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International Journal of Civil Engineering

, Volume 17, Issue 3, pp 361–376 | Cite as

Study on Mechanical Behavior of Integrated Multi-cell Concrete-filled Steel Tubular Stub Columns Under Concentric Compression

  • Hua Song
  • Jiepeng Liu
  • Yuanlong YangEmail author
  • Y. Frank Chen
Research paper
  • 17 Downloads

Abstract

11 integrated multi-cell concrete-filled steel tubular (CFST) stub columns were tested under concentric compression. The key factors of width-to-thickness ratio (D/t) of steel plates in column limb and prism compressive strength of concrete (fck) were considered and their influence on failure mode, bearing capacity, and ductility of the columns were investigated. The experimental results show that: (1) the constraint effect for concrete provided by the multi-cell steel tube cannot be overlooked; (2) the ductility decreases with the increasing ratio D/t of the connecting steel plates for the multi columns; and (3) the bearing capacity increases, while the ductility decreases, with the increasing fck. The finite element (FE) method was used to simulate the integrated multi-cell CFST stub columns and to verify the test results. A parametric analysis using the FE method was carried out to study the effects of the steel ratio α, steel yield strength fy, concrete strength fck, and D/t on the stiffness, bearing capacity, and ductility of the columns. Furthermore, the measured bearing capacity values were compared to those estimated by the Chinese, European, and American design codes. This study shows that the bearing capacity of integrated multi-cell CFST stub column can be reasonably predicted by the design method specified in GB 50936-2014 or EC4-2004 code.

Keywords

Integrated column Concrete-filled steel tubular (CFST) stub column Multi-cell Bearing capacity Ductility 

Notes

Acknowledgements

This research is supported by the National Key Research and Development Program of China (Grant Nos. 2016YFC0701201 and 2017YFC0703805), Research and Development Project of Ministry of Housing and Urban–Rural Development (Grant No. 2014-K2-010), and the Fundamental Research Funds for the Central Universities (Grant Nos. 106112017CDJXY200010 and 106112014CDJZR200001), to which the authors are very grateful.

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Copyright information

© Iran University of Science and Technology 2018

Authors and Affiliations

  1. 1.Key Laboratory of New Technology for Construction of Cities in Mountain Area, Ministry of EducationChongqing UniversityChongqingPeople’s Republic of China
  2. 2.Shenzhen Municipal Design and Research Institute Co., Ltd.ShenzhenPeople’s Republic of China
  3. 3.School of Civil EngineeringChongqing UniversityChongqingPeople’s Republic of China

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