混凝土嵌入式压电动态剪应力传感器研发

制作了一种利用剪切型压电陶瓷片作为传感元件的可用于混凝土内部动态剪应力测量的传感器,提出了一种标定试验方法,即将动态剪应力传感器嵌入混凝土空心薄壁空心圆筒中,并利用小型落锤试验机,对空心薄壁圆筒施加冲击荷载根据剪力计算值与传感器的输出信号对传感器灵敏度进行标定。试验结果表明,传感器输出与剪应力的线性相关性好,不同传感器之间的灵敏度个体差异小。

Development of Embedded PZT Based Dynamic Shear Stress Sensors for Concrete Structures

An embedded dynamic shear stress measurement sensor using shear type PZT patches are developed for the inner shear stress measurement of concrete structures and an experimental method of calibration are proposed:By use of a free falling weight, an impact load was applied on the hollow thin wall concrete cylinder eccentrically.Based on the measured output of the shear stress sensors and the calculated shear stress on the cross section of the cylinder specimen,a linear regression was employed to determine the sensitivity of the developed sensors.The test results show that the developed dynamic shear stress sensors response linearly with the loading and the sensitivity of the developed sensors with identical sensing elements have a very close sensitivity.