Mechanical performances of stiffened and reinforced concrete-filled steel tubes under axial compression
Mechanical performances of stiffened and reinforced concrete-filled steel tubes under axial compression
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DOI：
10.1016/j.marstruc.2018.12.008
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发表时间：
2019-05-01
影响因子：
3.9
通讯作者：
Shehab, Bashar A.
中科院分区：
文献类型：
--
作者：
Hasan, Hussein Ghanim;Ekmekyapar, Talha;Shehab, Bashar A.
钢管混凝土柱联合收割机结合了钢的高延性和抗拉强度与混凝土的高刚度和抗压强度的优点。它可以用于海洋结构。本文研究了钢管混凝土柱轴心受压时配筋加固的力学性能。对22根钢管混凝土柱进行了一系列的试验，采用两种不同的D/t比和不同的RB模式作为参数。此外，使用不同直径和数量的RB。RB要么焊接在钢管的内表面上，要么嵌入混凝土中作为钢筋混凝土。各种模式被用来使一个更好的理解加强钢管混凝土柱的性能。分析了试件的压缩荷载-端部短缩曲线、破坏模式、强度指标和残馀筋贡献率。对普通钢管混凝土柱（EC 4、AISC、Han、Yu和Liang）的设计方法进行了修改，并根据试验结果进行了评估，以跟踪适合设计目的的配方。理论分析结果表明，某些方法的分析公式对钢管混凝土柱的分析是可以接受的。
Concrete-Filled Steel Tube (CFST) columns combine the benefits of high ductility and tensile strength of steel with high stiffness and compressive strength of concrete. It can be used in marine structures. This paper presents the mechanical performance of CFST columns strengthened by steel Reinforcing Bars (RBs) under axial compression. A series of experiments were carried out on 22 CFST columns using two different D/t ratios and different patterns of RBs as parameters. Furthermore, different diameters and numbers of RBs were utilized. The RBs were either welded on the internal surface of the steel tubes or embedded within concrete as a reinforced concrete. Various patterns were used to enable a better understanding of the strengthened CFST columns performance. Moreover, the compressive loading vs. end shortening curves, failure modes, strength index and RBs contribution ratio were analysed. The design methods of the ordinary CFST columns (EC4, AISC, Han, Yu, and Liang) were modified and assessed against the experimental results to trace the suitable formulation for design purposes. According to the theoretical results, the analytical formulations of certain methods are acceptable for the analysis of reinforced and stiffened CFST columns.