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Design and Analysis of Unretrofitted and Retrofitted Glulam Beams and Columns under Blast Loading

机译:爆炸荷载作用下未改建和改建的胶合梁和柱的设计与分析

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The findings of a comprehensive study involving the static and dynamic investigation of seventy unretro fitted and FRP retrofitted glulam structural elements are presented in this paper. Key observations made in the experimental program regarding material properties, effect of combined axial and out-of-plane blast loading, and strengthening strategies using FRP are used as foundation for design recommendations. Based on the experimental results, unretrofitted glulam beams and columns were shown to have no significant post-peak resistance and thus it is recommended that such members be modeled using a linear flexural resistance curve with a ductility ratio of unity. A dynamic increase factor was found to only be present in beams with no continuous or closely aligned finger-joints. In cases where the finger-joint distribution is not known, a DIF of unity is recommended. Fibre-reinforced polymers (FRP) were shown to only provide significant post-peak resistance when bidirectional fabrics were used as confinement.
机译:本文介绍了一项综合研究的结果,该研究涉及静态和动态调查的70种未改装和FRP改装的胶合胶合层结构元件。实验程序中有关材料特性,轴向和平面外爆炸载荷组合的影响以及使用FRP的加固策略的主要观察结果被用作设计建议的基础。根据实验结果,未改装的胶合木横梁和柱子显示没有明显的峰后阻力,因此建议使用延性比为1的线性挠曲阻力曲线对此类构件进行建模。发现动态增加因子仅存在于没有连续或紧密对齐的手指关节的光束中。如果手指关节的分布未知,建议使用统一的DIF。当使用双向织物作为隔离物时,纤维增强聚合物(FRP)仅显示出显着的峰后抗性。

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