基于表面波的钢管砼界面剥离检测模拟分析

钢管混凝土结构充分利用了钢管和混凝土的优点,具有优越的力学性能,被广泛应用于高层建筑及大型桥梁中。然而,钢管和混凝土间的界面剥离缺陷却会给结构力学性能带来负面影响,对隐蔽性的界面剥离缺陷进行有效检测很重要,基于同侧压电陶瓷片驱动与表面波测量进行检测易于实施。该文运用ANSYS建立了带界面剥离缺陷的钢管混凝土柱模型,通过在钢管混凝土柱表面同侧粘贴压电陶瓷(PZT)片进行驱动和传感,对具有不同长度缺陷的钢管混凝土柱的信号进行数值模拟分析,并与健康工况下的信号进行比较。数值模拟结果表明,界面剥离缺陷工况下的信号幅值较健康工况下大,且损伤程度与信号幅值改变呈正相关,损伤尺度越大,信号幅值越大。该文提出的基于表面波测量的界面剥离缺陷检测方法有效。

Simulation Analysis of Detection of Interface Debonding in Concrete filled Steel Tube Based on Surface Wave

The concrete filled steel tubular (CFST) structures make full use of the advantages of both steel and concrete, has superior mechanical properties, and has been widely used in high rise buildings and large bridges. However, the interface debonding defects between the steel tube and concrete can have a negative effect on the structural mechanical properties. It is important to effectively detect the concealed interface debonding defects, and this is easy to implement based on the same side piezoelectric ceramic sheet driving and surface wave measurement. In this paper, in order to demonstrate the feasibility of the surface debonding detection approach and to investigate its mechanism, the CFST members with different interface debinding detections and PZT patches as actuator and sensor are numerically modeled and analyzed with ANSYS considering the coupling effect between PZT and CFST member and the piezoelectric effect of PZT patches. The numerical simulation results show that the signal amplitude under the interface debonding defect conditions is larger than that under healthy conditions, and the damage degree is positively correlated with the signal amplitude change. The larger the damage scale, the larger the signal amplitude. The proposed method for detecting the interface debonding defects based on surface wave measurement is effective.