中国铁道科学2025，Vol.46Issue(2)：82-92,11.DOI:10.3969/j.issn.1001-4632.2025.02.08
预应力CFRP布置方式对加固含复合型边裂纹钢结构的疲劳性能影响
Research on the Effect of Prestressed CFRP Configurations on the Fatigue Performance of Strengthened Steel Structure with a Mixed-Mode Edge Crack
摘要
Abstract
In order to improve the strengthened efficiency of prestressed carbon fiber reinforced polymer(CFRP)for fatigue-cracked steel structures,the prestressed CFRP-reinforced tensile steel plate with a mixed-mode edge crack is taken as the research object to study the crack propagation behavior and fatigue life of the pre-split tensile steel plate reinforced by different prestressing configurations of CFRP,through the fatigue test and the finite element simulation of crack propagation.The results indicate that,compared to the CFRP reinforcement amount and the initial crack size,the prestressing configuration of CFRP has the most significant influence on the edge crack propagation behavior of steel plates with the mixed-mode crack.The crack driving force reduction rate for prestressed CFRP arranged along the nominal principal tensile stress direction is about one times higher compared to the layout perpendicular to the initial crack direction.The improvement in fatigue life is about three times higher,and with the increase in prestressing level,the advantage of reinforcement along the principal tensile stress direction becomes more pronounced.Under the conditions of CFRP reinforcement ratio of 0.18,and pre-compression of 30 MPa on steel plate,prestressing CFRP arranged along the nominal principal tensile stress direction can increase fatigue life by over hundreds times,achieving an reinforcement efficiency more than five times higher than that of non-prestressed CFRP.关键词
钢结构/加固/预应力CFRP/布置方式/复合型边裂纹/扩展行为/疲劳寿命Key words
Steel structure/Reinforcement/Prestressed CFRP/Configuration/Mixed-mode edge crack/Crack propagation behavior/Fatigue life分类
土木建筑引用本文复制引用
叶华文,张超凡,邓加林,何建希,邓雪峰..预应力CFRP布置方式对加固含复合型边裂纹钢结构的疲劳性能影响[J].中国铁道科学,2025,46(2):82-92,11.基金项目
国家重点研发计划项目(2023YFB2604400,2023YFB2604403) （2023YFB2604400,2023YFB2604403）
国家自然科学基金资助项目(52278219) （52278219）
中国中铁股份有限公司科技研究开发计划项目(2023-专项-02) （2023-专项-02）
