桥梁耐候钢Q370qENH抗疲劳性能研究  

Research on the Fatigue Performance of Bridge Weathering Steel Q370qENH

作　　者：李克璋 周强[1] 刘晖[1,2] 周博洋 刘国雄[4] LI Ke-zhang;ZHOU Qiang;LIU Hui;ZHOU Bo-yang;LIU Guo-xiong(School of Civil Engineering and Architecture,Wuhan University of Technology,Wuhan 430070,China;Sanya Science and Education Innovation Park,Wuhan University of Technology,Sanya 572025,China;School of Mechanical and Electronic Engineering,Wuhan University of Technology,Wuhan 430070,China;China Railway 11th Bureau Group Corporation Limited,Wuhan 430064,China)

机构地区：[1]武汉理工大学土木工程与建筑学院,武汉430070 [2]武汉理工大学海南三亚科教创新园,三亚572025 [3]武汉理工大学机电工程学院,武汉430070 [4]中铁十一局集团有限公司,武汉430064

出　　处：《武汉理工大学学报》2024年第12期55-61,共7页Journal of Wuhan University of Technology

基　　金：湖北省自主创新类项目重点研发专项(2023BCB047);海南省自然科学基金(522RC879);中国铁建股份有限公司B类课题(2023-B01)。

摘　　要：基于宝武钢铁集团生产的Q370qENH高性能桥梁耐候钢,对其开展了单调拉伸试验与高周疲劳试验,得到了它的力学性能与疲劳性能。采用考虑延性损伤的弹塑性模型对单调拉伸试验的应力-应变曲线进行拟合,并识别了力学模型的参数。采用Papadopoulos模型、Wang模型、WMCM模型以及基于von Mises应力的修正MWCM模型等4种基于临界面多轴高周疲劳准则的多轴疲劳寿命预测模型对耐候钢疲劳寿命进行预测。结果表明:不同疲劳寿命预测模型对非比例加载路径下的疲劳寿命预测效果参差不齐,除MWCM模型外,其他模型对90°圆形拉扭非比例路径的疲劳寿命预测准度非常低。因此建议对耐候钢的疲劳性能研究时采用MWCM模型。Based on Q370qENH high-performance bridge weathering steel produced by Baowu Iron and Steel Group, monotonic tensile tests and high cycle fatigue tests were conducted to obtain its mechanical and fatigue properties.The stress-strain curve of the monotonic tensile test was fitted using an elastic-plastic model considering ductile damage, and the parameters of the mechanical model were identified.Four multiaxis high fatigue life prediction criteria based on critical surface theory, that is, Papadopoulos model, Wang model, WMCM model, and modified MWCM model based on von Mises stress were used to predict the fatigue life of weathering steel.The results show that different fatigue life prediction models have uneven performance in predicting the fatigue life under non proportional loading paths.Except for the MWCM model, the accuracy of other models in predicting the fatigue life of 90° circular tension torsion non proportional paths is very low.Therefore, it is recommended to use the MWCM model for the fatigue performance investigation of weathering steel.

关 键 词：耐候钢 高周疲劳 延性损伤 非比例加载路径 寿命预测 

分 类 号：TU318[建筑科学—结构工程]