Yan Shi, Dai Yong, Zhao Putian, Liu Weiling
School of Civil Engineering, Shenyang Jianzhu University, Shenyang Liaoning, China.
J Appl Biomater Funct Mater. 2018 Jan;16(1_suppl):70-80. doi: 10.1177/2280800017753051.
Steel-concrete composite structures are playing an increasingly important role in economic construction because of a series of advantages of great stiffness, good seismic performance, steel material saving, cost efficiency, convenient construction, etc. However, in service process, due to the long-term effects of environmental impacts and dynamic loading, interfaces of a composite structure might generate debonding cracks, relative slips or separations, and so on, lowering the composite effect of the composite structure.
In this paper, the piezoceramics (PZT) are used as transducers to perform experiments on interface debonding slips and separations of composite beams, respectively, aimed at proposing an interface damage identification model and a relevant damage detection innovation method based on PZT wave technology.
One part of various PZT patches was embedded in concrete as "smart aggregates," and another part of the PZT patches was pasted on the surface of the steel beam flange, forming a sensor array.
A push-out test for four specimens was carried out and experimental results showed that, under the action of the external loading, the received signal amplitudes will increasingly decrease with increase of debonding slips along the interface. The proposed signal energy-based interface damage detection algorithm is highly efficient in surface state evaluations of composite beams.
钢 - 混凝土组合结构由于具有刚度大、抗震性能好、节省钢材、成本效益高、施工方便等一系列优点，在经济建设中发挥着越来越重要的作用。然而，在服役过程中，由于环境影响和动荷载的长期作用，组合结构的界面可能会产生脱粘裂缝、相对滑移或分离等情况，从而降低组合结构的组合效应。
本文采用压电陶瓷（PZT）作为换能器，分别对组合梁的界面脱粘滑移和分离进行试验，旨在提出基于PZT波技术的界面损伤识别模型及相关损伤检测创新方法。
将不同的PZT片一部分作为“智能骨料”埋入混凝土中，另一部分粘贴在钢梁翼缘表面，形成传感器阵列。
对4个试件进行了推出试验，试验结果表明，在外部荷载作用下，随着界面脱粘滑移的增加，接收信号幅值会逐渐减小。所提出的基于信号能量的界面损伤检测算法在组合梁表面状态评估中具有很高的效率。
