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首页> 美国卫生研究院文献>Materials >Flexural Behavior of Double-Skin Steel Tube Beams Filled with Fiber-Reinforced Cementitious Composite and Strengthened with CFRP Sheets
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Flexural Behavior of Double-Skin Steel Tube Beams Filled with Fiber-Reinforced Cementitious Composite and Strengthened with CFRP Sheets

机译：用CFRP板材加固双皮肤钢管梁的弯曲行为用CFRP薄片加固

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摘要

The concrete-filled double skin steel tube (CFDST) is a more viable option compared to a concrete-filled steel tube (CFST) due to consisting a hollow section, while degradation is enhanced simply by using carbon fiber-reinforced polymer (CFRP). Hence, the stabilization of a concrete’s ductile strength needs high- performance fiber-reinforced cementitious conmposite. This study investigates the behavior of high-performance fiber-reinforced cementitious composite-filled double-skin steel tube (HPCFDST) beams strengthened longitudinally with various layers, lengths, and configurtion of CFRP sheets. The findings showed that, with increased CFRP layers, the moment capacity and flexural stiffness values of the retrofitted HPCFDST beams have significantly improved. For an instant, the moment capacity of HPCFDST beams improved by approximately 28.5% and 32.6% when they were wrapped partially along 100% with two and three layers, respectively, compared to the control beam. Moreover, the moment capacity of the HPCFDST beam using two partial layers of CFRP along 75% of its sufficient length was closed to the findings of the beam with two full CFRP layers. For energy absorption, the results showed a vast disparity. Only the two layers with a 100% full length and partial wrapping showed increasing performance over the control. Furthermore, the typical failure mode of HPCFDST beams was observed to be local buckling at the top surface near the point of loading and CFRP rapture at the bottom of effect length.
机译：与由中空部分组成的混凝土钢管（CFST）相比，混凝土双层钢管（CFDST）是一种更可行的选择，而通过使用碳纤维增强聚合物（CFRP），仅通过碳纤维增强的聚合物增强降解。因此，混凝土延性强度的稳定需要高性能纤维增强水泥孔隙化。本研究调查了高性能纤维增强水泥复合材料填充双层钢管（HPCFDST）梁的行为纵向强化CFRP板材的各个层，长度和配置。结果表明，随着CFRP层的增加，改造的HPCFDST梁的力矩和弯曲刚度值显着提高。对于瞬间，与控制梁相比，当分别用两个和三层部分沿100％包裹时，HPCFDST光束的力矩容量约为28.5％和32.6％。此外，HPCFDST光束使用两层CFRP沿着其足够长度的75％的部分层的力矩容量与两个完整的CFRP层的光束的发现关闭。对于能量吸收，结果表明了巨大的差异。只有100％全长和部分包装的两层才会对控制的性能提高。此外，观察到HPCFDST梁的典型故障模式在靠近效果长度的加载点和CFRP Rapture附近的顶表面处局部屈曲。

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