RESEARCH ARTICLE
Study on Cross-shaped Concrete Filled Steel Tubular Stub Columns Subjected to Axial Compression: Experiments and Design Method
Chen Qiguang1, Cai Jian1, 2, Zuo ZhiLiang1, *, Huang Jinxuan1, Wei Jieying1
Article Information
Identifiers and Pagination:
Year: 2017Volume: 11
First Page: 1
Last Page: 13
Publisher ID: TOCIEJ-11-1
DOI: 10.2174/1874149501711010001
Article History:
Received Date: 21/01/2016Revision Received Date: 04/10/2016
Acceptance Date: 07/10/2016
Electronic publication date: 23/01/2017
Collection year: 2017
open-access license: This is an open access article licensed under the terms of the Creative Commons Attribution-Non-Commercial 4.0 International Public License (CC BY-NC 4.0) (https://creativecommons.org/licenses/by-nc/4.0/legalcode), which permits unrestricted, non-commercial use, distribution and reproduction in any medium, provided the work is properly cited.
Abstract
Despite its wide application prospect, researches on the cross-shaped concrete filled steel tubular (CFT) columns are scarce, and no design method can be used. This paper concerns with the axial load behavior of cross-shaped CFT stub columns. Five specimens were tested to examine the influences of three parameters on the characteristics of failure, the bearing capacity and deformability. The parameters include the width-thickness ratios of steel plates, the yield strengths of steel and the sectional dimensions. Experimental results demonstrate that the global outward bulge of steel tube near the concave corners is significant, so that the stresses on the steel tube distribute unevenly and the confinement effects on the concrete are inferior to the rectangular CFT columns. By decreasing the width-thickness ratio of each steel plate, the global outward bulge near the concave corners was smaller, but the ductility could be improved only when it decreased by 2.08 times. By increasing the yield strength of steel to 1.47 times, the bearing capacity and deformation were inversely smaller, but the ductility was increased. By increasing the length-width ratio of each leg to 2.25 times, the global outward bulge was increased and local buckling occurred earlier. Then the application scopes for evaluating the maximum strength of specimens by the methods in design codes are provided. A new method is also proposed by considering the confinement effects of concrete and the strength loss of steel tube. The results predicted by the proposed method show good agreement with the experimental ones.
