Abstract

The civil infrastructures constructed using self-compacting concrete (SCC) reinforced with fiber-reinforced polymer (FRP) bars are advocated for engineering applications due to corrosion resistance and environmental-friendly performance. The bond behavior between FRP reinforcement and SCC is a significant factor affecting the serviceability and failure mechanism of this composite structure. However, it is hard to identify the damage mechanism and failure mode of the interface bond using the traditional test methods. Therefore, an effective monitoring method of interface damage using piezoceramic transducers is proposed in this paper. A series of pull-out tests were performed, and the test variables involved concrete materials and reinforcing bar types. A lead zirconate titanate (PZT) patch transducer acting as an actuator was bonded on the outer surface of reinforcing bars, and a piezoceramic smart aggregate transducer acting as a sensor was embedded in the SCC. A wavelet energy ratio index (WERI) is proposed to identify the damage mechanism of interface between reinforcing bars and SCC. The experimental test results reveal that the damage mechanism and failure mode of the bond between different reinforcing bars and concrete materials can be identified effectively and the peak of bond stress can be captured accurately by using WERI values.

Graphic abstract

中文翻译：

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基于小波能量分析的压电换能器识别FRP /钢与自密实混凝土之间的粘结性能

摘要

使用具有纤维增强聚合物（FRP）筋的自密实混凝土（SCC）建造的民用基础设施因其耐腐蚀和环保性能而被提倡用于工程应用。FRP增强材料和SCC之间的粘结行为是影响该复合结构的使用寿命和破坏机理的重要因素。但是，使用传统的测试方法很难确定界面键的损坏机理和失效模式。因此，本文提出了一种使用压电陶瓷换能器的界面损伤的有效监测方法。进行了一系列拉拔测试，测试变量涉及混凝土材料和钢筋类型。用作致动器的锆酸钛酸铅（PZT）贴片换能器粘结在钢筋的外表面上，并且用作传感器的压电陶瓷智能骨料换能器嵌入SCC中。提出了一种小波能量比指数（WERI）来识别钢筋与SCC界面的损伤机理。实验结果表明，利用WERI值可以有效地识别出不同钢筋与混凝土之间粘结的破坏机理和破坏方式，并可以准确地捕获粘结应力的峰值。

图形摘要