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Compressive behavior of hybrid double-skin tubular columns with a rib-stiffened steel inner tube

机译：肋骨加筋的混合双层皮管柱的压缩行为

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摘要

Hybrid fibre-reinforced polymer (FRP)-concrete-steel double-skin tubular columns (DSTCs) consist of an outer FRP tube and an inner steel tube, with the space inbetween filled with concrete. In hybrid DSTCs, the outward buckling of the steel inner tube is constrained by the surrounding concrete and the outer FRP tube, but its inward buckling is still possible. Existing research has shown that such inward buckling can become significant in noncircular hybrid DSTCs due to the non-uniform confinement, in hybrid DSTCs with a strong FRP tube due to the large axial deformation of the columns, and/or in hybrid DSTCs with a thin steel tube. In these cases, the stiffening of the inner steel tube is necessary to prevent or delay its inward buckling and to minimize its negative consequences to the column behavior. Against this background, a variation of hybrid DSTCs (hybrid R-DSTCs), in which the inner steel tube is stiffened by a number of vertical rib stiffeners, was recently developed at the University of Wollongong, Australia. This paper presents an experimental study on the axial compressive behavior of the new form of columns. The experimental program included a total of 12 R-DSTC specimens and two DSTC specimens for comparison, with the test variables being the number, thickness and width of rib stiffeners as well as the number of plies of fibres in the FRP tube. The test results confirmed that the additional rib stiffeners on the steel tube are effective in delaying the local buckling of the steel tube and in improving the performance of the columns. The test results also clarified the effects of the tested parameters of the rib stiffeners.
机译：混合纤维增强聚合物（FRP）-混凝土钢双层皮管柱（DSTC）由外部FRP管和内部钢管组成，两者之间的空间填充有混凝土。在混合DSTC中，钢制内管的向外屈曲受到周围的混凝土和FRP外部管的约束，但其向内屈曲仍然是可能的。现有研究表明，由于非均匀约束，这种向内屈曲在非圆形混合DSTC中，由于柱的轴向变形大而在具有坚固FRP管的混合DSTC中和/或在具有薄壁的混合DSTC中会非常明显。钢管。在这些情况下，必须对内钢管进行加固，以防止或延迟其向内弯曲，并最大程度降低其对立柱性能的负面影响。在这种背景下，澳大利亚卧龙岗大学最近开发了一种混合DSTC（混合R-DSTC），其中内钢管由许多垂直的肋骨加强筋加强。本文对新型柱的轴向压缩特性进行了实验研究。实验程序总共包括12个R-DSTC标本和两个DSTC标本进行比较，测试变量是肋骨加强筋的数量，厚度和宽度以及FRP管中纤维的层数。测试结果证实，钢管上附加的肋加强筋可有效延迟钢管的局部屈曲并改善柱的性能。测试结果还明确了肋加强筋的测试参数的影响。

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  • 来源
    《Composite Structures》 |2018年第11期|634-644|共11页
  • 作者

    Peng Kaidi; Yu Tao; Hadi Muhammad N. S.; Huang Le;

  • 作者单位

    Univ Wollongong, Fac Engn & Informat Sci, Sch Civil Min & Environm Engn, Wollongong, NSW 2522, Australia;

    Univ Wollongong, Fac Engn & Informat Sci, Sch Civil Min & Environm Engn, Wollongong, NSW 2522, Australia;

    Univ Wollongong, Fac Engn & Informat Sci, Sch Civil Min & Environm Engn, Wollongong, NSW 2522, Australia;

    Univ Wollongong, Fac Engn & Informat Sci, Sch Civil Min & Environm Engn, Wollongong, NSW 2522, Australia;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    FRP; Tubular columns; Steel tube; Local buckling; Rib stiffener;

    机译：玻璃钢;管状柱;钢管;局部屈曲;肋骨加劲肋;

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