Abstract
Fatigue cracking is one of the main diseases of steel bridges in operation stage. Scientific evaluation is of great significance to improve structural durability. However, obtaining the hot-spot stress (σHSS) extrapolation point is challenging due to limited space around certain structural details in steel bridges. To overcome this limitation, a HSS prediction method incorporating the stress concentration factor (SCF) was proposed. Additionally, a structural mechanics model based on the mechanical characteristics of the web gap in the main girder of a steel truss bridge was established to calculate its nominal stress. Experimental and numerical simulations have been conducted to investigate the effects of various geometric parameters of the web gap on the SCFs. On this basis, a formula for predicting the SCF in web-gap weld was developed using multiple linear stepwise regression analysis. A fatigue evaluation framework considering the SCF for the web-gap weld were proposed. The result shows the web gap is affected by the joint actions of rotation and displacement, with the web gap of the end floor beam being more prone to fatigue damage. Moreover, the structural mechanics model considering the joint actions of rotation and displacement aligns better with the actual stress characteristics. The proposed SCF prediction formula for the web-gap weld demonstrates an error of less than 5% compared to the FE results. The fatigue damage obtained by the proposed HSS prediction method is consistent with the traditional extrapolation method, hence validating the feasibility and reliability of the proposed approach.
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The research reported herein has been conducted as part of the research projects granted by the National Key Research and Development Project (No. 2017YFE0128700). The assistances are gratefully acknowledged.
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Li, C., Ji, B., Fu, Z. et al. Stress Concentration Factor-Based Hot-Spot Stress Prediction Model for the Web-Gap Weld of Main Girder in Steel Truss Bridge. KSCE J Civ Eng 28, 262–274 (2024). https://doi.org/10.1007/s12205-023-0331-6
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DOI: https://doi.org/10.1007/s12205-023-0331-6