桥头引道沉降对简支梁冲击效应的影响分析

张丽芳;艾军

振动与冲击 ›› 2009, Vol. 28 ›› Issue (10) : 4-7.

PDF(2028 KB)
PDF(2028 KB)
振动与冲击 ›› 2009, Vol. 28 ›› Issue (10) : 4-7.
论文

桥头引道沉降对简支梁冲击效应的影响分析

  • 张丽芳;艾军
作者信息 +

Impact Influence Analysis Of The Approach Differential Settlement To Single Supported Bridges

  • Zhang Lifang;Ai’jun
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文章历史 +

摘要

摘 要:针对旧桥中经常出现的桥头引道及伸缩缝破损情况,考虑接缝处沉降差引起的桥头跳车对桥梁振动的影响,提出与错台高度相关的桥头衔接状况五个等级划分标准。以我国常见的中小跨径简支梁为对象,基于五参数车辆模型的车桥耦合系统运动方程,用Newmark法进行数值求解,分析桥头引道沉降差对桥梁振动的影响。研究表明随着沉降差增加,汽车对桥梁的冲击效应明显变大,且随着车速的增大,冲击效应变大。沉降差在桥梁中产生的动力放大系数随着跨径增大而减小。另外,桥头沉降差使车辆竖向加速度瞬时变大,其绝对值随着错台高度的增加而迅速增大,该加速度变化与桥梁跨径无关。

Abstract

Abstract: The bridge approach and expansion joint are often damaged in old bridges. The paper focuses on considering the vibration of bridge affected by the vehicle bumping caused by differential settlement at the joint. The approach state is divided into five grades according to the settlement at the abutment. Based on the five parameters vehicle-bridge coupled model, the vibration equation is deduced and Newmark method is used to solve the equation. Taking the short span single supported beam bridges as object, the influence of approach fault on bridge vibration is analyzed. It is found that the settlement of abutment affects bridge vibration and with the settlement increases the impact of vehicle to bridge also increases explicitly. The dynamic amplification factor caused by the settlement is much bigger in short span than in long span. With the vehicle speed increases, the impact factor also increases and the influence region also expands. In addition, the settlement at the abutment causes the increase of vehicle accelerated velocity which is not affected by the span of bridge.

关键词

桥头跳车 / 车桥耦合 / 动力放大系数 / 沉降差 / 车速

Key words

Vehicle bump / vehicle-bridge coupled system / Dynamic amplification factor / Differential settlement / Vehicle speed

引用本文

导出引用
张丽芳;艾军. 桥头引道沉降对简支梁冲击效应的影响分析[J]. 振动与冲击, 2009, 28(10): 4-7
Zhang Lifang;Ai’jun. Impact Influence Analysis Of The Approach Differential Settlement To Single Supported Bridges[J]. Journal of Vibration and Shock, 2009, 28(10): 4-7

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