Seismic Performance of an I-Girder to Inverted-T Bent Cap Connection

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Seismic Performance of an I-Girder to Inverted-T Bent Cap Connection

Author: Snyder, Rick Vander Werff, J R Thiemann, Zach Sritharan, Sri | Size: 10.83 MB | Format: PDF | Quality: Unspecified | Publisher: Iowa State University, Ames | Year: 2011 | pages: 306

California Department of Transportation (Caltrans) current design practice assumes that connections between precast I-girders and inverted-T bent caps will degrade in a seismic event, making the precast girder option for seismic bridges inefficient. A prototype I-girder to inverted-T bent cap bridge and a 50% scale test unit was designed in order to investigate the behavior of the as-built girder-to-cap connection region. Analysis of test results shows that the current I-girder to inverted-T bent cap bridge connection is capable of acting as a fully continuous connection for both positive and negative moments during both gravity and seismic loading, contrary to the design assumptions stated in Caltrans’ Seismic Design Criteria. The improved connection detail demonstrated the ability to ensure a fully continuous moment connection between the I-girders and inverted-T bent cap. Both connection details also exhibited a significant moment resistance beyond what was expected during the vertical load test although the as-built connection eventually failed under positive moments at moderate to large displacements.

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