基于压电波动测量的套筒灌浆缺陷检测试验

套筒灌浆连接是当前装配式建筑中受力钢筋的主要连接方式,其灌浆质量是影响装配式混凝土结构性能的关键因素之一。运用压电陶瓷材料的驱动和传感功能,该文提出了一种基于波动分析的套筒灌浆缺陷主动检测方法,并通过试验验证其可行性,通过数值模拟分析其机理。在套筒连接钢筋表面粘贴压电片,测量健康试件和设置有不同尺寸缺陷试件上压电陶瓷传感器的输出信号,并对小波包能量进行分析和比较。结果表明,灌浆缺陷导致压电陶瓷传感器输出信号的电压幅值增大,小波包能量指标与套筒灌浆缺陷尺寸大小相关。该法能对套筒内灌浆缺陷进行有效检测。

Experiment on Detection of Sleeve Grouting Defects Based onPiezoelectric Wave Measurement

The sleeve grouting connection is the main connection method of the stressed steel bars in the current prefabricated buildings, and the grouting quality is one of the key factors affecting the performance of prefabricated reinforced concrete structures. In this paper, an active detection method for the sleeve grouting defects based on the stress wave measurement by using the driving and sensing functions of piezoelectric ceramic materials is proposed, and the feasibility is verified by experiments, and its mechanism is analyzed by the numerical simulation. The piezoelectric ceramic patches are pasted on the surface of the sleeve connecting steel bars to measure the output signals of the piezoelectric ceramic sensors on the healthy specimen and the specimen with defects with different sizes, and the wavelet packed energy(WPE) is analyzed and compared. The results show that the grouting defects lead to an increase of the voltage amplitude of the output signals of the piezoelectric ceramic sensors, and the WPE index is related ot the size of the sleeve grouting defect. The proposed method can effectively detect the grouting defects in the sleeve.