Wang Bo, Bachtiar Erik Valentine, Yan Libo, Kasal Bohumil, Fiore Vincenzo
Department of Organic and Wood-Based Construction Materials, Technische Universität Braunschweig, Hopfengarten 20, 38102 Braunschweig, Germany.
Center for Light and Environmentally-friendly Structures, Fraunhofer Wilhelm-Klauditz-Institut, Bienroder Weg 54E, 38108 Braunschweig, Germany.
Polymers (Basel). 2019 Jul 29;11(8):1255. doi: 10.3390/polym11081255.
In this study, the structural behavior of small-scale wood beams externally strengthened with various fiber strengthened polymer (FRP) composites (i.e., flax FRP (FFRP), basalt FRP (BFRP), E-glass FRP ("E" stands for electrical resistance, GFRP) and their hybrid FRP composites (HFRP) with different fiber configurations) were investigated. FRP strengthened wood specimens were tested under bending and the effects of different fiber materials, thicknesses and the layer arrangements of the FRP on the flexural behavior of strengthened wood beams were discussed. The beams strengthened with flax FRP showed a higher flexural loading capacity in comparison to the beams with basalt FRP. Flax FRP provided a comparable enhancement in the maximum load with beams strengthened with glass FRP at the same number of FRP layers. In addition, all the hybrid FRPs (i.e., a combination of flax, basalt and E-glass FRP) in this study exhibited no significant enhancement in load carrying capacity but larger maximum deflection than the single type of FRP composite. It was also found that the failure modes of FRP strengthened beams changed from tensile failure to FRP debonding as their maximum bending load increased.
在本研究中，对用各种纤维增强聚合物（FRP）复合材料（即亚麻纤维增强塑料（FFRP）、玄武岩纤维增强塑料（BFRP）、E玻璃纤维增强塑料（“E”代表电阻，即GFRP））及其具有不同纤维配置的混合FRP复合材料（HFRP）进行外部增强的小尺寸木梁的结构性能进行了研究。对FRP增强木试件进行了弯曲试验，并讨论了不同纤维材料、厚度以及FRP的层排列对增强木梁弯曲性能的影响。与玄武岩纤维增强塑料梁相比，亚麻纤维增强塑料增强的梁具有更高的抗弯承载能力。在相同层数的FRP情况下，亚麻纤维增强塑料在最大荷载方面提供了与玻璃纤维增强塑料增强梁相当的增强效果。此外，本研究中的所有混合FRP（即亚麻、玄武岩和E玻璃纤维增强塑料的组合）在承载能力方面没有显著增强，但比单一类型的FRP复合材料具有更大的最大挠度。还发现，随着FRP增强梁的最大弯曲荷载增加，其破坏模式从拉伸破坏转变为FRP脱粘。
