【摘要】 介绍国内外混凝土梁无损检测技术的发展及应用现状。近年来发展起来的混凝土梁无损检测新技术主要可以分为3类:一类是以应力波理论为基础的方法如冲击回波法、表面波频谱分析法、声发射技术以及超声脉冲法等;一类是以探地雷达为代表的利用电磁波的技术;另外一类是以射线作为探测媒介的方法如红外热像法、计算机断层X射线扫描技术等。实践表明,这些技术对提高混凝土梁无损检测的精度与效率具有重要意义。更多还原

【Abstract】 Three kinds of new NDT techniques have been developed.In this paper the development and application of nondestructive test technique at home and abroad in concrete beam are presented .The first type of NDT methods are based on the mechanical principle of stress wave propagation,such as impactecho method,spectral analysis of surface wave method,acoustic emission technique and ultrasonic pulse method etc.The second type is the electromagnetic wave propagationbased NDT methods,taking ground penetrating radar as an example.The third type of NDT method makes use of radiography as the medium of detection,for instance,infrared thermography and computerized tomography etc.In terms of practical experience,these techniques play an important role in increasing the accuracy and speed of many NDT investigations.更多还原