基于PZT和DIC对木构件榫卯松动监测试验研究

Experimental Study on Monitoring the Tenon Looseness of Wood Members Based on PZT and DIC

榫卯松动是木结构产生损伤的主要原因,为准确评估木构件的榫卯松动程度,采用压电陶瓷和数字图像相关法对木构件拔榫距离进行监测试验。首先基于压电陶瓷主动感应法和小波包能量法得到时域信号图,分析拔榫距离与电压值的关系。然后利用数字图像法实时检测拔榫过程中榫卯表面应变场信息变化。结果表明:拔榫距离越大,传感器接收能量和电压值越少;数字图像法可实时监测构件表面应变场信息变化,并根据应变演化规律检测木构件拔榫距离。试验结果可为木构件榫卯松动程度的检测研究与实际工况测量提供依据。

The looseness of mortise and tenon is the main cause of damage to wood structures.In order to accurately evaluate the degree of tenon looseness of wood components,in this paper,the tenon removal distance of wood components was detected by piezoelectric ceramics and digital image.Firstly,the relationship between tenoning distance and voltage value was analyzed by time-domain signal graph from the piezoelectric active induction method and wavelet packet energy method.Then,the change of strain field information on the surface of mortise and tenon during tenoning were detected by the digital image method.The results showed that the larger the tenoning distance was,the less energy and voltage the sensor receives.The digital image method can monitor the change of strain field information on the surface of components in real time.The tenoning distance of wood components can be measured according to the strain evolution law.The test results could provide reference for the research and detection of the degree of tenon looseness of wood components,as well as guidance for the measurement of actual working conditions.