GFRP-混凝土组合桥面的多尺度分析模型研究

Analysis of GFRP-concrete Composite Bridge Deck Using a Multi-scale Modeling

文章提出了一种新型GFRP-混凝土组合桥面,它由双层GFRP板和现浇混凝土组成。为了分析桥面板的力学性能,建立了考虑T形肋局部构造的多尺度有限元分析模型。利用约束方程,将实体单元与壳单元进行了节点自由度耦合连接。同时,建立了组合桥面的实体单元和壳单元有限元分析模型,并与多尺度有限元分析模型比较了应力和跨中挠度。分析结果表明,多尺度有限元分析模型能有效地模拟组合桥面的受力特性,准确反映GFRP板与混凝土交结点处的局部应力,减少了单元数量,显著地节省了计算时间。

This paper presented a new type of GFRP concrete composite bridge deck, which was composed of double GFRP slab and cast-in-place concrete. In order to analyze the mechanical properties of bridge deck, a multi-scale finite element analysis model considering the local structure of T-shaped rib was established. The joint degrees of freedom of solid element and shell element were coupled by using constraint equation. At the same time, the solid element and shell element finite element analysis models of composite bridge deck were established, and the stress and mid-span deflection were compared with multi-scale finite element analysis model. The results showed that the multi-scale finite element analysis model can effectively simulate the mechanical characteristics of composite bridge deck, accurately reflect the local stress at the intersection point of GFRP slab and concrete, reduce the number of elements and significantly save the calculation time.