基于Weibull理论的再生混凝土疲劳性能研究  

Experimental Study on Compressive Fatigue Performance of Recycled Concrete under Temperature Cycling

作　　者：周金枝 张政 李竞钎 ZHOU Jinzhi;ZHANG Zheng;LI Jingqian(School of Civil Engin.,Architecture and Environment,Hubei Univ.of Tech.,Wuhan 430068,China;State Key Laboratory for Health and Safety of Bridge Structures,Wuhan 430034,China)

机构地区：[1]湖北工业大学土木建筑与环境学院,湖北武汉430068 [2]桥梁结构健康与安全国家重点实验室,湖北武汉430034

出　　处：《湖北工业大学学报》2023年第1期71-75,共5页Journal of Hubei University of Technology

基　　金：桥梁结构健康与安全国家重点实验室开放课题(BHSKL19-04-KF)。

摘　　要：采用MTS材料动态疲劳试验机对温度循环后的C、RC、SFRC、SICRC进行疲劳试验,研究在不同应力水平作用下(0.9、0.8、0.7)混凝土的疲劳变形特征和疲劳寿命。基于试验数据,对各试样疲劳寿命进行两参数Weibull分布检验,建立了p-S-N方程。结果表明:与RC、SFRC相比,SICRC在疲劳破坏时有更好的延展性和整体性,难以破碎毁坏;由同一应力水平下的S-N曲线可得出,SICRC疲劳寿命和疲劳强度均要优于RC、SFRC;利用两参数Weibull分布理论检验各试样疲劳寿命,其相关系数R 2均高于0.90,说明两参数Weibull分布理论能够较好的应用于SFRC和SICRC疲劳寿命检验。In this experiment,MTS material dynamic fatigue testing machine was used to conduct fatigue tests on ordinary concrete,C,RC,SFRC,SICRC after temperature cycling treatment,and the fatigue deformation characteristics and fatigue life of each specimen under different stress levels were studied.Based on the test data,the fatigue life of each specimen was tested by two-parameter Weibull distribution,and the p-S-N equations were established.The result shows that compared with RC and SFRC,SICRC has better ductility and integrity in fatigue failure,and is difficult to break and destroy.According to the S-N curve at the same stress level,the fatigue life and fatigue strength of SICRC are better than those of RC and SFRC.The two-parameter Weibull distribution theory was used to test the fatigue life of each specimen,and the correlation coefficient R 2 was higher than 0.90,indicating that the two-parameter Weibull distribution theory can be well applied to the fatigue life tests of RC,SFRC and SICRC.

关 键 词：温度循环 金刚砂 钢纤维 疲劳寿命 两参数WEIBULL分布 p-S-N方程 

分 类 号：TU312.3[建筑科学—结构工程]