山区桁架梁悬索桥颤振稳定性气动优化研究

为研究山区峡谷大跨度钢桁梁悬索桥的颤振稳定性及其气动性能优化措施,以某大跨度钢桁架梁悬索桥为工程背景,通过有限元计算分析及主梁节段模型风洞试验,研究其主梁颤振稳定性能.针对大桥颤振临界风速低于颤振检验风速,设计并试验对比了封闭桥面板中央开槽、中央上稳定板和中央下稳定板三种气动优化方案.试验结果表明,采用格栅板封闭桥面板中央开槽并设置中央下稳定板能有效提高大桥的颤振稳定性.

Study on Flutter Stability Optimization of Truss Suspension Bridge in Mountainous Region

In order to investigate the flutter stability and performance optimization of long-span steel truss suspension bridges in mountainous region,a long-span suspension bridge was taken as an engineering example in this paper.The flutter performance of the bridge was analyzed by finite element analysis and wind tunnel test of sectional model which shows that the flutter critical wind speeds were less than the flutter checking wind speed.The aerodynamic optimizers,sealing the central slot and central stabilizers,were designed and tested.The test results show that sealing the central slot with grating plate and installing central stabilizer inside the truss simultaneously can enhance the bridge＇s flutter performance obviously.