斜塔单索面曲线异形钢箱梁步道桥风振抑制

Wind Vibration Suppression of Leaning Tower Single Cable Plane Curved Heterotropic Steel Box Girder Trail Bridge

为了解决台风频发沿海城市建造大跨度柔性步行桥的风致共振稳定问题,以厦门山海健康步道最大跨度斜塔单索面曲线异形钢箱梁步道索桥(仙岳桥)为对象,建立了三维有限元模型进行理论分析,并制作了节段模型箱梁进行风洞试验,探索其成桥状态风致共振响应机理及抑制共振的构造措施。提出了设置60cm和80cm两种导流板抑振方案,模型试验结果表明60cm导流板的抑振措施优于80cm方案,在当地台风季检验风速范围内未见驰振显现,该构造措施同时满足涡振、颤振规范要求。

In order to solve the wind-induced resonance stability problem of long-span flexible pedestrian bridges built in coastal cities with frequent typhoons,a three-dimensional cable bridge(Xianyue Bridge)with a single-cable surface curve profiled steel box girder trail with the largest span of the leaning tower of the Xiamen Shanhai Healthy Trail was established.The finite element model was used for theoretical analysis,and a segment model box girder was made for wind tunnel tests to explore the wind-induced resonance response mechanism of the bridge and the structural measures to suppress the resonance.Two kinds of anti-vibration schemes of 60 cm and 80 cm are proposed.The model test results show that the anti-vibration measures of the 60 cm deflector are better than the 80 cm scheme.There is no galloping vibration within the inspection wind speed range of the local typhoon season.The structural modification measures meet the requirements.Specification requirements for vortex and flutter.