To study the effect of environmental temperature on the ultrasonic coda signal of concrete,the ultrasonic coda signal of concrete I-beams was collected under indoor natural environmental conditions under changes in environmental temperature.Using Taylor expansion,analyze and process the ultrasonic wake signal in different temperature ranges,gradually extract the temperature effect components of each order in the signal and remove them one by one,and establish a fitting relationship between the amplitude projection coefficients of each order and the temperature effect.The results show that the goodness of fit between the first-order amplitude projection coefficient and the temperature effect fitting line is higher than 0.98;After removing the first and second order temperature effect components,the average decorrelation coefficient can be reduced by more than 97％.
关键词
温度效应/混凝土/泰勒展开/超声尾波/投影系数
Key words
temperature effect/concrete/Taylor expansion/ultrasonic coda wave/projection coefficient
万方数据