矩形钢管砼截面内缺陷对不同路径波动测量的影响

Effect of Internal Defects in the Cross Section of Concrete-Filled Rectangular Steel Tubes on Stress Wave Measurement Along Different Path

钢管混凝土结构在超高层建筑中的应用日益广泛,由于施工质量控制不到位及混凝土材料收缩等原因,其内部可能出现核心混凝土空洞缺陷及混凝土与钢管壁间的界面剥离缺陷,进而对其力学性能带来负面影响。该文针对矩形钢管混凝土截面的缺陷检测,在表面粘贴压电陶瓷片进行测量,对这两种内部缺陷在不同测试路径上压电陶瓷片响应的影响进行试验和数值模拟分析。通过对健康、存在核心混凝土空洞和界面剥离缺陷的不同试件不同检测路径上压电传感器输出信号的比较,研究了缺陷对应力波传播的影响,并得到采用对测方式检测的敏感范围。结果表明采用对测方法可有效检测钢管混凝土缺陷,其敏感范围的确定具有工程意义。

The concrete-filled steel tubes(CFST) structures are increasingly widely used in super high-rise buildings. Due to inadequate construction quality control and the shrinkage of concrete materials, the mechanical behavior is negatively affected by the possible concrete core defect and the interface debonding between the concrete and the steel tube. In this paper, for the purpose of detecting the defects in CFST, the piezoelectric ceramic plate is mounted on the surface for measurement, and the influences of these two internal defects on the responses of the piezoelectric ceramic plate on different test paths are tested and numerically simulated. By comparing the output signals of the piezoelectric sensors on different detection paths of different specimen that are healthy and have concrete core defect and interface debonding defect, the effects of the defects on the stress wave propagation are investigated and the sensing range of detection with the patch and catch method is obtained. The results show that the proposed method can effectively detect the effects of the concrete-filled steel tube, and the determination of the sensing range provides a reference for the sensor arrangement in engineering application.