STATIC LIVE LOAD TESTS ON A CABLE-STAYED BRIDGE
A 91.4-m (300-ft) fracture critical cable-stayed bridge near Skagway, Alaska, carries conventional traffic and 712-kN (160,000-lb) ore trucks. The bridge has a laminated timber deck supported by transverse floor beams spanning two stiffened ASTM A588 steel box girders. Two inclined cables stay each girder near midlength to a single tower. The abutments and tower are rock-anchored to the canyon walls. The bridge was instrumented and field tested with statically positioned trucks to help determine boundary conditions provided by rock anchor supports and assess behavior for non-AASHTO ore trucks. Two types of trucks were used to load the bridge: (a) a 176.84-kN (39.74-kip) snooper truck, and (b) four different ore trucks with weights from 699.1 to 701.1 kN (155.1 to 157.6 kips). A fracture critical inspection was also conducted and cracks were found. Strain, girder deflection, a temperature profile of the girder, wind velocity, solar radiation, and ambient air temperature were monitored. Experimental deflections and strains compared with a traditional two-dimensional (2-D) analysis are presented. Maximum strains for ore truck static load tests were: 224 microstrain (276 calculated) in the box girder and 134 microstrain (193 calculated) in the tower support. Ore truck loads did not vary significantly and like loading produced excellent repeatability. For this structure, a 2-D analysis provided satisfactory results for symmetric loads; conservative answers on the loaded side for asymmetric loads. A three-dimensional analysis is suggested for modifications. Rock anchors acted as fixed supports.
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Supplemental Notes:
- This paper appears in Transportation Research Record No. 1393, Structures. 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
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Authors:
- Hulsey, J Leroy
- Delaney, David K
- Publication Date: 1993
Language
- English
Media Info
- Features: Figures; References; Tables;
- Pagination: p. 162-174
- Monograph Title: Structures
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Serial:
- Transportation Research Record
- Issue Number: 1393
- Publisher: Transportation Research Board
- ISSN: 0361-1981
Subject/Index Terms
- TRT Terms: Boundary value problems; Bridges; Cable stayed bridges; Cracking; Deflection; Field tests; Inspection; Live loads; Static tests; Strain (Mechanics)
- Uncontrolled Terms: Boundary conditions; Bridge inspection; Repeatability; Two dimensional analysis
- Old TRIS Terms: Ore trucks; Rock anchor supports; Strains
- Subject Areas: Bridges and other structures; Design; Highways; I24: Design of Bridges and Retaining Walls;
Filing Info
- Accession Number: 00637834
- Record Type: Publication
- ISBN: 0309054664
- Files: TRIS, TRB, ATRI
- Created Date: Oct 15 1993 12:00AM