GFRP/UHPFRC Composite Girder**

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The objective of the proposed research is to establish critical elements of knowledge that will enable the development of a novel composite girder suitable for bridge construction. The girder will be constructed of glass fibre reinforced polymer (GFRP) and ultra high-performance fibre reinforced concrete (UHPFRC). It will have a single-cell box cross-section with top flange extending beyond the webs, and will consist of a lower GFRP component with "U" section and an upper horizontal plate. Construction of a given girder has the following main steps: (1) place a thin layer of UHPFRC in the bottom of the "U" section, thus creating a composite bottom flange, (2) bond the upper plate to the "U" section using adhesive, and (3) place a thin layer of UHPFRC on the upper plate, thus creating a composite top flange. The transfer of shear between GFRP and UHPFRC is critical to the structural performance of the girder. It will be accomplished using a texture formed into the surface of the GRFP components as well as an array of protrusions reinforced with glass fibre. The research focuses on validating the performance of this shear connection under static load and in fatigue. The behaviour will be studied using a scale model girder constructed of the two materials and using the proposed detail for transferring shear. The test program will include static load tests at serviceability limit state, free vibration tests, fatigue tests, and tests of ultimate capacity of the girder in bending and shear.