Experimental Study on Compressive Behavior of Concrete-filled Double-skin Circular Tubes with Active Confinement

Document Type : Original Article


1 Department of Civil Engineering, Babol University of Technology, Babol, Iran

2 Department of Civil Engineering, Faculty of Engineering and Technology, University of Mazandaran, Babolsar, Iran


A convenient family member of composite columns is concrete filled double skin tube (CFDST); it contains two tubes of concentric steel and also shell concrete that there is between them. The superior or equal potential offering characteristics of CFDST columns are more than counterparts of filled steel tubes of classical concrete (CFST). The purposes of the present study are to provide experimental investigation results into the prestressed load-carrying capacity of CFDST columns. Here, an innovative technique is used to confined concrete prestressing, in which the fresh concrete is compressed for a short-run duration. Sixty-four total specimens were tested with various outer thickness and diameter, inner thickness and diameter, and also CFDST columns of concrete strength that resist axial compression. The experimental results support that the present technique prestressed confined concrete, and it demonstrates that CFDST specimens' load-carrying capacity enhanced significantly.


Main Subjects

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