Fatigue evaluation of steel-concrete composite deck in steel truss bridge——A case study

Abstract

An innovative composite deck system has recently been proposed for improved structural performance. To study the fatigue behavior of a steel-concrete composite bridge deck, we took a newly-constructed rail-cum-road steel truss bridge as a case study. The transverse stress history of the bridge deck near the main truss under the action of a standard fatigue vehicle was calculated using finite element analysis. Due to the fact that fatigue provision remains unavailable in the governing code of highway concrete bridges in China, a preliminary fatigue evaluation was conducted according to the fib Model Code. The results indicate that flexural failure of the bridge deck in the transverse negative bending moment region is the controlling fatigue failure mode. The fatigue life associated with the fatigue fracture of steel reinforcement is 56 years. However, while the top surface of the bridge deck concrete near the truss cracks after just six years, the bridge deck performs with fatigue cracks during most of its design service life. Although fatigue capacity is acceptable under design situations, overloading or understrength may increase its risk of failure. The method presented in this work can be applied to similar bridges for preliminary fatigue assessment.

Graphical abstract

Keywords

Fatigue assessment / composite bridge deck / rail-cum-road bridge / fatigue stress analysis / Model Code

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Acknowledgements

This research was funded by the National Natural Science Foundation of China (Grant No. 51008006), and the China Railway No. 18 Engineering Group (No. 40004015201911). We would also like to thank our colleagues Dewang Li and Zhenyu Sun for their contribution in conducting the experimental work.

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