Experimental and Computational Study on Concrete Filled PVC Plastic Tubes Placed In Columns

Abstract

Concrete filled PVC plastic tubes (CFPT) placed in column are formed by inserting concrete filled PVC plastic
tubes inside the concrete column. This paper presents experimental and analytical analysis of CFPT. Plastics
have low bonding with the concrete, so scratching was done on plastic tubes to increase the bonding. The inner
diameter of tube used for making cubes was 100 mm. Plastic tube was placed at the center of the cube. M20
grade of concrete was used for making of cubes and for filling plastic tubes. Specimens were cured for 28 days
and tested under UTM machine for axial loading. All the data of specimen loading and load-displacement
relationship were noted from UTM machine. In this study, a non-linear finite element model was also developed
using ANSYS software to deal with characteristics of concrete and PVC tube. The validation of model was done
by comparing computational results with experimental results. The validated FE model was used for parametric
study like behavior of CFPT placed in column by changing diameter of tube, thickness of tube, number of tube
and L/D ratio of CFPT placed in column. From the study, it is observed that there is decrease in hoop stress in
PVC tube with increase in diameter of tube, thickness of tube and L/D ratio.