含不同角度等长双裂纹损伤钢构件的力学试验及剩余极限强度研究  

Study on mechanical test and residual ultimate strength of steel members with equal-length double cracks damage and different angles

作　　者：昌毅[1,2] 马东杰 李英豪 杨子健 李革新 CHANG Yi;MA Dong-jie;LI Ying-hao;YANG Zi-jian;LI Ge-xin(School of Civil&Architectural Engineering,East China University of Technology,Nanchang 330013,China;Department of Environmental Engineering and Architecture,Nagoya University,Nagoya 4648603,Japan;CCCC Third Harbor Engineering Bureau Hunan Branch Co.,Ltd.,Zhuzhou 412000,China)

机构地区：[1]东华理工大学土木与建筑工程学院,江西南昌330013 [2]名古屋大学环境和建筑学研究科,名古屋4648603 [3]中交第三航务工程局有限公司湖南分公司,湖南株洲412000

出　　处：《塑性工程学报》2025年第4期210-218,共9页Journal of Plasticity Engineering

基　　金：国家自然科学基金资助项目(52268020);中国国家留学基金项目(202308360115);中交第三航务工程局有限公司资助项目(2024-三峡锚建综-027)。

摘　　要：选取含不同角度等长双裂纹损伤Q355钢构件作为研究对象,对其开展单轴拉伸试验,得到了断后伸长率、屈服强度及剩余极限强度等力学性能指标。通过分析相对裂纹长度、相对裂纹间距及裂纹角度等几何参数,研究这些参数与不同角度等长双裂纹Q355钢构件的断后伸长率、屈服强度及剩余极限强度的关系。基于投影等效转换,进而分析这些几何参数对剩余极限强度的影响,在含单一裂纹损伤钢构件的剩余极限强度计算公式中引入了裂纹角度和相对裂纹间距,提出了改进型剩余极限强度计算公式。结果表明:改进型剩余极限强度计算公式的误差保持在3.4%以内,具有较高精度,可为钢结构的设计、维护、安全性评估及其塑性性能分析等提供可靠的理论依据。Taking Q355 steel members with equal-length double cracks damage and different angles as the research object,the uniaxial tensile tests were carried out.Mechanical property indexes such as elongation after fracture,yield strength and residual ultimate strength were obtained.By analyzing the geometric parameters such as relative crack length,relative crack spacing and crack angle,the relationship between these parameters and elongation after fracture,yield strength and residual ultimate strength of Q355 steel mumbers with equal-length double cracks and different angles was studied.Based on the projection equivalent conversion,the effects of geometric parameters affecting the residual ultimate strength were analyzed.The crack angle and relative crack spacing were introduced into the calculation formula of the residual ultimate strength of the steel members with single-crack damage,and the improved calculation formula of residual ultimate strength was proposed.The results show that the error of the improved residual ultimate strength calculation formula proposed is less than 3.4%,which has high accuracy and can provide a reliable theoretical basis for the design,maintenance,safety evaluation and plastic property analysis of steel structures.

关 键 词：塑性性能 双裂纹损伤 钢构件 剩余极限强度 投影等效转换 

分 类 号：TU312.3[建筑科学—结构工程]