞中进行1∶20大比例尺节段模型涡激振动试验,分析了阻尼、风迎角等因素对涡振响应的影响。最后考虑高阶振型的影响,将振幅换算到高阶模态,引入《公路桥梁抗风设计规范》以及英国BS5400规范对桥梁的涡激振动性能进行评价,为今后利用节段模型试验结果来评价实桥的涡振性能提供了借鉴。

Analysis and evaluation of vortex induced vibration performance for long span suspension bridge based on wind tunnel testing

Section model testing is the main technique to investigate vortex induced vibration （VIV） performance of long-span bridges, and how to evaluate the performance of bridge compre- hensively should be paid special attention. A long span suspension bridge is regarded as an engineering example in this paper. Alarge scale （1.20） section model wind tunnel testing was carried out in XNJD-3 with small blocking ratio. The effects of damping ratio and wind attack angle to vortex induced vibration response are discussed in detail. The amplification is converted to high order modes of the bridge, the Wind-resistant Design Specification for Highway Bridge and British Standard 5400 are applied here to evaluate vortex induced vibration performance of bridge. The experience provided here can be used for reference to evaluate vortex induced vibration performance of prototype by section model.