Effect of High Performance Concrete Mixture on Behavior of Passive and Active Confined CFT

AUTHOR(S):

Morteza Naghipour, Marzieh Nemati, Javad Jalali, Mahdi Nematzadeh

TITLE

Effect of High Performance Concrete Mixture on Behavior of Passive and Active Confined CFT

ABSTRACT

Easy mixing and placement of concrete and ultimate performance of structural member regard to its cost is one of the important factor in concrete structures. This paper offers an innovative solution to enhance the workability of the core concrete of concrete filled steel tube (CFST) without using additives. This solution can be used for both passive and active CFTs. This study was performed in two phases. In the first phase, high performance concrete (HPC) mixture was introduced and compressive strength of this type of concrete was measured in order to investigate the efficiency of proposed mixture. In the second phase, the active and passive CFTs, with both conventional concrete (CC) and HPC mixtures were built and their flexural behavior was studied. The flexural capacity, energy absorption, flexibility and failure mode of the confined specimens as well as cracking pattern of the concrete core at the failure point are evaluated in this study. Obtained results showed the effectiveness of proposed method for concrete mixture design. HPC mixture not only increased the moment capacity and amount of absorbed energy of specimens but also changed the behavior of specimens. Moreover, this proposed HPC mixture was more effective for low compressive strength of the concrete core.

KEYWORDS

High performance concrete mixture, Fresh concrete, Active confinement, Passive confinement, flexural behaviour

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Cite this paper

Morteza Naghipour, Marzieh Nemati, Javad Jalali, Mahdi Nematzadeh. (2018) Effect of High Performance Concrete Mixture on Behavior of Passive and Active Confined CFT. International Journal of Theoretical and Applied Mechanics, 3, 17-25