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Title: TESTS OF CONCRETE BRIDGE COLUMNS WITH INTERLOCKING SPIRAL REINFORCEMENT
Accession Number: 00637831
Record Type: Component
Availability: Find a library where document is available Abstract: The behavior of concrete bridge columns incorporating interlocking spirals under flexural, shear, and torsional loadings was investigated experimentally. Tests were performed on approximately 1/5-scale column specimens subjected to increasing levels of cycled inelastic displacements under constant axial load. Rectangular and oval cross sections with either two interlocking spirals or conventional ties were investigated. Variables studied included the performance of interlocking spirals compared to ties, the amount of spiral overlap, and the size of longitudinal bars required in the overlap region to maintain spiral interlock. Column performance was evaluated in terms of lateral load capacity, strength degradation, evergy dissipation, and failure mechanisms. Columns with interlocking spirals performed as well or better than columns with ties, despite approximately 50% more transverse reinforcement being provided in the tied columns. Test results indicated improved performance when the center-to-center spacing of interlocking spirals was not greater than 0.6 times the spiral diameter. At least four longitudinal bars of approximately the same size as the main longitudinal reinforcement are required in the overlap region to maintain spiral interlock. When adequate longitudinal bars and spiral overlap were provided, the spirals remained interlocked even when loaded to large displacements thus preserving load transfer between the spirals.
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
Monograph Title: Monograph Accession #: 01403235
Language: English
Authors: Buckingham, Grant CMcLean, David INelson, C ErnestPagination: p. 133-145
Publication Date: 1993
Serial: ISBN: 0309054664
Features: Figures
(11)
; Photos
(5)
; References
(5)
; Tables
(3)
TRT Terms: Uncontrolled Terms: Old TRIS Terms: Subject Areas: Bridges and other structures; Design; Energy; Highways; I24: Design of Bridges and Retaining Walls
Files: TRIS, TRB, ATRI
Created Date: Oct 15 1993 12:00AM
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