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Materials 2016, 9(2), 86; doi:10.3390/ma9020086

Uniaxial Compressive Constitutive Relationship of Concrete Confined by Special-Shaped Steel Tube Coupled with Multiple Cavities

College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China
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Author to whom correspondence should be addressed.
Academic Editor: Jorge de Brito
Received: 21 November 2015 / Revised: 19 January 2016 / Accepted: 19 January 2016 / Published: 29 January 2016
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Abstract

A method is presented to predict the complete stress-strain curves of concrete subjected to triaxial stresses, which were caused by axial load and lateral force. The stress can be induced due to the confinement action inside a special-shaped steel tube having multiple cavities. The existing reinforced confined concrete formulas have been improved to determine the confinement action. The influence of cross-sectional shape, of cavity construction, of stiffening ribs and of reinforcement in cavities has been considered in the model. The parameters of the model are determined on the basis of experimental results of an axial compression test for two different kinds of special-shaped concrete filled steel tube (CFT) columns with multiple cavities. The complete load-strain curves of the special-shaped CFT columns are estimated. The predicted concrete strength and the post-peak behavior are found to show good agreement within the accepted limits, compared with the experimental results. In addition, the parameters of proposed model are taken from two kinds of totally different CFT columns, so that it can be concluded that this model is also applicable to concrete confined by other special-shaped steel tubes. View Full-Text
Keywords: constitutive relationship; confined concrete; special-shaped cross-section; concrete filled steel tube (CFT); multiple cavities constitutive relationship; confined concrete; special-shaped cross-section; concrete filled steel tube (CFT); multiple cavities
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. (CC BY 4.0).

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MDPI and ACS Style

Wu, H.; Cao, W.; Qiao, Q.; Dong, H. Uniaxial Compressive Constitutive Relationship of Concrete Confined by Special-Shaped Steel Tube Coupled with Multiple Cavities. Materials 2016, 9, 86.

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