含裂纹损伤试验构件力学试验分析及材料性能研究  

Mechanical test analysis and material properties research of test members with crack damage

作　　者：昌毅[1,2] 余柳明 阳程 邹杨洋 高金贺[2] CHANG Yi;YU Liuming;YANG Cheng;ZOU Yangyang;GAO Jinhe(Engineering Research Center of Nuclear Technology Application(East China University of Technology),Ministry of Education,Nanchang 330013,China;School of Civil&Architecture Engineering,East China University of Technology,Nanchang 330013,China;MCC(Shanghai)Steel Structure Technology Co.,Ltd.,Shanghai 201908,China)

机构地区：[1]东华理工大学核技术应用教育部工程研究中心,南昌330013 [2]东华理工大学土木与建筑工程学院,南昌330013 [3]中冶(上海)钢结构科技有限公司,上海201908

出　　处：《建筑结构》2024年第8期91-96,共6页Building Structure

基　　金：江西省教育厅科学技术研究项目(GJJ180373);国家自然科学基金项目(51568001);核技术应用教育部工程研究中心开放基金(HJSJYB2015-10)。

摘　　要：以裂纹长度相对于构件宽度的比例作为构件的相对裂纹长度,研究了相对裂纹长度对含裂纹损伤试验构件的剩余极限强度、断后伸长率和力学性能的影响。研究结果表明:随着相对裂纹长度的增大,含裂纹损伤试验构件的剩余极限强度呈现近似线性减小的规律,并且含裂纹损伤试验构件剩余极限强度的有限元分析结果可以近似当作材料的屈服强度;当相对裂纹长度较小时,含裂纹损伤试验构件呈现塑性性能,试验构件在荷载作用下发生塑性破坏;当相对裂纹长度较大时,含裂纹损伤试验构件将由塑性性能朝脆性性能快速转变,试验构件在荷载作用下不一定发生塑性破坏;当相对裂纹长度大到一定程度时,含裂纹损伤试验构件呈现脆性性能,试验构件在荷载作用下发生脆性破坏。Taking the ratio of crack length to component width as the relative crack length of the component,the effects of relative crack length on the residual ultimate strength,elongation after fracture and mechanical properties of test members with crack damage were studied.The results show that with the increase of relative crack length,the residual ultimate strength of test members with crack damage decreases approximately linearly,and the finite element analysis results of the residual ultimate strength of test members with crack damage can be approximately regarded as the yield strength of the material.When the relative crack length is small,the steel member with crack damage exhibits plastic performance,and the steel member undergoes plastic failure under load.When the relative crack length is large,the steel member with crack damage will change from plastic performance to brittle performance rapidly,and the plastic failure of steel member may not occur under load.When the relative crack length is large to a certain extent,the test members with crack damage exhibit brittle properties,and the test members undergo brittle failure under load.

关 键 词：钢构件 裂纹损伤 剩余极限强度 力学性能 相对裂纹长度 

分 类 号：TU398.7[建筑科学—结构工程]