This paper presents experimental and numerical investigations about the transverse bending and in-plane shear behaviours of pultruded bridge deck panels made of E-glass fiber reinforced polymer (GFRP). The analysed panels have a wide multicellular thin-walled cross-section, with panel-to-panel vertical interlocks (snap-fit) at the lateral edges. The study aimed at understanding and quantifying the structural contribution of the deck panels, in terms of their transverse stiffness and strength properties, w. r.t the load transmission to the lower support girder system along its longitudinal axis (bridge's main axis). Particular focus was given to the influence of the panel-to-panel joining system on the transverse performance of the deck when compared to a continuous panel (i.e. without snap-fit). The effects of complementing the snap-fit connection with two different structural adhesives was also investigated. For all deck configurations tested, the structural response in bending and shear exhibited high post-cracking strength and pseudo-ductility (above 100% and 200% respectively), as a consequence of the redundancy provided by the multi-cellular section. Compared to a continuous deck, the mechanical snap-fit exhibited very high deformability; however, when combined with adhesive bonding, it behaved fairly rigidly. In general, failure occurred in a progressive way (crack initiation and propagation) and the ultimate capacity was governed by the web-flange junctions. The numerical simulations, which were performed with continuum shell finite element (FE) models using Hashin-based damage analysis, provided useful insights about the failure mechanisms. Both bending and in-plane shear responses were simulated with good accuracy, with matrix tension failure governing the load capacity. The low value of the estimated in-plane shear modulus was consistent with the very low interaction degree (3–4%) that was assessed between the panels' flanges under bending, thus highlighting the high flexibility of this bridge deck's multicellular core when subjected to transverse loading.

本文介绍了由E-玻璃纤维增​​强聚合物（GFRP）制成的拉挤桥面板的横向弯曲和面内剪切特性的实验和数值研究。所分析的面板具有宽的多细胞薄壁横截面，在侧边缘具有面板对面板的垂直互锁（卡扣配合）。旨在了解和量化桥面面板的结构贡献，在他们的横向刚度和强度性能，方面的研究WRT载荷沿着其纵轴（桥的主轴线）传递到下部支撑梁系统。与连续面板相比，面板间连接系统对甲板横向性能的影响尤为突出（即没有按扣配合）。还研究了用两种不同的结构粘合剂补充卡扣配合连接的效果。对于所有测试的甲板结构，由于多单元截面提供的冗余性，弯曲和剪切时的结构响应表现出较高的破裂后强度和拟延性（分别高于100％和200％）。与连续甲板相比，机械搭扣具有很高的变形能力。但是，当与胶粘剂结合使用时，它的刚性相当强。通常，失效以渐进方式发生（裂纹萌生和扩展），极限承载力由腹板-法兰连接处控制。使用基于Hashin的损伤分析对连续壳有限元（FE）模型进行的数值模拟，提供了有关故障机制的有用见解。弯曲和平面内剪切响应都具有良好的精度，基体张力失效决定了承载能力。估计的面内剪切模量的低值与弯曲下面板的法兰之间评估的极低的相互作用度（3-4％）相一致，从而突出了该桥面板的多单元芯在承受荷载时具有很高的灵活性。横向载荷。