Abstract
Real‐time assessment of timber‐surface crack repair is crucial to the stability and safety of timber structures. Epoxy resin was used to repair timber cracks, and the active sensing technique using piezoelectric ceramics was applied to monitor the repair process of timber surface cracks in real time. Sixteen wood samples were designed for axial compression tests and active monitoring tests. A pair of lead zirconate titanate patches was pasted on the surface of the timber specimens as actuators and sensors for signal transmission and reception, through wavelet packet analysis, the variations in the signal amplitude, and wavelet coefficients. The relationship between the wavelet packet energy of the monitoring signal and the ultimate bearing capacity of the specimens at different periods after grouting was established. Based on the root‐mean‐square deviation, the damage index, DI, was introduced to evaluate the repair degree of timber surface cracks quantitatively. The results showed that the active sensing method can evaluate the strength development in timber‐surface crack repair in real time.
Highlights
Compared with other building structures, wooden structures often have the advantages of good seismic performance, short construction period, energy saving, and low carbon
This paper focuses on the repair process of timber structure surface cracks and conducts real-time evaluation of the repair state based on the Timber (Epoxy) Sensor active sensing technology of piezoelectric ceramics
The main reason is that the stress wave propagates based on the timber specimen as the medium, when the crack damage occurs in the specimen, the stress wave will occur reflection, refraction, and diffraction phenomena, and the energy loss will occur at the crack damage interface, which will result in the receiving signals of the PZT patches at the corresponding position weaker than that at the intact interface, and the corresponding signal amplitude is smaller
Summary
Compared with other building structures, wooden structures often have the advantages of good seismic performance, short construction period, energy saving, and low carbon. The repair and reinforcement technologies of timber structures are generally divided into traditional technologies and modern repair technologies [2]. The method of inlay is generally adopted. In terms of component connection reinforcement, the iron components are easy to rust, which will have a certain impact on wooden materials and building appearance [7, 8]. In the aspect of timber column cracks, adhesive or thermoplastic composites can be used to fill [16]. When it does not meet the stress requirements, the bearing capacity can be enhanced by seaming, built-in core material, and grafting [17,18,19]
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