带预裂纹混凝土单双轴疲劳试验分析

Experimental Study on Uniaxial and Multiaxial Fatigue Strength of Pre-cracked Concrete

为研究带预裂纹混凝土的疲劳性能,采用微机控制电液伺服多轴疲劳子结构试验系统,对带预裂纹的混凝土进行了单轴、双轴疲劳试验。试验得到不同应力幅值下的单、双轴疲劳寿命,通过处理分析试验数据,并利用MATLAB对试验数据进行拟合,得到在单、双轴荷载作用下混凝土的疲劳寿命S-N曲线以及P-N曲线,由此得出混凝土疲劳应力与疲劳寿命之间的相互关系。

For the research on the fatigue performance of pre-cracked concrete,the uniaxial and multiaxial fatigue tests have been taken on pre-cracked concrete with testing system of electro-hydraulic servo multiaxial fatigue substructure controlled by microcomputer.With results of the uniaxial and multiaxial fatigue life,experimental data have been processed and analyzed.Fitting the experimental data by MATLAB,shows the concrete fatigue life of S-N curve and P-N curves,and establishes the relationship between concrete fatigue stress and fatigue life.