【摘要】 对混凝土构件进行超声无损检测,超声波的振幅参数对混凝土构件中的缺陷(裂缝)最敏感,在耦合良好和测试条件基本一致时,振幅值的大幅衰减可作为判断混凝土构件存在缺陷的主要依据。超声波的速度参数对微小裂隙不敏感,缺陷较大会引起速度值的显著下降;频率参数用于检测混凝土构件缺陷不够敏感;对混凝土构件缺陷进行超声检测,速度变化和频率变化只能作为参考因素。超声波通过裂缝与未过裂缝,波形存在明显差异,通过裂缝后,有时会出现很大周期的波列,可作为判断缺陷的重要依据。综合分析超声波运动学和动力学各参数的变化,能够提高检测的准确性。更多还原

【Abstract】 When using nondestructive ultrasonic testing for concrete components testing is used,the amplitude is the most sensitive parameter to reflect the defects of the components. So the attenuation degree of amplitude can be the chief criterion of the components having defects when the testing process in nice coupling and consistent testing condition. In the course of ultrasonic testing,the velocity parameter is not sensitive for the little defects and the velocity will prominent descend when big defects,and the frequency parameter is also not sensitive for testing concrete defects. So using nondestructive ultrasonic testing for concrete components testing,the velocity and frequency parameter can only be the reference parameters. According to the contrast of the ultrasonic transit or non-transit crack,we can find that the ultrasonic figures have obvious difference and sometimes there will be big periods wave character when ultrasonic transit the crack. The veracity of the testing can be improved under the synthetically analysis of ultrasonic parameters’ change of ultrasonic kinematics and dynamics.更多还原