Flexural and axial behavior of pultruded GFRP hollow sections filled with low strength concrete

Muttashar, Majid and Manalo, Allan and Karunasena, Warna and Lokuge, Weena (2014) Flexural and axial behavior of pultruded GFRP hollow sections filled with low strength concrete. In: Australasian Composites Conference (CA 2014): Materials for a Lighter and Smarter World, 7–9 Apr 2014, Newcastle, Australia.


The use of structural pultruded composite sections has gained wide acceptance in civil engineering applications due to its structural characteristics such as high strength, light weight and durability to severe environmental conditions. However, pultruded sections are vulnerable to buckling due to their relatively low modulus of elasticity and thin-walled sections. This paper investigates the potential of using low strength concrete as an infill to pultruded GFRP sections as a means to effectively utilise its high strength. A total of five composite beams with 125×125 mm square section, 6.2 mm wall thickness and 1200 mm span were tested under four point bending load. In addition, five specimens with the same cross section and 600 mm height were tested under compressive load. The effect of concrete infill on the strength, stiffness and failure mode was examined. The study showed that using low strength concrete is a practical and feasible way to enhance the strength and stiffness as it helps to stabilise the wall of the pultruded GFRP beam. In addition, the GFRP wall provides confinement effect to the low strength concrete. The beam filled with concrete has 45% higher stiffness and failed at 150% higher load than that of the hollow section. Similarly, the axial capacity was increased by about 28% compared with the hollow section counterpart.

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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)
Refereed: Yes
Item Status: Live Archive
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying
Date Deposited: 11 Jun 2014 23:46
Last Modified: 14 Jun 2017 00:44
Uncontrolled Keywords: pultruded composite; geopolymer concrete; flexural test
Fields of Research : 09 Engineering > 0905 Civil Engineering > 090506 Structural Engineering
09 Engineering > 0905 Civil Engineering > 090503 Construction Materials
09 Engineering > 0912 Materials Engineering > 091202 Composite and Hybrid Materials
Socio-Economic Objective: B Economic Development > 87 Construction > 8703 Construction Materials Performance and Processes > 870301 Cement and Concrete Materials
URI: http://eprints.usq.edu.au/id/eprint/25282

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