#br# 随机车辆荷载下大跨钢桥伸缩缝纵向位移响应及病害控制研究

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振动与冲击 ›› 2019, Vol. 38 ›› Issue (24) : 172-178.

论文

韩大章1，郭彤2，黄灵宇2，刘中祥2

作者信息 +

A study on longitudinal displacements and damage control of expansion joints of long-span steel bridges under stochastic traffic loads

HAN Dazhang1,GUO Tong2,HUANG Lingyu2,LIU Zhongxiang2

Author information +

文章历史 +

摘要

伸缩缝是桥梁结构中的易损部件之一，而大跨钢桥由于柔性大，对振动较为敏感，其伸缩缝病害更为突出。为控制大跨钢桥的伸缩缝病害，结合随机车辆荷载模型和有限元分析，建立了一种随机车流下伸缩缝位移响应的分析方法。研究了车速、车致振动频率、车流量和重型车对伸缩缝纵向位移的影响，发现当车速和振动频率较高、车流量较大、重型车比例较高时，伸缩缝的累计位移显著增大。基于上述研究，提出两类车流限速和增设梁端阻尼器的措施，以控制伸缩缝病害。分析结果表明：与分时段限速措施相比，分车型限速的效果更为明显；在梁端增设黏滞阻尼器后，伸缩缝位移幅值、累计位移和高频位移都有显著的降低。

Abstract

An expansion joint is one of the vulnerable bridge parts, and for long-span steel bridges, which are vibration sensitive due to high flexibility, their expansion joints encounter more significant damage.To control the damage of expansion joints of long-span steel bridges, an approach for analyzing the displacements of expansion joints under stochastic traffic flow was established, based on the stochastic vehicle model and finite element analysis.The influence of speed, vehicle-induced vibration frequency, traffic volume and heavy traffic on longitudinal displacements was investigated, and it is found that with higher vehicle speed and vibration frequency, larger traffic volume and more heavy vehicles, the cumulative displacements of expansion joints significantly increase.Two kinds of traffic limit measures and installing viscous dampers at beam ends are suggested, so as to control the damage of expansion joints.Analysis results show that the vehicle-type based measure is more effective than the time-based measure.After the use of viscous dampers at beam ends, there is a significant reduce in displacement amplitude, cumulative displacement and high-frequency displacements.

导出引用

韩大章1，郭彤2，黄灵宇2，刘中祥2. #br# 随机车辆荷载下大跨钢桥伸缩缝纵向位移响应及病害控制研究[J]. 振动与冲击, 2019, 38(24): 172-178

HAN Dazhang1,GUO Tong2,HUANG Lingyu2,LIU Zhongxiang2. A study on longitudinal displacements and damage control of expansion joints of long-span steel bridges under stochastic traffic loads[J]. Journal of Vibration and Shock, 2019, 38(24): 172-178

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