Vibration-Based Damage Detection for a Prestressed Concrete Box Girder by Means of Subspace Analysis
Publication: ASCE-ASME Journal of Risk and Uncertainty in Engineering Systems, Part A: Civil Engineering
Volume 7, Issue 4
Abstract
Vibration-based damage detection for civil structures has been actively investigated. Many acceleration-based damage detection methods have been developed, among which the subspace-based system identification theory has been well established and has been a popular way to identify the structure’s modal parameters, having the advantage of being non-iterative and computationally tractable. Nevertheless, traditional modal parameters, including modal frequencies, mode shapes, and damping ratios, are not always sensitive to damage in actual civil structures. In this paper, a series of static loading tests and nondestructive hammer tests were applied to a prestressed concrete (PC) box girder. After analyzing the structure by the traditional modal analysis method, a technique based on null subspace analysis is proposed to monitor the health state of the PC box girder, and an index reflecting the damage levels is proposed. Compared with traditional modal parameters, the proposed damage index shows higher sensitivity and efficient precision to distinguish different structural damage levels. What is more, the damage caused by fracturing of prestressing tendons, which only slightly affect changes in modal frequencies, can also be obviously observed by this method.
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Data Availability Statement
The experiment data that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This study was partly supported by a Japanese Society for the Promotion of Science (JSPS) Grant-in-Aid for Scientific Research (B) under Project No. 19H02225, which is greatly appreciated. Furthermore, the first author expresses his appreciation for support from the China Scholarship Council (No. 201906090265) in both life and research.
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© 2021 American Society of Civil Engineers.
History
Received: Feb 2, 2021
Accepted: Jul 6, 2021
Published online: Aug 10, 2021
Published in print: Dec 1, 2021
Discussion open until: Jan 10, 2022
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