Shear Strength of Pre-Cast Prestressed Composite Beams with Discontinuous Connections Made of Cast-in-Place Shear Keys |
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Authors: | Flavia M S Judice Ibrahim A E M Shehata Lidia C D Shehata |
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Affiliation: | (1) The Federal Fluminense University, Rio de Janeiro, Brazil;(2) COPPE - The Federal University of Rio de Janeiro, Rio de Janeiro, Brazil;(3) The Federal Fluminense University and COPPE, Rio de Janeiro, Brazil |
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Abstract: | This work investigates the horizontal and web shear resistance of continuous and discontinuous slab-web connections in pre-cast
pre-tensioned bridge systems. The beams were full scale pre-cast pre-tensioned girders and the slabs were made of ordinary
reinforced concrete either cast in place, for continuous connections, or pre-cast slabs with holes spaced at 312.5 mm to be
set in place, for discontinuous connections. The main variables were the connection type (continuous or discontinuous) and
the ratio of the connection steel.
From the test results and the numerical analysis performed, a modified stress field for the inclined compressive strut in
the truss model is proposed for continuous and discontinuous slab-web connections. The analytical results obtained with the
proposed modified stress field in the truss model compared well with the tests results. Design procedures for these types
of elements are also discussed. |
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