00676686

Component

http://onlinepubs.trb.org...trr/1994/1458/1458-003.pdf

https://scholar.google.co...sset&publication_year=1994

An unidentified vehicle struck the bottom of a railroad overpass in Austin, Texas, and severely damaged one of the concrete beams in the overpass structure. The damaged beam was removed and taken intact to the University of Texas at Austin where the spectral analysis of surface waves (SASW) method was used to delineate nondestructively the damaged zones. SASW measurements performed on the overpass beam revealed a significant velocity contrast between damaged and undamaged zones. Damaged zones exhibited velocities ranging from 4,000 to 6,900 ft/sec (1,200 to 2,100 m/sec), depending on the extent of cracking. Velocities of undamaged zones ranged from 7,100 to 9,000 ft/sec (2,150 to 2,750 m/sec), with most values around 7,800 ft/sec (2,400 m/sec). The measurements were consistent with visual inspection of the beam. More important, the measurements indicated the presence of cracking that was not visually detectable.

This paper appears in Transportation Research Record No. 1458, Concrete Research. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved

01401262

English

p. 14-19

1994

Transportation Research Record

0309060656

Figures (8) ; References (15)

Beams; Concrete; Cracking; Nondestructive tests; Rayleigh waves; Spectrum analysis

Spectral analysis of surface waves

Concrete beams

Bridges and other structures; Design; Highways; Materials; I24: Design of Bridges and Retaining Walls; I32: Concrete

TRIS, TRB

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