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Performance of a lightweight GFRP composite bridge deck in positive and negative bending regions

机译：轻质GFRP复合材料桥面在正弯和负弯区域的性能

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摘要

This paper presents results from an experimental and analytical study of a newly developed lightweight composite bridge deck system composed of pultruded trapezoidal GFRP tubes and outer wrap. Panels with different grout materials and grouting patterns were evaluated and compared in terms of flexural stiffness. Two-span tests were performed on non-grouted and epoxy grouted panels to simulate a multi-girder bridge configuration and to evaluate their structural behavior in both positive and negative bending regions. Test results showed that the epoxy grouted panel meets the AASHTO deflection requirement (L/800) and performed well under service loads. An analytical model was developed to predict the load-deflection response of grouted and non-grouted panels at incremental load steps, even beyond the uncracked stage. The proposed model shows that shear deformation must be considered in order to accurately predict the behavior of GFRP panels in multi-girder bridges.
机译：本文介绍了对由拉挤梯形GFRP管和外包裹层组成的新型轻型复合桥面板系统进行的实验和分析研究的结果。对具有不同灌浆材料和灌浆模式的面板进行了评估，并根据抗弯刚度进行了比较。在非灌浆和环氧灌浆板上进行了两次跨度测试，以模拟多梁桥构型并评估其在正弯和负弯区域的结构性能。测试结果表明，环氧灌浆板符合AASHTO挠度要求（L / 800），在使用载荷下表现良好。开发了一个分析模型来预测灌浆板和非灌浆板在增加的载荷阶跃下（甚至超过未破裂阶段）的载荷-挠度响应。所提出的模型表明，必须考虑剪切变形才能准确预测多梁桥中GFRP面板的行为。

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