Appendix B : small beam tests.
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2013-03-01
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Alternative Title:End region detailing of pretensioned concrete bridge girders, appendix B : small beam tests.
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NTL Classification:NTL-HIGHWAY/ROAD TRANSPORTATION-Bridges and Structures;NTL-HIGHWAY/ROAD TRANSPORTATION-Design;NTL-HIGHWAY/ROAD TRANSPORTATION-Pavement Management and Performance;
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Abstract:The AASHTO LRFD Bridge Design Specifications (2007) require that confinement
reinforcement be placed around prestressing strands in the bottom bulb of pretensioned concrete
beams. Although the AASHTO specifications contain prescriptive requirements for the quantity
and placement of confinement reinforcement, the effect of such reinforcement on the end region
behavior is not well understood.
To evaluate the function and effect of confinement reinforcement, load tests were
conducted using 28-in. deep precast-pretensioned beams. In total, twelve tests were conducted
with each specimen loaded in three-point bending at a shear span-to-depth ratio of 1.0. Load,
displacement, and strain data were collected during each test. Variables in the test program
included strand size, strand quantity, prestressing force, and the presence or lack of confinement
reinforcement.
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