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Shock and Vibration
Volume 2015, Article ID 659092, 13 pages
http://dx.doi.org/10.1155/2015/659092
Research Article

Fatigue Performance Assessment of Composite Arch Bridge Suspenders Based on Actual Vehicle Loads

1College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China
2Hangzhou Municipal Facilities Supervision and Administration Center, Hangzhou 310003, China
3College of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou 310003, China

Received 30 September 2014; Accepted 16 December 2014

Academic Editor: Alicia Gonzalez-Buelga

Copyright © 2015 Bin Chen et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

In the through arch bridges, the suspenders are the key components connecting the arch rib and the bridge deck in the middle, and their safety is an increasing focus in the field of bridge engineering. In this study, various vehicle traffic flow parameters are investigated based on the actual vehicle data acquired from the long-term structural health monitoring system of a composite arch bridge. The representative vehicle types and the probability density functions of several parameters are determined, including the gross vehicle weight, axle weight, time headway, and speed. A finite element model of the bridge structure is constructed to determine the influence line of the cable force for various suspenders. A simulated vehicle flow, generated using the Monte Carlo method, is applied on the influence lines of the target suspender to determine the stress process, and then the stress amplitude spectrum is obtained based on the statistical analysis of the stress process using the rainflow counting method. The fatigue performance levels of various suspenders are analyzed according to the Palmgren-Miner linear cumulative damage theory, which helps to manage the safety of the suspenders.