Fatigue Stress Spectra and Reliability Evaluation of Short- to Medium-Span Bridges under Stochastic and Dynamic Traffic Loads

4 This study presents a novel approach to simulating the fatigue stress spectra of shortto 5 medium-span bridges under stochastic and dynamic traffic loads. The stochastic traffic load is 6 simulated based on the weigh-in-motion (WIM) measurements of a heavy-duty highway bridge 7 in China, and the dynamic effects are modeled using a vehicle-bridge coupled vibration system. 8 An interpolation response surface method (RSM) is used to approximate the effective stress 9 ranges of a bridge with respect to road roughness conditions, gross vehicle weights, vehicle 10 configurations, and driving speeds. The RSM provides a platform for an efficient spectrum 11 simulation of bridges under stochastic and dynamic traffic loads. A case study of a simply 12 supported T-girder bridge demonstrates the effectiveness and efficiency of the proposed 13 approach. The proposed computational framework provides an effective approach for 14 simulating the fatigue stress spectra for short-to medium-span bridges with WIM data. 15 1 Professor, School of Civil Engineering and Architecture, Changsha Univ. of Science and Technology, Changsha Hunan 410114, China. Email: yandonghuang@126.com 2 Research assistant, School of Civil Engineering and Architecture, Changsha Univ. of Science and Technology, Changsha Hunan 410114, China. Email: luoyuanbridge@163.com 3 Lecturer, School of Civil Engineering and Architecture, Changsha Univ. of Science and Technology, Changsha Hunan 410114, China. Email: lunaiweide@163.com 4 Assistant Prof., School of Civil Engineering and Architecture, Changsha Univ. of Science and Technology, Changsha Hunan 410114, China. Email: yuanming_dt@163.com 5 Professor, Institute for Risk and Relide@ability, Leibniz Universität Hannover, Hannover 31509, Germany. Email: beer@irz.uni-hannover.de Manuscript Click here to download Manuscript Manuscript.docx

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