钢管混凝土内部孔洞缺陷监测试验

Testing research on defect monitoring of CFST internal holes

开展了钢管混凝土内部孔洞缺陷监测试验,提出了将压电材料制成埋入式压电传感器,通过布置监测系统,利用波动分析法的原理对钢管混凝土内部孔洞缺陷进行测量和分析的监测方法。设计了具有不同直径内部孔洞的钢管混凝土试件和间距不同的传感器监测组,从基于幅值和声时的时域分析角度和基于小波包能量的频域分析角度对应力波测量结果进行了对比分析。结果表明,提出的监测方法可以识别钢管混凝土内部孔洞缺陷的情况。

The monitoring test of internal hole defects of concrete filled steel tube was carried out.A monitoring method was proposed for measuring and analyzing the hole defects in the concrete filled steel tube,in which manufacturing embedded piezoelectric sensor by using piezoelectric material,by arranging the monitoring system and using the principle of wave analysis.Concrete filled steel tubular specimens with internal holes of different diameters and sensor monitoring groups with different spacings were designed experimentally.The stress wave measurement results were compared and analyzed from the perspective of time-domain analysis based on amplitude and wave velocity and frequency-domain analysis based on wavelet packet energy.The results showed that the proposed monitoring method can accurately identify the internal hole defects of concrete filled steel tube.