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Composite action in bridge I-girder systems
Abstract
This thesis investigates the development of new connection systems for composite action in both concrete and steel girder bridges. The new systems will enhance and accelerate the replacement process of concrete bridge decks, and provide sufficient composite action to resist the horizontal shear at the girder-to-deck interface. The new systems include a debonded interface with formed shear key protruding from the precast girders and steel connectors for concrete girders; $1{1\over 4}$ in. diameter steel shear studs and a new "dovetail" shaped connector plate for steel girder construction. Test program consisting of horizontal shear push-off specimens, lab size beams, and full scale girders was conducted on all proposed connection schemes. Test results show that the debonded shear key system with steel connectors spaced at 24 in. along the length of the girder provides sufficient horizontal shear resistance utilizing the shear friction theory. The $1{1\over 4}$ in. diameter steel shear studs appears to have high fatigue resistance and higher $\alpha$ values as compared to both AASHTO Standard and AASHTO LRFD Specifications. The ultimate strength capacity of the $1{1\over 4}$ in. studs was found to be twice the capacity of the conventional 7/8 in. diameter studs. The testing conducted so far on the steel dovetail plate connector has demonstrated the viability of the new system. Its strength was found to depend upon the amount of reinforcement transverse to the plate connector. The dovetail connector does show merit as a possible standard composite connection method for all sizes of steel girder bridges. Design criteria and procedures for the new connection systems are presented.
Subject Area
Civil engineering
Recommended Citation
Kakish, Hussam Falk, "Composite action in bridge I-girder systems" (1997). ETD collection for University of Nebraska-Lincoln. AAI9736937.
https://digitalcommons.unl.edu/dissertations/AAI9736937