Conference proceeding
SAFE modeling of waves for the structural health monitoring of prestressing tendons
HEALTH MONITORING OF STRUCTURAL AND BIOLOGICAL SYSTEMS 2007, v 6532(1), pp 65320D-65320D-12
01 Jan 2007
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
This paper reports on the status of ongoing collaborative studies between UCSD, University of Bologna and University of Pittsburgh aimed at developing a monitoring system for prestressing strands in post-tensioned structures based on guided ultrasonic waves (GUWs) and built-in sensors. A Semi-Analytical Finite Element (SAFE) method was first used to compute dispersion curves of a pretwisted waveguide representing a seven-wire strand. The strand embedded in grout and surrounded by a concrete media was subsequently modeled as an axisymmetric waveguide. The SAFE method allows to account for the material damping and can be used to discriminate low loss guided modes. Experimental tests targeted at the defect detection and prestress level monitoring were performed. Notch like defects, machined in a seven wire strand, were successfully detected using a reflection-based Damage Index (D.I.) vector. The D.I. vector was extracted from GUWs measurements which were processed using Discrete Wavelet Transform (DWT). A four dimensional Outlier analysis was performed to discriminate indications of flaws. In a parallel study, transmission measurements were collected to identify wave features sensitive to prestress level in strands embedded in post-tensioned concrete blocks. The most sensitive features are being investigated further to assess their reliability in a monitoring system whit sensors embedded in a real post-tensioned concrete structure.
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Details
- Title
- SAFE modeling of waves for the structural health monitoring of prestressing tendons
- Creators
- Ivan Bartoli - Univ Calif San Diego, Dept Struct Engn, NDE, 9500 Gilman Dr, La Jolla, CA 92093 USAAlessandro Marzani - University of BolognaFrancesco Lanza di Scalea - Univ Calif San Diego, Dept Struct Engn, NDE, 9500 Gilman Dr, La Jolla, CA 92093 USAPiervincenzo Rizzo - University of PittsburghErasmo Viola - University of BolognaElisa Sorrivi - University of BolognaRobert Phillips - Univ Calif San Diego, Dept Struct Engn, NDE, 9500 Gilman Dr, La Jolla, CA 92093 USA
- Contributors
- T Kundu (Editor)
- Publication Details
- HEALTH MONITORING OF STRUCTURAL AND BIOLOGICAL SYSTEMS 2007, v 6532(1), pp 65320D-65320D-12
- Series
- Proceedings of SPIE
- Publisher
- Spie-Int Soc Optical Engineering
- Number of pages
- 12
- Grant note
- Italian Ministry for University and Scientific & Technological Research MIUR; Ministry of Education, Universities and Research (MIUR) 0221707 / U.S. National Science Foundation; National Science Foundation (NSF) 59A0538 / California Department of Transportation
- Resource Type
- Conference proceeding
- Language
- English
- Academic Unit
- Civil, Architectural, and Environmental Engineering
- Web of Science ID
- WOS:000247600300011
- Scopus ID
- 2-s2.0-35649004827
- Other Identifier
- 991020547440404721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Instruments & Instrumentation