Flexural Behavior And Design Method Of GFRP-concrete Composite Deck With Shear Connector

Shear connector is the important structural measures to ensure that the hollow-box bridge deck at the bottom and the upper concrete as a whole to work together.In this paper, we propose GFRP hollow-box bridge deck as perpetual formwork at the bottom of composite deck. Adding a GFRP rib at the bridge deck as shear connectors. The hollow-box bridge deck by forming a pultrusion process to guarantee the integral forced status. Reference steel-concrete composite structure design principle, the GFRP hollow box-shaped bridge deck sustain tension at the bottom of composite structure, the surface layer of concrete pouring concrete in the compressive zone is formed GFRP-concrete composite deck. The structure can give full play the advantages that GFRP have the good tensile properties and concrete have the good compression, and the composite structure can get larger structural rigidity to avoid deck appears local compression damage in traffic load and GFRP can be used as a perpetual formwork to simplifies the construction.1?In this paper, Designing four different shear connector detail, T-shape shear connector opening-200 bridge deck, T-shape shear connector opening-100 bridge deck, T-shape shear connector bridge deck and rectangle-shape shear connector opening-100 bridge deck, are designed to study the flexural behavior of GFRP hollow-box bridge deck in construction stage. The load-deflection curves and load-strain curves, are obtained by contrast experiments. Results show that: under construction loads GFRP formwork in elastic state, the deflection at the center span and the tensile stresses at the bottom of bridge deck far less than specification, so the bridge deck can apply to bridge construction. According to the specification of all the specimens as a construction template stiffness, strength theoretical and experimental results are in good agreement.2? Four specimens with different shear connectors, T-shape shear connector opening-200 composite deck,T-shape shear connector opening-100 composite deck,T-shape shear connector composite deck and rectangle-shape shear connector opening-100 composite deck, are designed to study the influences of shear connectors on flexural behavior of hybrid GFRP-concrete bridge deck. The failure patterns, load-strain curves of the top of shear connectors and concrete as well as Load-slide displacement curves, are obtained by contrast experiments. The damage mechanisms, deformation capacities and crack development rules are analysis. Results show that T-shaped aperture combination plate before reaching maximum load overall good combination plate slippage less negligible strain along the section height in line with plane assumption and not a T-shaped opening large combination plate slippage, during theoretical studies should be considered when computing the slip on a combination plate. Combination of experience in the whole plate to force the process into three stages: the case of elastic stage, elastoplastic stage, the residual carrier phase, although in force during the construction process due to defects in composite slab plant damage but the combination of local presence throughout the force plate the process showed excellent mechanical properties and deformation characteristics, it can be used as bridge decks in bridge engineering.3?In this paper, the four computational assumption is presented to establish the flexural strength of the T-shape shear connectors composite deck. By comparing the test results with the experiment value, The results show that: the proposed method on predicting the ultimate load capacity of GFRP-concrete composite deck is reasonable, the predicted value is less than the experiment value, So the formulate can apply to actual bridge construction.4?In this paper, GFRP-concrete composite deck considering the effect of slid and without considering the slip between the FRP and concrete interface are proposed. By comparing the experiment results with the predicted, the results show that:Deflection test the actual test are less than the theoretical value of the deflection calculation method proposed in this paper, this paper shows small deflection calculation method stiffness than the actual combination plate stiffness, so this paper GFRP- concrete composite deflection plate design with shear keys calculation method has certain security can be applied in practical engineering bridge design.