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research-article

Effect of Prestress on Bridge-Vehicle Interactions

[+] Author and Article Information
Hai Zhong

Department of Civil & Environmental Engineering, North Dakota State University, Fargo, ND 58108
hai.zhong@ndsu.edu

Mijia Yang

Assistant Professor, Department of Civil & Environmental Engineering, North Dakota State University, Fargo, ND 58108
mijia.yang@ndsu.edu

1Corresponding author.

ASME doi:10.1115/1.4038340 History: Received January 28, 2016; Revised October 28, 2017

Abstract

Prestress applied on bridges affects the dynamic interaction between bridges and vehicles traveling over them. In this paper, the prestressed bridge is modeled as a beam subjected to eccentric prestress force at the two ends, and a half-vehicle model with 4 degrees of freedom is used to represent the vehicle passing the bridge. A new bridge-vehicle interaction model considering the effect of prestress with eccentricity is developed through the principle of virtual work. The correctness and accuracy of the model are validated with literature results. Based on the developed model, numerical simulations have been conducted using the Newmark's ß method to study the effects of vehicle speed, eccentricity and amplitude of the prestress, and presence of multiple vehicles. It is shown that prestress has an important effect on the maximum vertical acceleration of vehicles, which may provide a good index for detecting the change of prestress. It is also interesting to find that the later-entering vehicle on the prestressed bridge will largely reduce the maximum vertical acceleration of the vehicle ahead of it.

Copyright (c) 2017 by ASME
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