|Table of Contents|

Method of locating grouting voids in prestressed tendon ducts based on second harmonic(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2025年6期
Page:
87-96
Research Field:
桥梁智能运维与防灾减灾
Publishing date:

Info

Title:
Method of locating grouting voids in prestressed tendon ducts based on second harmonic
Author(s):
JIA Jun-feng1;  LIU Ruo-fei1;  ZHANG Long-guan1;  LI Sheng-li2;  LIU Zi-yong3
(1. State Key Laboratory of Bridge Safety and Resilience, Beijing University of Technology,Beijing 100124, China; 2. School of Civil Engineering, Zhengzhou University, Zhengzhou 450001,Henan, China; 3. Luoyang Liye Construction Quality Inspection Co., Ltd., Luoyang 471003, Henan, China)
Keywords:
bridge engineering;  grouting defect;  void location;  second harmonic;  contact acoustic nonlinearity;  ultrasonic guided wave;  post-tensioned prestressed concrete structure
PACS:
U446
DOI:
-
Abstract:
The longitudinal guided wave second harmonics were employed to locate grouting voids in prestressed tendon ducts. Through theoretical analysis, numerical simulation, and experimental test, the excitation, propagation, and reception behaviors of longitudinal guided wave in grouted steel strands were investigated. Based on the principle of second harmonic generation caused by the interface interaction between ultrasonic guided waves and contact-type damage, as well as the group velocity dispersion curve of grouted steel strands, a location formula for detecting grouting voids in prestressed tendon ducts was established. In the 3D model of the void specimen, the surface-to-surface contact was used to simulate the void damage. For the beam specimen model, the steel strands wrapped in pearl cotton were used to simulate the void damage. In both the numerical simulation and experimental test, the time-domain and frequency-domain response signals of intact and void specimens were compared. The proposed location formula, time-frequency analysis, and normalized wavelet coefficients were applied for the void location. The research results indicate that unlike the linear guided wave, the proposed method does not rely on the baseline data and is sensitive to minor damage. The results of numerical simulation and experimental study are consistent. In the frequency-domain signal and time-frequency spectrum of void specimens, second harmonic frequency components appear alongside the fundamental frequency component, whereas only the fundamental frequency component presents in the intact specimen. The presence of the second harmonic suggests that the interaction between the incident wave and the void defect triggers a collision mechanism, resulting in contact acoustic nonlinearity and transferring energy to the second harmonic frequency. Therefore, thelongitudinal guided wave second harmonics can qualitatively detect the grout voids. The estimated void locations all fall within the actual value range and can be located without the baseline data. The relative error between the estimated and actual values is within 6%.3 tabs, 13 figs, 31 refs.

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Last Update: 2025-12-20