Behavior of concrete-filled pvc tube columns under axial load

Abdulrazzaq Azeez, Alyaa (2018) Behavior of concrete-filled pvc tube columns under axial load. Doctoral thesis, Universiti Tun Hussein Onn Malaysia.

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Abstract

A concrete-filled tube (CFT) column system offers numerous advantages due to its large axial stiffness and capacity. In the system, steel is a common type of material and has been widely used. However, the application of FRP and PVC came into the picture as the alternative to the steel application in the system. In this study, the concrete-filled PVC tube (CF-PVCT) columns subjected to axial load were considered in both experimental and numerical analysis. The PVC tube is a low-maintenance material and locally available in abundance. The investigation on such columns was carried out to study their potential and the success of such columns would be a milestone achievement in the local construction industry. The study involved parameters such as variable lengths, diameters, and thicknesses of the PVC tube as well as various concrete strengths for the concrete infill. A total of 110 columns which included CFPVCT, CF-PVCT confined with plain PVC socket, hollow PVC column and concrete columns were tested under axial load. From the experimental results, the CF-PVCT columns failed in shear, outward buckling, sudden explosive as well as PVC tube rupture and most of the columns experienced sudden failure. The CF-PVCT columns have a higher capacity of around 32% to 98% compared to the unconfined concrete columns; however, the CF-PVCT columns confined by plain PVC sockets achieved more capacity (23% to 54%) than the CF-PVCT columns. The increase of the thickness and diameter of PVC tube led to a good increase in ultimate strength and the corresponding strain of the CF-PVCT columns. The displacement at ultimate load decreased as the concrete strength increased while it increase as the thickness of tube and slenderness ratio increased. The increase of the slenderness ratio led to decrease the ultimate strengths and the axial strain of CF-PVCT columns. A simulation using finite element software ANSYS v14.5 was conducted to validate the experimental work. Three empirical equations to predict the ultimate strength for CF-PVCT columns by using three approaches were proposed according to ACI 318-08. Finite element analysis by ANSYS indicated similar behaviour in terms of axial displacement and mode of failure. The empirical equations proposed in this study showed good agreement with the experimental values. The approach using PSO could predict the ultimate load of CF-PVCT column with higher accuracy.

Item Type:	Thesis (Doctoral)
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA401-492 Materials of engineering and construction. Mechanics of materials
Divisions:	Faculty of Civil Engineering and Built Environment > Department of Civil Engineering : Structural and Materials Engineering
Depositing User:	Mrs. Sabarina Che Mat
Date Deposited:	06 Jul 2021 06:44
Last Modified:	06 Jul 2021 06:44
URI:	http://eprints.uthm.edu.my/id/eprint/152

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