静载和疲劳荷载作用下橡胶混凝土声发射特性研究

Acoustic Emission Characteristics of Rubber Concrete Under Static Load and Fatigue Load

为研究橡胶混凝土在静载和疲劳荷载下的声发射特征参数与橡胶混凝土损伤程度的关系,基于声发射开展了静载和疲劳荷载下不同橡胶掺量的橡胶混凝土的三点弯曲断裂试验。利用声发射的能量、累积能量和幅值等参数,评估混凝土的损伤程度。试验结果表明:静载作用下,通过分析能量参数可将混凝土损伤过程分为三个阶段,通过分析幅值参数可将混凝土损伤过程分为两段;疲劳荷载作用下,通过分析累积能量变化可将混凝土损伤过程分为两个阶段,分析幅值变化可将混凝土损伤过程分为三段。静载下随橡胶掺量的增加,声发射信号减少,疲劳荷载下,随橡胶掺量的增加声发射信号增加。掺入橡胶后能够提高混凝土的阻裂能力并增强混凝土承受损伤的能力。

In order to analyze the relationship between acoustic emission characteristic parameters and damage of rubber concrete under static load and fatigue load,this paper carried out three-point bending fracture test of rubber concrete with different rubber content under static load and fatigue load based on acoustic emission.The damage degree of concrete through parameters such as acoustic emission signal energy,accumulated energy and amplitude were evaluated.The test results show that under static load,the concrete damage process can be divided into three sections through energy analysis,and the concrete damage process can be divided into two sections through amplitude analysis.Under fatigue load,the concrete damage process can be divided through cumulative energy changes.There are two stages,and the analysis of amplitude changes can divide the concrete damage process into three stages.The acoustic emission signal decreases with the increase of rubber content under static load,and the acoustic emission signal increases with the increase of rubber content under fatigue load.The addition of rubber can improve the crack resistance of concrete and enhance the ability of concrete to withstand damage.