高墩大跨连续刚构桥梁动力冲击系数研究

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振动与冲击 ›› 2025, Vol. 44 ›› Issue (7) : 209-216.

冲击与爆炸

高墩大跨连续刚构桥梁动力冲击系数研究

韦倩1,覃亮2,王宁波1,户东阳*3

作者信息 +

Dynamic impact coefficient of high pier large-span continuous rigid frame bridge

WEI Qian1, QIN Liang2, WANG Ningbo1, HU Dongyang*3

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文章历史 +

摘要

移动荷载作用下动力冲击问题与桥梁设计、运营维护密切关联，涉及桥梁结构建造经济性与服役安全性。当前的众多研究主要聚焦车辆过桥的动力放大，而单个车辆过桥行为的动力放大系数往往并不等同于桥梁设计阶段采用的动载系数。论文基于车-桥-墩耦合系统模型动力响应数值仿真计算，给出桥梁动力冲击系数(Bridge Impact Factor, BIF)的定义和计算方法。针对某高墩大跨梁桥，开展BIF计算和影响因素研究，分析限行速度、路面平整度等对BIF的影响。结果表明：BIF是与桥梁状态相关的固有特征参数，和桥梁的容许荷载、限行速度、路面平顺性等因素密切相关；BIF随着限行速度增大而增大，但当限行速度超过最不利速度后，BIF则保持不变；路面不平度对BIF有更显著的影响，随着路面不平度的增加，BIF进一步放大；当桥面发生恶化时，可以实施桥面铺装修复或限速限载来确保BIF在允许范围内。该研究揭示了桥梁BIF取值及衍化规律，可为同类型桥梁设计及运维管理提供指导与参考。

Abstract

The dynamic impact problem under moving load is closely related to bridge design, operation and maintenance, and involves the economy and service safety of bridge structure construction. At present, many studies mainly focus on the dynamic amplification of vehicle crossing the bridge, and the dynamic amplification coefficient of a single vehicle crossing the bridge is often not equal to the dynamic load coefficient used in the design stage of the bridge. Based on the numerical simulation of the dynamic response of the vehicle-bridge-pier coupling system model, the definition and calculation method of the bridge impact factor (BIF) were given. Aiming at a high-pier and long-span girder bridge, the BIF calculation and influencing factors were studied, and the influence of speed limit and pavement roughness on BIF was analyzed. The results show that BIF is an inherent characteristic parameter related to the bridge state, which is closely related to the allowable load, limited speed and pavement smoothness of the bridge. BIF increases with the increase of the speed limit, but when the speed limit exceeds the most unfavorable speed, BIF remains unchanged. Road roughness has a more significant effect on BIF, and BIF is further amplified with the increase of road roughness. When the bridge deck deteriorates, bridge deck pavement repair or speed limit can be implemented to ensure that the BIF is within the allowable range. This study reveals the value and evolution law of bridge BIF, which can provide guidance and reference for the design and operation and maintenance management of the same type of bridge.

导出引用

韦倩1, 覃亮2, 王宁波1, 户东阳3. 高墩大跨连续刚构桥梁动力冲击系数研究[J]. 振动与冲击, 2025, 44(7): 209-216

WEI Qian1, QIN Liang2, WANG Ningbo1, HU Dongyang3. Dynamic impact coefficient of high pier large-span continuous rigid frame bridge[J]. Journal of Vibration and Shock, 2025, 44(7): 209-216

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