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Abstract

To investigate the influence of wheel load models on fatigue damage assessment of steel bridges, this paper adopted wheel load surface testing and finite element analysis to obtain the fatigue stress spectrum of typical fatigue details under traffic loads. Based on the cumulative fatigue damage theory, the differences in fatigue damage assessment caused by wheel load models were analyzed. The results show that the wheel load surface has an irregular shape, with the lateral contact size remaining constant and longitudinal contact size approximately linearly changing from zeroload to full load. The contact size under different loads can be determined by utilizing the linear interpolation method. Meanwhile, the evaluation results of the wheel load model in BS5400 and Japanese steel bridge specifications are higher than those of actual fatigue damage, while the evaluation results of the wheel load model in EURO-CODE and Chinese steel bridge specifications are lower than those of actual fatigue damage. The evaluation results of AASHTO specifications are closer to the actual fatigue damage, with the wheel load model exerting a significant influence on the fatigue damage assessment of steel bridges. In assessing the anti-fatigue design or fatigue damage of steel bridges, the influence of the actual wheel load model should be fully considered, and the actual wheel load model should be employed or the evaluation results based on the standard wheel load model should be corrected.

Publication Date

8-18-2022

DOI

10.14048/j.issn.1671-2579.2022.04.023

First Page

126

Last Page

131

Submission Date

May 2025

Reference

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