Abstract: Based on the glass fiber reinforced polymer (GFRP),which has the advantages of light weight, high strength, corrosion resistance, a new type of composite bridge deck was puts forward. GFRP plates were sticked on the surface of steel deck plate and they were took as orthotropic steel bridge deck waterproofing and anti-corrosion layer, which plays a critical role of enhancing the stiffness of steel plate. On the completion of a test for the material performance of composite bridge deck, the four-point bending test for the composite bridge deck under the positive and negative bending moment was implemented. The load-deformation curve and load-strain curve of the specimens were obtained from the test. The stiffness, the mid-span deformation and stress calculation formulation of steel plate-GFRP composite bridge deck were deduced according to conversion section theory. In addition, making a comparison between theoretical values and the experimental values, deformation and stress analysis of orthotropic steel plate by using finite element software under four pavement models, it is concluded that GFRP plate sticked on the surface of steel plate can effectively improve bearing capacity and stiffness of steel plates, reduce steel surface stress and the risk of cracking. Theoretical value of steel plate-GFRP composite bridge deck bending performance is consistent with the experimental value well.

Key words: GFRP plate, composite bridge deck, bending test, conversion section theory