{"title":"Failure analysis on diaphragm components in long-span bridge under high-cycle fatigue coupled local corrosion","authors":"Cheng Xie , Yongtao Bai","doi":"10.1016/j.engfailanal.2025.110107","DOIUrl":null,"url":null,"abstract":"<div><div>Diaphragms are the critical components in long-span bridges, ensuring the structural stiffness and stability but prone to high-cycle fatigue (HCF) cracking. For the current gap in the failure analysis on diaphragm components under the coupling of HCF, corrosion and extreme loads, this paper conducted failure tests on diaphragm in long-span bridge under extreme conditions of HCF coupled corrosion. Firstly, variable and constant HCF loads were applied to two specimens, respectively. For the third one, local corrosion causing 15 % mass loss was imposed on the single-sided cutout of the diaphragm before constant HCF loading. For all above specimens with HCF damage, monotonic extreme loading was further applied until 15 % bending capacity loss. The results showed that with the local corrosion, fatigue cracks no longer occurred at the weld toe but the midpoint of the arc-shaped steel plate, not only accelerating the HCF damage but also decreasing the maximum bending capacity of the diaphragm component by 10 %, and leading to a 14.9 % reduction of residual bending capacity due to buckling compared with the uncorroded component. Additionally, this paper built a structural fatigue analysis model (SFAM) for diaphragm components to accurately simulate multi-stage damage evolution. Real-time crack lengths and structural stiffness degradation were obtained, within 10 % deviation from the test measurements. Fatigue resistance of each cracking detail with or without local corrosion was quantified based on model parameters of SFAM, providing a HCF analysis tool for the full-life evolution of diaphragm components in long-span bridges.</div></div>","PeriodicalId":11677,"journal":{"name":"Engineering Failure Analysis","volume":"182 ","pages":"Article 110107"},"PeriodicalIF":5.7000,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Engineering Failure Analysis","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1350630725008489","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, MECHANICAL","Score":null,"Total":0}
引用次数: 0
Abstract
Diaphragms are the critical components in long-span bridges, ensuring the structural stiffness and stability but prone to high-cycle fatigue (HCF) cracking. For the current gap in the failure analysis on diaphragm components under the coupling of HCF, corrosion and extreme loads, this paper conducted failure tests on diaphragm in long-span bridge under extreme conditions of HCF coupled corrosion. Firstly, variable and constant HCF loads were applied to two specimens, respectively. For the third one, local corrosion causing 15 % mass loss was imposed on the single-sided cutout of the diaphragm before constant HCF loading. For all above specimens with HCF damage, monotonic extreme loading was further applied until 15 % bending capacity loss. The results showed that with the local corrosion, fatigue cracks no longer occurred at the weld toe but the midpoint of the arc-shaped steel plate, not only accelerating the HCF damage but also decreasing the maximum bending capacity of the diaphragm component by 10 %, and leading to a 14.9 % reduction of residual bending capacity due to buckling compared with the uncorroded component. Additionally, this paper built a structural fatigue analysis model (SFAM) for diaphragm components to accurately simulate multi-stage damage evolution. Real-time crack lengths and structural stiffness degradation were obtained, within 10 % deviation from the test measurements. Fatigue resistance of each cracking detail with or without local corrosion was quantified based on model parameters of SFAM, providing a HCF analysis tool for the full-life evolution of diaphragm components in long-span bridges.
期刊介绍:
Engineering Failure Analysis publishes research papers describing the analysis of engineering failures and related studies.
Papers relating to the structure, properties and behaviour of engineering materials are encouraged, particularly those which also involve the detailed application of materials parameters to problems in engineering structures, components and design. In addition to the area of materials engineering, the interacting fields of mechanical, manufacturing, aeronautical, civil, chemical, corrosion and design engineering are considered relevant. Activity should be directed at analysing engineering failures and carrying out research to help reduce the incidences of failures and to extend the operating horizons of engineering materials.
Emphasis is placed on the mechanical properties of materials and their behaviour when influenced by structure, process and environment. Metallic, polymeric, ceramic and natural materials are all included and the application of these materials to real engineering situations should be emphasised. The use of a case-study based approach is also encouraged.
Engineering Failure Analysis provides essential reference material and critical feedback into the design process thereby contributing to the prevention of engineering failures in the future. All submissions will be subject to peer review from leading experts in the field.