Critical distance-based probabilistic fatigue analysis of base-material notches in steel bridges considering size effect

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2024-11-14 DOI:10.1016/j.conbuildmat.2024.139130

Chuanxi Li , Bohai Ji , Yue Yao

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引用次数: 0

Abstract

Notch fatigue significantly challenges the structural integrity of notched components in engineering. This study improved traditional theory of critical distance (TCD) by refining its effective stress formula and critical distance model, while also incorporating Weibull distribution to develop probabilistic fatigue assessment frameworks. Subsequently, the feasibility of these frameworks was validated using fatigue test data from typical notched specimens made of Al2024-T351 and En3B materials. Based on this validation, P-S-N curves for typical notched details in steel bridges were estimated. The results show that the predicted P-S-N curves closely align with fatigue test data and have lower prediction errors than traditional TCD, which verifies the effectiveness of the proposed frameworks in evaluating typical notched details in steel bridges. Additionally, these P-S-N curves offer a potential for assessing the probabilistic fatigue life of similar notched details in steel bridges.

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基于临界距离的钢桥基底材料缺口概率疲劳分析（考虑尺寸效应

缺口疲劳极大地挑战了工程中缺口部件的结构完整性。本研究改进了传统的临界距离理论（TCD），完善了其有效应力公式和临界距离模型，同时结合威布尔分布开发了概率疲劳评估框架。随后，使用由 Al2024-T351 和 En3B 材料制成的典型缺口试样的疲劳测试数据验证了这些框架的可行性。在此基础上，对钢桥典型缺口细节的 P-S-N 曲线进行了估算。结果表明，预测的 P-S-N 曲线与疲劳测试数据密切吻合，预测误差低于传统的 TCD，这验证了所提出的框架在评估钢桥典型缺口细节方面的有效性。此外，这些 P-S-N 曲线还可用于评估钢桥中类似缺口细节的概率疲劳寿命。

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来源期刊

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.