移动车辆荷载作用下大跨径连续梁桥动力响应研究

发布时间：2018-04-19 00:34

本文选题：连续梁桥 + 大跨度桥梁　；参考：《桥梁建设》2015年02期

【摘要】：针对移动车辆荷载作用下公路桥梁动力性能设计与评价方法不足的问题,以依兰松花江公路大桥为例,运用自编程序,分析不同车辆荷载工况下桥梁冲击系数与振动加速度等动力响应指标的变化规律。结果表明,冲击系数随车辆纵向间距与车速的变化规律一致,均呈波动上升趋势;多车道时,若桥面不平整度沿横向变化不明显则冲击系数与车道数基本无关;大跨径桥梁不同部位的冲击系数有别,现行规范所采用单一断面的冲击系数计算全桥设计荷载方法的合理性值得商榷;在固定车距下,冲击系数随着加载效率的增大而呈下降趋势;振动加速度与冲击系数具有高度相关性。本文所得结论为移动车辆荷载作用下桥梁动力性能设计与评价提供了一定的依据。
[Abstract]:Aiming at the problem of insufficient design and evaluation method of dynamic performance of highway bridge under moving vehicle load, taking Yilan Songhua River Highway Bridge as an example, a self-compiled program is used.The variation law of dynamic response indexes such as bridge impact coefficient and vibration acceleration under different vehicle load conditions is analyzed.The results show that the impact coefficient is consistent with the change of the vehicle longitudinal distance and the speed of the vehicle, and the impact coefficient is almost independent of the number of carriageways if the bridge deck irregularity is not obvious in the case of multiple lanes.The impact coefficient of different parts of long-span bridge is different. The rationality of calculating the design load of the whole bridge by the impact coefficient of a single section used in the current code is debatable.The impact coefficient decreases with the increase of the loading efficiency, and the vibration acceleration has a high correlation with the impact coefficient.The conclusions in this paper provide a basis for the design and evaluation of bridge dynamic performance under moving vehicle loads.
【作者单位】：哈尔滨工业大学交通科学与工程学院;新加坡国立大学土木与环境工程系;浙江省交通规划设计研究院;
【基金】：国家自然科学基金项目(50678051,51108132) 国家留学基金项目(201306120185)~~
【分类号】：U441.3;U448.215

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