Behavior of Concrete-Filled Single and Double-Skin uPVC Tubular Columns Under Axial Compression Loads



Abraham Mengesha Woldemariam1, *, Walter O. Oyawa2, Timothy Nyomboi3
1 Civil Engineering Department, PAUSTI, Jomo Kenyatta University of Agriculture and Technology, 62000 JKUAT, 00200 Nairobi, Kenya
2 Civil, Const. and Environmental Engineering Department, Jomo Kenyatta University of Agriculture and Technology (JKUAT), PAUSTI and CUE, 62000 JKUAT; 00200 Nairobi, Kenya
3 Department of Civil and Structural Engineering, PAUIST and Kenya Urban Roads Authority, 62000 JKUAT,00200 Nairobi, Kenya

Abstract

Background:

There is an increased demand for high-performance materials in the construction industry due to the high cost, the difficulty of sourcing and shortcomings of the existing construction materials. Some of the deficiencies are corrosion of steel, brittle failure and rapid deterioration of reinforced concrete structures in a harsh environment. Nowadays, there is also a move from one material to another due to the difficulty of sourcing i.e. timber electric poles to concrete poles due to the difficulty of sourcing native hardwood. These situations have triggered the interest to develop an alternative structural system.

Objective:

This paper presents the behavior of unconfined concrete, concrete filled single uPVC tubular (CFSUT) and double skin uPVC tubular (CFDUT) members subjected to axial compression loads.

Method:

The unconfined concrete cylinders, CFSUT and CFDUT specimens were prepared from a concrete class of C25 and tested using a UTM machine at a rate of 0.2MPa/s. The parameters considered where thickness to diameter ratio (2t/D), aspect ratio (h/D) and hollow ratio (d/D). Also, a model was developed to predict the peak strength of CFSUT and CFDUT specimens.

Results:

The result shows that both CFSUT and CFDUT specimens exhibited improved strength, ductility, and energy absorption capacity. For CFSUT and CFSUT specimens, the strength, ductility, and energy absorption capacity increased by more than 1.32, 3.75 and 14.75 times compared to the unconfined concrete specimens, respectively. It is found that the strength decreased as the (h/D) and h/D ratios increased. The result also shows that the strain of CFSUT and CFDUT at the peak strength increased by more than 3.16 times compared to the unconfined concrete specimens. The proposed model accurately predicted the peak strength with AAE of 2.13%.

Conclusion:

The uPVC confinement provided a remarkable improvement on the strength, ductility and energy absorption of concrete. Therefore, uPVC tubes can be used as confining material for bridge piers, piles, electric poles, and building columns to increase the strength, ductility and energy absorption of concrete structures.

Keywords: Concrete-Filled uPVC tube, Double Skin, Ductility, Energy Absorption, Strength, Stress-Strain.


Abstract Information


Identifiers and Pagination:

Year: 2019
Volume: 13
Publisher Item Identifier: EA-TOBCTJ-2019-11

Article History:

Received Date: 05/05/2019
Revision Received Date: 23/07/2019
Acceptance Date: 24/07/2019
Electronic publication date: 23/08/2019
Collection year: 2019

© 2019 Woldemariam et al.

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: (https://creativecommons.org/licenses/by/4.0/legalcode). This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.


* Address correspondence to this author at the Department of Civil Engineering Department, PAUSTI, Jomo Kenyatta University of Agriculture and Technology, 62000 JKUAT, 00200 Nairobi, Kenya; E-mail: abrish27@yahoo.com