受火后混凝土损伤深度的超声波检测算法研究

Research on Algorithm of Ultrasonic Detection for Damaged Depth of Concrete after Fire

CECS 21:2000规程的超声波平测算法在受火后混凝土损伤深度评估应用中误差较大,为此进行了改进.采用双曲线模型模拟混凝土损伤沿混凝土深度方向的变化,采用抛物线模型模拟不同混凝土深度处超声波的传播路径,导出了改进算法公式并使用Matlab软件进行了编程和计算.将改进算法的计算结果与超声波实测数据进行对比,结果表明改进算法的计算结果具有较高的精度.改进算法可更合理、更精确地评估受火后混凝土的损伤深度.

As single-sided ultrasonic algorithm introduced by code CECS 21：2000 is not accurate in practical application in assessment of the damaged depth of concrete after fire, improvement has been made in this paper. Hyperbola curves were used to simulate the trends of damage along concrete depth while parabolic curves were used to simulate the traces of ultrasonic wave in different concrete depth. The programming and calculation work were completed by Matlab compiler. Calculating results from modified algorithm shows more accuracy by comparing it with measured data. Modified algorithm can assess the damaged depth of concrete more feasible and accurate.