Behavior of partial-length stiffened and full-length stiffened CFDST columns under axial load

IF 1.4 Q2 ENGINEERING, MULTIDISCIPLINARY

World Journal of Engineering Pub Date : 2023-03-02 DOI:10.1108/wje-09-2022-0370

A. Hassan, J. A. Bhat

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引用次数: 0

Abstract

Purpose Concrete-filled double skin tube (CFDST) columns are considered one of the most effective steel-concrete composite sections owing to the higher load carrying capacity as compared to its counterpart concrete-filled tube (CFT) columns. This paper aims to numerically investigate the performance of axially loaded, circular CFDST short columns, with the innovative strengthening technique of providing stiffeners in outer tubes. Circular steel hollow sections have been adopted for inner as well as outer tubes, while varying the length of rectangular steel stiffeners, fixed inside the outer tubes only, to check the effect of stiffeners in partially and full-length stiffened CFDST columns. Design/methodology/approach The behaviour of these CFDST columns is investigated numerically by using a verified finite element analysis (FEA) model from the ABAQUS. The behaviour of 20-unstiffened, 80-partially stiffened and 20-full-length stiffened CFDST columns is studied, while varying the strength of steel (fyo = 250–750 MPa) and concrete (30–90 MPa). Findings The FEA results are verified by comparing them with the previous test results. FEA study has exhibited that, there is a 7%–25% and 39%–49% increase in peak-loads in partially stiffened and full-length stiffened CFDST columns, respectively, compared to unstiffened CFDST columns. Originality/value Enhanced strength has been observed in partially stiffened and full-length stiffened CFDST columns as compared to unstiffened CFDST columns. Also, a significant effect of strength of concrete has not been observed as compared to the strength of steel.

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部分加筋和全长加筋CFDST柱在轴向荷载作用下的性能

目的双层皮管混凝土（CFDST）柱与钢管混凝土（CFT）柱相比具有更高的承载能力，被认为是最有效的钢-混凝土组合截面之一。本文旨在通过在外管中设置加劲肋的创新加固技术，对轴向加载的圆形CFDST短柱的性能进行数值研究。内外管均采用圆形钢空心截面，同时改变仅固定在外管内部的矩形钢加劲肋的长度，以检查部分和全长加肋CFDST柱中加劲肋的影响。设计/方法/方法通过使用ABAQUS的验证有限元分析（FEA）模型，对这些CFDST柱的性能进行了数值研究。研究了20根未加肋、80根部分加肋和20根全长加肋CFDST柱的性能，同时改变了钢的强度（fyo=250–750 MPa）和混凝土（30–90 通过将有限元分析结果与之前的测试结果进行比较，验证了有限元分析的结果。有限元分析研究表明，与未加肋的CFDST柱相比，部分加肋和全长加肋的CFRST柱的峰值荷载分别增加了7%-25%和39%-49%。独创性/价值与未加肋的CFDST柱相比，在部分加肋和全长加肋的CFRST柱中观察到强度增强。此外，与钢的强度相比，还没有观察到混凝土强度的显著影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

World Journal of Engineering ENGINEERING, MULTIDISCIPLINARY-

CiteScore

4.20

自引率

10.50%

发文量

期刊介绍： The main focus of the World Journal of Engineering (WJE) is on, but not limited to; Civil Engineering, Material and Mechanical Engineering, Electrical and Electronic Engineering, Geotechnical and Mining Engineering, Nanoengineering and Nanoscience The journal bridges the gap between materials science and materials engineering, and between nano-engineering and nano-science. A distinguished editorial board assists the Editor-in-Chief, Professor Sun. All papers undergo a double-blind peer review process. For a full list of the journal''s esteemed review board, please see below.