台风对大跨度钢桁拱桥抗风性能的影响

Effect of Strong Typhoon on Windinduced Performance of LongSpan Steel Truss Arched Bridge

摘要:

采用MonteCarlo台风随机模拟算法的结果和风荷载规范良态气象风环境参数建议取值，在大气边界层风洞中利用被动紊流发生装置再现了良态和台风2类气象条件下的风环境特征.以地处珠江流域台风多发区的广州新光大桥为例，采用全桥气弹模型风洞试验和基于主梁及肋拱测力试验的3维静风稳定性数值计算等手段，详细分析了中承式大跨度连续刚桁拱桥在2类风环境中平均风位移、风致抖振响应和3维稳定性的差异，分析过程比较了2类气象条件下重现期设计风速、平均风和紊流度剖面等因素对于拱桥抗风性能的影响.

Abstract:

Based on the MonteCarlo typhoon simulation results of typhoon field characteristics and the wind parameters of normal climate field from wind loading Codes, both the typhoon and the normal climate field are simulated in the atmospheric boundary layer wind tunnel by the passive turbulence generators. Taken as an example, wind resistant performance of Guangzhou Xinguang Bridge,a longspan arched bridge located in the south Mainland China, is compared under the above two climate modes based on the full aeroelastic model wind tunnel testing and the threedimensional numerical algorithm of static wind displacement and its stability with the help of static aerodynamic force coefficients of sectional model of the main girder and the arc rib in midspan. In the process of analysis, more emphases are focused on the effects of design wind speeds of return period, vertical profiles about average wind velocity and turbulence intensity on arc bridge windresistant performance.