Improving U-Beams for Indiana Bridges
LABORATORY TESTING DETAILS
The final phase of experimental testing is currently underway verifying the overall system behavior of U-beams. Of particular interest in these tests is the influence of strand debonding which is currently limited by AASHTO. The specimens are half-scale models of the 21st Street bridge over I-465 in Indianapolis. Two beams with a composite deck and 50% debonded strands (twice that currently allowed by AASHTO) are currently being tested. The primary variable is the shear reinforcement. These final proof tests will provide information needed to modify current AASHTO limits while improving the safety and economics of this cross-section.
SPR-3144 Robert Frosch, Principal Investigator, Michael Kreger, Co-Principal Investigator