单轴加载下混凝土超声波与声发射联合特性试验研究

发布时间：2018-05-08 06:16

本文选题：混凝土 + 声发射　；参考：《河北农业大学学报》2017年03期

【摘要】：本研究通过混凝土试件在单轴向受压下的试验研究,对比了不同强度等级立方体和棱柱体试件对超声波波速的影响,分析超声波及声发射参数随应力的变化关系。试验结果表明:强度等级越高的混凝土超声波波速时间稳定性表现越好;棱柱体超声波稳定性优于立方体试件;在工作应力为极限破坏应力的20%~70%阶段,超声波波速下降缓慢,声发射撞击数增加,能量和振铃计数呈突发式增长;当工作应力大于混凝土的极限破坏应力70%后,超声波波速明显下降,声发射活动急剧增加。提出划分应力阶段对2种检测方法进行分析,为混凝土结构工作应力状态的检测提供参考。
[Abstract]:Based on the experimental study of concrete specimens under uniaxial compression, the effects of cube and prism on ultrasonic wave velocities are compared, and the relationship between ultrasonic and acoustic emission parameters with stress is analyzed. The experimental results show that the higher the strength grade, the better the time stability of ultrasonic wave velocity of concrete, the better the ultrasonic stability of prism is better than the cube specimen, and when the working stress is 20% of the ultimate failure stress, the ultrasonic wave velocity decreases slowly. When the working stress is more than 70% of the ultimate failure stress of concrete, the ultrasonic wave velocity decreases obviously and the acoustic emission activity increases sharply. Two kinds of testing methods are analyzed in order to provide reference for the detection of the working stress state of concrete structure.
【作者单位】：河北农业大学城乡建设学院;
【基金】：河北省科技计划重点基础研究项目(15965401D) 河北省高等学校科学技术研究项目(ZD2015019)
【分类号】：TU528

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