采用有限元软件ABAQUS建立含不同裂缝工况的压电-混凝土梁机电耦合模型，通过安装在混凝土梁设定位置的压电激励器输入激励信号并实时采集反馈信号，计算应力波信号值与小波包能量值，分析信号值和能量与损伤工况间的内在关系。结果表明，在混凝土梁跨中垂直裂缝和支座处斜裂缝工况下，压电应力波的信号值随裂缝深度的增加而减小；裂缝宽度增至2~3 mm时信号值会有所减小，随后裂缝宽度增加对其影响不再明显。当在裂缝演化方向上的深度达到梁体纵向中心轴高度时，应力波接收信号衰减明显。将信号相对能量值作为损伤程度因子，有利于分析应力波在病损混凝土内部的传播与衰减机理，能有效检测混凝土裂缝损伤程度。"/>
In this paper, piezoelectric-concrete beam electromechanical coupling models with different crack conditions are established using finite element software ABAQUS. The excitation signal is input by the piezoelectric actuator at the set position of concrete beam and the feedback signal is collected in real time. The stress wave signal value and wavelet packet energy value are calculated, and we explore the intrinsic relationship between the value and the damage conditions. The results show that the signal value of piezoelectric stress wave decreases with the increase of crack depth, under the condition with mid-span vertical crack and oblique crack. The signal value decreases when the crack width increases to 2~3 mm, but then the influence of the width increase is not obvious. When the depth of crack reaches the height of longitudinal center of beam in its evolution direction, the stress wave receiving signal is greatly attenuated. Using the relative energy value of the signal as the damage degree factor is beneficial to analyze the propagation and attenuation mechanism of stress wave inside the damaged concrete, and it is effective for detecting the damage degree of concrete crack."/>
混凝土裂缝压电主动传感识别仿真方法研究
Abstract：In this paper, piezoelectric-concrete beam electromechanical coupling models with different crack conditions are established using finite element software ABAQUS. The excitation signal is input by the piezoelectric actuator at the set position of concrete beam and the feedback signal is collected in real time. The stress wave signal value and wavelet packet energy value are calculated, and we explore the intrinsic relationship between the value and the damage conditions. The results show that the signal value of piezoelectric stress wave decreases with the increase of crack depth, under the condition with mid-span vertical crack and oblique crack. The signal value decreases when the crack width increases to 2~3 mm, but then the influence of the width increase is not obvious. When the depth of crack reaches the height of longitudinal center of beam in its evolution direction, the stress wave receiving signal is greatly attenuated. Using the relative energy value of the signal as the damage degree factor is beneficial to analyze the propagation and attenuation mechanism of stress wave inside the damaged concrete, and it is effective for detecting the damage degree of concrete crack.
YE Zhicheng,LIANG Yabin,FENG Qian. Research on Simulation Method of Piezoelectric Active Sensing Identification of Concrete Cracks[J]. jgg, 2020, 40(8): 870-876.
