纳米材料的装配式混凝土结构界面损伤监测试验研究

Experimental study on interface damage monitoring ofprefabricated concrete structure based on nano-materials

为研究装配式混凝土结构的界面脱粘性能,采用压电陶瓷传感器对含/未含纳米材料的混凝土梁进行损伤监测。利用小波包理论分析加载下混凝土梁的界面脱粘损伤与能耗之间的关系。试验结果表明:与未含纳米材料的混凝土梁相比,含纳米材料的混凝土梁界面脱粘性能得到了很大改善。时域分析、小波包能量和损伤指标很好地解释了因纳米材料的加入提高混凝土梁强度的原因和定性地识别界面脱粘损伤程度。试验研究证明了基于压电陶瓷传感器的主动传感方法在装配式结构不可修复的界面损伤检测中具有极大的应用潜力。

In order to study the interfacial debonding performance of prefabricated concrete structures,piezoceramic sensors are used to monitor the damage of concrete beams with/without nanomaterials.The wavelet packet theory is used to analyze the relationship between the interface debonding damage and energy consumption of the loaded beams.The experimental results show that the interfacial debonding performance of concrete beams with nanomaterials is significantly improved compared with concrete beams without nanomaterials.Time domain analysis,wavelet packet energy and damage indicators explain the reasons for the enhancement of the strength of concrete beams due to the addition of nanomaterials and qualitatively identify the degree of interface debonding damage.The experimental research proves that the active sensing method based on piezoceramic sensor has great potential to be applied in practice for inaccessible damage detection of prefabricated concrete structures interfaces.