Abstract
Jo, Byung Wan Kim, Cheol HwanAbstractIn the steel-free bridge concrete deck, steel straps are genera lly used instead of conventional steel rebar while laterally restrained in the perpendicular direction to the traf fic in order fir the arching effect of concrete deck. In this paper, the minimum amount of FRP bar is to be suggested based o n the structural strength, crack propagation, stress level and others in order to control cracks. As a result of lab oratory tests, the structural strength of deck with 0.15 percentage of steel strap showed improved structural strength i ncluding ductility. The long-term serviceability of steel strap deck with FRP bar proved to satisfy the requirements and to be structurally stable while showing the amount of crack and residual vertical displacement within the allowable l imits after two million cyclic loadings. The structural failure of RC bridge deck is generally caused from the punching shear r ather than moment. Therefore, the ultimate load at failure could be estimated using the shear strength formula in the two-way slab based on ACI and AASHTO criteria. However the design criteria tend to underestimate the shear str ength since they don’t consider the arching effects and nonlinear fracture in bridge deck with lateral confinement. In this paper, an equation to estimate the punching shear strength of steel strap deck is to be developed considering the actual failure geometries and effect of lateral confinement by strap while the results are verified in accordance with labo ratory tests.Keywords: Concrete bridge slab, Steel free, Steel strap, FRP bar, Punchin g shear
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