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Open Access

ARTICLE

A Study on the Fatigue Failure Characteristics of Steel Bridge Deck Pavement Layers under Dynamic Loads

Jiyi Li1, Zongqi Xiong2, Xinxin Cao3,*
1 Chongqing Highway Maintenance Engineering (Group) Co., Ltd., Chongqing, China
2 JSTI Chongqing Inspection, Testing and Certification Co., Ltd., Chongqing, China
3 Department of Road and Urban Railway Engineering, Beijing University of Technology, Beijing, China
* Corresponding Author: Xinxin Cao. Email: email
(This article belongs to the Special Issue: Durability Assessment of Engineering Structures and Advanced Construction Technologies)

Structural Durability & Health Monitoring https://doi.org/10.32604/sdhm.2026.083367

Received 02 April 2026; Accepted 20 May 2026; Published online 08 June 2026

Abstract

In response to the common interlaminar shear and delamination defects in the pavement of long-span steel bridges, this paper investigates the interface fatigue failure mechanism of the “SMA-13 + epoxy resin + orthotropic steel plate” system. Static direct shear tests indicate that the optimal application rate of epoxy resin is 1.5 kg/m2, and that elevated temperatures cause the failure mode to transition from brittle fracture to ductile creep. Based on full-factorial dynamic shear fatigue tests, this study discarded subjective empirical thresholds and innovatively proposed the “geometric tangent method” to quantitatively define fatigue life. Analysis of variance (ANOVA) revealed that the sensitivity of each factor to fatigue life, in descending order, is: temperature > loading frequency > stress level. Consequently, this study developed a high-precision, multifactorial life prediction model (R2 = 0.962), providing a scientific basis for evaluating the long-term service performance of bridge decks. Further validation using experimental data is required.

Keywords

Steel bridge deck surfacing; interfacial shear fatigue; epoxy resin; damage progression; service life prediction model

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