Abstract
Continuous girder bridges become increasingly popular because of the rapid development of highway throughout the world. Most of previous researches on vibration analysis of a multispan continuous bridge subject to complex traffic loading and vehicle dynamic interaction focus on the girder displacement not considering braking effects. In current literature, few studies have discussed the effects of braking on continuous girder bridges. In this study, we employ the finite element method (FEM) to investigate the dynamic response of continuous girder bridge due to three-axle vehicle. Vertical reaction forces of axles that change with time make bending vibration of girder increase significantly. The braking in the first span is able to create response in other spans. In addition, the dynamic impact factors are investigated by both FEM and experiments on a real bridge structure. The results of this study extend the current understanding of the bridge dynamic behaviors and can be used as additional references for bridge codes by practicing engineers.
Highlights
Dynamic interactions between vehicle and bridge were initially interested in railway engineering; they rapidly attracted attention of highway engineering
Kishan and Trail-Nash [5] studied the dynamic response of highway bridges due to vehicle loading considering braking force, and the resulting impact factors (IMs) may be larger than those adopted in the current design code
This study introduces the results of research on dynamic interaction model between a three-axle vehicle and a continuous concrete girder bridge considering braking effects
Summary
Dynamic interactions between vehicle and bridge were initially interested in railway engineering; they rapidly attracted attention of highway engineering. Kishan and Trail-Nash [5] studied the dynamic response of highway bridges due to vehicle loading considering braking force, and the resulting impact factors (IMs) may be larger than those adopted in the current design code. Gupta and Trail-Nash [6] investigated the dynamic behavior of bridge model with single span uniform girder considering the road surface irregularities and vehicle braking force. Law and Zhu [10] studied the dynamic behavior of continuous three spans under moving vehicle considering the roughness of the road surface. Of most of the previous researches on dynamic interaction between the vehicle and supported bridge, very few studies have focused on the multispan continuous girder bridge considering braking effects. This study develops the FEM to analyze the interaction between three-axle dumper truck vehicle and seven-span continuous concrete girder bridge considering the braking force. Numerical analysis results were compared with the experimental testing results performed on the Hoa-Xuan bridge in Danang city, Vietnam
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