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Advances in Materials Science and Engineering
Volume 2017, Article ID 8410895, 9 pages
https://doi.org/10.1155/2017/8410895
Research Article

Experimental Study on Ultrahigh Strength Concrete Filled Steel Tube Short Columns under Axial Load

1School of Architecture and Civil Engineering, Xihua University, Chengdu 610039, China
2Sichuan Provincial Transport Department Highway Planning, Survey, Design and Research Institute, Chengdu 610041, China

Correspondence should be addressed to Hongyuan Tang; moc.361@uesyhgnat

Received 8 February 2017; Revised 22 June 2017; Accepted 6 July 2017; Published 6 August 2017

Academic Editor: Bernd-Arno Behrens

Copyright © 2017 Xiaojun Zhou et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Based on the project of Modaoxi Bridge, an experimental study on the compressive behavior of ultrahigh strength concrete filled steel tube (UHSCFST) short column was conducted. A total of 9 UHSCFST specimens were tested, and the cube strength () of the core concrete reached 115.4 MPa. Main parameters were the confining factor (, 0.919, and 1.015), steel ratio (%, 20.02%, and 21.98%), and steel strength ( = 349 MPa, 352 MPa, and 427 MPa). The axially loading test results showed that the visible damage of steel tube occurred under the ultimate load. The higher the confining effect, the less the damage features. And all specimens basically presented a drum-type failure mode. The confining effect of steel tube effectively changed the brittle failure mode of ultrahigh strength concrete (UHSC) and tremendously improved the load bearing capacity and ductility of specimens. Moreover, the higher the steel ratio and steel strength of the specimens, the stronger the confining effect. Meanwhile the excellent mechanical properties will be obtained. Also it is recommended that the UHSCFST prefers Q345 or above strength steel tube to ensure sufficient ductility, and the steel ratio should be more than 20%. Furthermore, the confining effect of steel tubes can improve the ultimate bearing capacity of the ultrahigh strength CFST short columns.