Seismic performance of an I-girder to inverted-T bent cap bridge connection

dc.contributor.advisor Sri Sritharan
dc.contributor.author Snyder, Richard
dc.contributor.department Civil, Construction, and Environmental Engineering
dc.date 2018-08-11T16:12:11.000
dc.date.accessioned 2020-06-30T02:38:53Z
dc.date.available 2020-06-30T02:38:53Z
dc.date.copyright Fri Jan 01 00:00:00 UTC 2010
dc.date.embargo 2013-06-05
dc.date.issued 2010-01-01
dc.description.abstract <p>This thesis represents a portion of the research conducted as part of an investigation for the California Department of Transportation (Caltrans) regarding the seismic response and overall moment capacity of precast I-girder to inverted-T bent cap bridge connections for seismic applications. The current design practice, as outlined by Caltrans' Seismic Design Criteria, assumes that the connection between the precast I-girders and the inverted-T bent cap will degrade in a seismic event and shall therefore be designed as a pinned connection, 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 girder-to-cap connection region. Additionally, per the request of Caltrans, an improved girder-to-cap connection detail was developed in order to ensure a fully continuous moment connection between the I-girders and inverted-T bent cap.</p> <p>A finite element grillage model was developed using SAP2000 and was used to predict the global and local responses of various aspects of the test unit. The test unit was constructed and tested in two phases of quasi-static cyclic testing. The first phase was a horizontal load test phase, which simulated the effects of gravity and seismic loads on the entire test unit. The second phase was a vertical load test phase, which specifically focused on the positive and negative moment capacity of the connection. Both the results of the finite element grillage model and the testing were used to make conclusions regarding the performance of I-girder to inverted-T bent cap bridges.</p> <p>It was concluded 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.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/etd/11889/
dc.identifier.articleid 2844
dc.identifier.contextkey 2808042
dc.identifier.doi https://doi.org/10.31274/etd-180810-2981
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath etd/11889
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/26095
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/etd/11889/Snyder_iastate_0097M_11662.pdf|||Fri Jan 14 19:00:22 UTC 2022
dc.subject.disciplines Civil and Environmental Engineering
dc.subject.keywords Bridge
dc.subject.keywords Connection
dc.subject.keywords Grillage
dc.subject.keywords I-girder
dc.subject.keywords Inverted-T
dc.subject.keywords Seismic
dc.title Seismic performance of an I-girder to inverted-T bent cap bridge connection
dc.type article
dc.type.genre thesis
dspace.entity.type Publication
thesis.degree.level thesis
thesis.degree.name Master of Science
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