列车作用下悬索桥刚度参数对桥梁动力性能影响

Influence research of dynamic responses of multi-tower suspension bridge under different stiffness parameters

分析研究了某多塔悬索桥不同的桁宽、桁高、主缆刚度和中塔刚度等刚度敏感参数对桥梁自振特性以及桥梁动力响应的变化规律,分析表明,加劲梁桁宽的增加能显著增大桥梁横向基频,且能减小跨中横向振动响应;加劲梁桁高、主塔刚度以及主缆刚度的增加均能提高结构整体竖向刚度,显著减小桥梁跨中竖向振动位移。

A detailed research on the effects of stiffness parameters such as beam width, girder height, stiffness of main cable and pylon tower are made under multiple loading conditions. The discipline of the calculation results was summarized. The results show that increase of the width of girder can significantly increase lateral vibration frequency and reduce the transverse vibration response of the bridge. The increase of the height of girder, the stiffness of the middle tower and the stiffness of the main cable can significantly increase the vertical stiffness of the bridge and re- duce the vertical vibration response of the bridge, which is beneficial to train running.