Experimental study on axial tension behavior of composite deck system composed of steel plate and steel fiber reinforced concrete

Aiming at resolving the problem of the poor crack resistance performance of common concrete bridge deck which is used in plate and truss composite girder bridges, composite bridge deck system composed of steel plate and steel fiber reinforced concrete is proposed. In order to investigate the axial tension behavior and crack resistance performance of this composite bridge deck, axial tensile tests were conducted on three types of bridge deck, including steel fiber reinforced concrete slab, steel plate-steel fiber reinforced concrete composite slab and orthotropic steel bridge deck-steel fiber reinforced concrete composite slab. The initial crack load, axial tensile load-maximum crack width curves of the steel fiber reinforced concrete, axial tensile load-axial deformation and the load carrying capacity of the slab were measured. The experimental results show that the steel fiber reinforced concrete slab is full of numerous tiny cracks which is totally different from common concrete. In addition, the failure mode of steel fiber reinforced concrete slab under axial tension is the fracture of longitudinal reinforcement at the connection, while it is the yielding of steel plate for composite slabs. The tensile behaviors of three new types slabs are different in serviceability limit state. The trend is the larger area of steel plate, the better the tension behavior of the composite slab. And the load-carrying capacity of steel plate-steel fiber reinforced concrete composite slab and orthotropic steel bridge deck-steel fiber reinforced concrete composite slab are 4 times and 6.7 times of that of steel fiber reinforced concrete slab respectively when the tensile stress of longitudinal reinforcement is 100 MPa. © 2019, Editorial Office of Journal of Building Structures. All right reserved.