基于小波分析的火灾后灌浆套筒损伤的线性与非线性超声评价

张璐, 唐永泽, 曾家俊, 贾尚达, 李红豫, 刘其舟

振动与冲击 ›› 2025, Vol. 44 ›› Issue (9) : 303-312.

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振动与冲击 ›› 2025, Vol. 44 ›› Issue (9) : 303-312.
故障诊断分析

基于小波分析的火灾后灌浆套筒损伤的线性与非线性超声评价

  • 张璐,唐永泽,曾家俊,贾尚达,李红豫*,刘其舟
作者信息 +

Linear and nonlinear ultrasonic evaluation of post-fire grouted sleeve damage based on wavelet analysis

  • ZHANG Lu, TANG Yongze, ZENG Jiajun, JIA Shangda, LI Hongyu*, LIU Qizhou
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文章历史 +

摘要

评估火灾后预制混凝土建筑节点的安全性至关重要,可为建筑后续使用和修复提供可靠参考。半灌浆套筒连接件(Half Grouted Sleeve Connection,HGSC)是预制建筑构件中最常见的连接方式之一,其火灾后的力学性能代表着整个节点的安全性。因此,为研究火灾后HGSC的损伤,制作了3组缺陷率,共15个试件用于超声波检测试验(Ultrasonic Testing, UT),应用了5种不同火灾温度来产生不同的火灾后损伤。温度变化产生的损伤和缺陷通过UT信号的畸变表现出来,通过分析信号的差异可以区别不同的损伤程度。本文提出使用小波分析对超声波信号进行量化分析。对于线性超声波(Linear Ultrasonic Testing,LUT)检测信号,通过小波包分解(Wavelet Packet Decomposition, WPD)得到的分解等级为8的小波能量比进行分析。对于非线性超声波检测(Non-Linear Ultrasonic Testing,NLUT)信号,通过小波变换提取的一次和二次谐波超声时域信号得到声学非线性参数(Acoustic Nonlinear Parameters,ANP),并进行量化分析。结果表明,UT信号通过WPD计算的Ⅰ频段的小波包能量占比随火灾温度增加而增加,Ⅱ频段则相反,可以区分常温和受火灾影响的HGSC。通过比较不同缺陷率HGSC的小波包能量占比,可以区分无灌浆缺陷和有灌浆缺陷。ANP与火灾温度具有较强的线性相关性,可以通过ANP量化HGSC受火灾温度的影响。分析实验数据发现黏结强度同时与温度和ANP的变化存在较强的线性关系,通过建立温度和ANP同黏结强度的数学模型,即可以量化损失。因此,温度和ANP可以作为量化黏结强度的评估参数。本文的研究方法可为工程应用提供参考依据。

Abstract

Evaluation of the post-fire prefabricated concrete building, especially for the key members and its connection nodes, is crucial for the forensic investigation and the subsequent fire protection design. Usually, the connection node plays a vital role in mechanical behavior in the PC building. Herein, a grouted sleeve connection (HGSC) is one of the most common connections in precast buildings due to its excellent mechanical performance and installation convenience. Therefore, in order to assess the post-fire damage of HGSC, the combined linear and nonlinear ultrasonic testing (UT) strategy was proposed and verified experimentally. Specifically, 15 specimens with three different defect rates were fabricated, and five different fire temperatures were applied to create different post-fire damages. The damage caused by different fire temperatures directly reflects on the distortion of the UT signals. In this paper, to interpret the UT signals, we propose using the wavelet method to decompose the ultrasonic signals. For Linear Ultrasonic Testing (LUT) signals, the wavelet energy ratio obtained by wavelet packet decomposition (WPD) with a decomposition level of 8 is quantitatively analyzed. For Non-Linear Ultrasonic Testing (NLUT) signals, the acoustic nonlinear parameters (ANP) obtained from the first and second harmonic decomposition of UT signals were used to correlate with the damage. The results show that the proportion of wavelet packet energy in Band I increases with fire temperature; on the contrary, the signal energy in Band II decreases with the temperature, which can be used to distinguish post-fire damage from normal damage. While, the existence of grouting defects can be identified by wavelet packet energy ratio. The ANP shows a strong linear relationship with fire temperature, which can be used to quantify the post-fire damage in HGSC. Moreover, the bond strength exhibits a similar strong linear relationship with both temperature and ANP, allowing to quantify the loss of bond strength by these parameters. Therefore, the post-fire temperature and ANP can serve as the effective features to quantitatively evaluate the bond strength. The proposed method in this paper can provide a feasible option for evaluation of post-fire damage for in-situ application.

关键词

半灌浆套筒 / 火灾 / 线性超声波 / 非线性超声波 / 小波变换

Key words

half grouted sleeve / fire hazard / linear ultrasonics / nonlinear ultrasonics / wavelet transform

引用本文

导出引用
张璐, 唐永泽, 曾家俊, 贾尚达, 李红豫, 刘其舟. 基于小波分析的火灾后灌浆套筒损伤的线性与非线性超声评价[J]. 振动与冲击, 2025, 44(9): 303-312
ZHANG Lu, TANG Yongze, ZENG Jiajun, JIA Shangda, LI Hongyu, LIU Qizhou. Linear and nonlinear ultrasonic evaluation of post-fire grouted sleeve damage based on wavelet analysis[J]. Journal of Vibration and Shock, 2025, 44(9): 303-312

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