摘要
对不同材料组分的12组48个混凝土试件进行不同荷载条件下的超声波测试，研究了混凝土应力与声速、首波振幅、最大振幅等声学参数的相关性。同时，利用傅罩叶变换和小波变换对测试信号进行处理，分析了主频、主频幅值、谱面积以及加权波谱参数等与应力的相关关系，得到了混凝十声学参数同应力的相关性。研究表明：主频与应力不敏感；声速与应力有一定的敏感性，稳定性较好；声幅能反映混凝土内部应力的变化，但稳定性较差：加权谱面积同应力有较好的敏感件和稳定性。是超声脉冲能量的综合反映。
An ultrasonic test of 48 concrete specimens under different loading conditions was completed, and the variation of ultrasonic pulse velocity, amplitude of first wave and maximal amplitude with the stress in concrete were researched. Contemporary, the Fourier transform and wavelet transform were used to deal with the ultrasonic signals, and it is the correlation of major frequency, amplitude of major frequency, spectrum area and stress of concrete that were analyzed. On these bases, the correlation of acoustic parameters and stress of concrete was proposed. The research shows that major frequency isn＇t sensitive to stress; the change of ultrasonic velocity and amplitude are insignificant; and the correlation between weighted spectral area and stress is sensitive and stable.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2005年第A01期4988-4996,共9页
Chinese Journal of Rock Mechanics and Engineering
基金
教育部重点科技项目（地方03113）
关键词
建筑材料
混凝土
声学参数
小波变换
应力
building material
concrete
acoustic parameters
wavelet transform
stress
