Deformations in Composite Prestressed Concrete Bridge Deck Panels
Publication: Journal of Structural Engineering
Volume 120, Issue 11
Abstract
Prestressed concrete (PC) panels have been periodically used as permanent formwork in bridge deck construction for over 35 years. To investigate the behavior of this composite slab system at locations adjacent to abutment and pier diaphragms in skewed bridges, five full‐scale composite slab specimens were constructed and tested. Slab performance was evaluated by investigating the initial strand transfer length, monitoring the prestressing strands for slippage at the ends of the PC panels, detecting degradation of the composite behavior between PC panels and a reinforced concrete topping slab within and at the end of a span, and establishing the distribution of the bending strains along the specimen lengths. The experimental results revealed that the initial strand transfer length for bare (uncoated), 9.52‐mm diameter, seven‐wire, low‐relaxation prestressing strands was about 724 mm (28.5 in.) and that slippage of the prestressing strands and degradation of full‐composite behavior did not occur during the service or factored level load tests. Each composite slab specimen had a substantial amount of reserve strength remaining after initial strand slippage and initial breakdown of full‐composite behavior were detected. The measured PC panel compressive strains, induced during prestressing, and the monitored slab bending strains, caused by wheel footprint loads, compared well with the result predicted by simplified finite‐element analyses of the specimens.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 120 • Issue 11 • November 1994
Pages: 3223 - 3242
Copyright
Copyright © 1994 American Society of Civil Engineers.
History
Received: Aug 27, 1993
Published online: Nov 1, 1994
Published in print: Nov 1994
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