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为了建立声发射参数与钢筋混凝土梁受力特征之间的关系,进行了钢筋混凝土梁的四点弯曲试验和声发射测试试验.通过预加载和断铅试验,给出了适用于钢筋混凝土梁的门槛值确定方法、时间参数(峰值定义时间、撞击定义时间和撞击闭锁时间)确定方法、声发射波速的测定方法,以及相应的测试结果.通过四点弯曲试验和声发射测试试验,得到了振幅、振铃计数、能量和上升时间等声发射参数随荷载的变化关系,揭示了利用上述声发射参数表征钢筋混凝土梁受力特征的规律和方法.基于声发射参数,通过计算得到了试件在初始开裂和屈服时的裂缝分布情况,与试验结果相比,在裂缝数量和裂缝位置上,均吻合较好.
In order to establish the relationship between the acoustic emission parameters and the mechanical characteristics of reinforced concrete beams, the four-point bending test and the acoustic emission test of the reinforced concrete beam were carried out.The threshold values suitable for reinforced concrete beams Determination method, determination method of time parameters (peak definition time, impact definition time and impact lock-up time), measurement method of acoustic emission wave velocity and corresponding test results. Through four-point bending test and acoustic emission test, The law and method of characterizing the mechanical behavior of reinforced concrete beams using the acoustic emission parameters described above are revealed based on the variation of acoustic emission parameters such as bell count, energy and rise time with load.According to acoustic emission parameters, When compared with the test results, the number of fractures and the location of cracks are in good agreement.