Behavior of concrete-filled pvc tube columns under axial load
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 applicatio...
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| Format: | Thesis |
| Language: | English English English |
| Published: |
2018
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/152/1/24p%20ALYAA%20ABDULRAZZAQ%20AZEEZ.pdf http://eprints.uthm.edu.my/152/2/ALYAA%20ABDULRAZZAQ%20AZEEZ%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/152/3/ALYAA%20ABDULRAZZAQ%20AZEEZ%20WATERMARK.pdf http://eprints.uthm.edu.my/152/ |
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| Institution: | Universiti Tun Hussein Onn Malaysia |
| Language: | English English English |
| Summary: | 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. |
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