GFRP/UHPFRC Composite Girder**

拟议研究的目标是建立关键的知识要素，使开发适合桥梁建设的新型组合梁成为可能。主梁将由玻璃纤维增强聚合物(GFRP)和超高性能纤维混凝土(UHPFRC)建造。它将有一个单室箱形横截面，顶部翼缘延伸到腹板之外，并将由一个下部的“U”形截面的GFRP组件和一个上部的水平板组成。给定梁的施工主要有以下步骤：(1)在“U”型截面的底部放置一层超高性能混凝土，从而形成一个组合下翼缘；(2)使用粘结剂将上板粘结到“U”型截面上；(3)在上板上放置一层超高性能混凝土，从而形成一个组合的上翼缘。GFRP与UHPFRC之间的剪力传递对梁的结构性能至关重要。它将使用形成在GRFP组件表面的纹理以及用玻璃纤维增强的一系列突起来完成。研究的重点是验证这种剪力节点在静载和疲劳状态下的性能。将使用由这两种材料建造的比例模型梁来研究其性能，并使用所建议的细节来传递剪力。试验计划将包括正常使用极限状态下的静载试验、自由振动试验、疲劳试验以及梁的弯曲和剪切极限能力试验。

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.