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为研究大跨高墩连续刚构桥在最大双悬臂状态下的抗风性能,以黄河壶口大桥为工程背景,应用有限元数值分析方法,分析了结构的动力特性;并设计、制作气弹模型,对其进行风洞试验研究,考虑了风场类型、风偏角和阻尼比等参数的影响。结果表明:在自然风场条件下,结构最大双悬臂施工状态时,发生涡激共振和驰振的可能性很小;紊流场对应的结构振幅明显大于均匀流场的结构振幅;90°风偏角对应的3个方向振幅均最大;上游桥对下游桥有一定的遮挡效应;增大结构阻尼比能够明显地抑制结构的风致振动振幅。
In order to study the wind resistance of the continuous rigid frame bridge with large span and high piers under the maximum double cantilever condition, the dynamic characteristics of the structure are analyzed by using the finite element numerical analysis method based on the Hukou Bridge in the Yellow River. The design and manufacture of aeroelastic Model, the wind tunnel test study, taking into account the wind field type, wind angle and damping ratio and other parameters. The results show that there is less possibility of vortex-induced resonance and galloping in the construction of double-cantilever structure under the condition of natural wind field. The amplitude of structure corresponding to the turbulent flow field is obviously larger than that of the uniform flow field. The 90 ° wind The amplitude of the three directions corresponding to the declination angle is the largest; the upstream bridge has a certain shielding effect on the downstream bridge; increasing the structural damping ratio can obviously suppress the wind-induced vibration amplitude of the structure.