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Title: EXPERIMENTAL VERIFICATION OF SHAKEDOWN APPROACHES FOR BRIDGE DESIGN
Accession Number: 00743570
Record Type: Component
Record URL: Availability: Find a library where document is available Abstract: Recently, it has been suggested that the lives of many deficient short-span composite bridges could be extended significantly if these structures were allowed to enter into the inelastic range for a low number of cycles. This limit state is known as the shakedown or incremental collapse limit. The results of one test with a half-scale, two-beam, two-span composite bridge aimed at clarifying some important aspects of composite behavior related to shakedown are reported. The test is unique in that various amounts of composite action (50 and 80%) were used in the two spans and in that actual moving loads were used to load the structure. The experimental and theoretical load calculations for the test compared favorably after the actual material properties were used in the section capacity calculations. The results indicate that for spans with 80% or greater interaction, the members are capable of sustaining a large number of cycles without significant strength deterioration. Although the slip at the beam-slab interface increased with cycling, strain hardening and redistribution of forces were sufficient to allow the system to reach its theoretical elasto-plastic capacity. In the span with 50% interaction, however, the maximum load achieved during the test was 30% lower than the theoretical prediction. This implied that if 50% or less of the required shear connection is provided, one should not expect the structure to carry cyclic loads into the inelastic range.
Supplemental Notes: This paper appears in Transportation Research Record No. 1594, Part 2: Structures.
Language: English
Corporate Authors: Transportation Research Board 500 Fifth Street, NW Authors: Leon, R TFlemming, D JPagination: p. 50-56
Publication Date: 1997
Serial: ISBN: 0309062020
Features: Figures
(9)
; References
(11)
TRT Terms: Uncontrolled Terms: Old TRIS Terms: Subject Areas: Bridges and other structures; Design; Highways; I24: Design of Bridges and Retaining Walls
Files: TRIS, TRB
Created Date: Dec 4 1997 12:00AM
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