Influence of infill concrete strength on the flexural behaviour of pultruded GFRP square beams

Muttashar, Majid and Manalo, Allan and Karunasena, Warna and Lokuge, Weena (2016) Influence of infill concrete strength on the flexural behaviour of pultruded GFRP square beams. Composite Structures, 145. pp. 58-67. ISSN 0263-8223

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This paper presents experimental and analytical studies on the effect of the compressive strength of the concrete infill on the flexural behaviour of composite beams. Hollow pultruded Glass Fibre Reinforced Polymer (GFRP) square beams (125 mm × 125 mm × 6.5 mm) filled with concrete having 10, 37 and 43.5 MPa compressive strength were tested under static four-point bending. The results indicate that filled GFRP beams failed at a load 100–141% higher than hollow beams and showed 25% increase in stiffness. However, the increase in concrete compressive strength from 10 to 43.5 MPa increased the ultimate load by only 19% but exhibited almost the same flexural stiffness indicating that a low strength concrete is a practical solution to fill the GFRP profiles to be used as beam applications. Moreover, the concrete infill prevented the premature buckling and web crushing of the GFRP tube. The maximum strain measured at failure is similar to the compressive strain determined from the coupon test indicating the effective utilisation of the GFRP material. Finally, Fibre Model Analysis which considered the partial confined stress–strain curve for the concrete infill gave an accurate prediction of the flexural behaviour of the concrete filled GFRP sections.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Second prize winner for the USQ School-Specific 2016 Publication Excellence Awards for Journal Articles - School of Civil Engineering and Surveying. Accepted version deposited in accordance with the copyright policy of the publisher.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying
Date Deposited: 06 Apr 2016 04:51
Last Modified: 06 Apr 2017 02:07
Uncontrolled Keywords: composite beam; flexural confinement; failure load; GFRP; concrete strength; flexural behaviour
Fields of Research : 09 Engineering > 0905 Civil Engineering > 090506 Structural Engineering
09 Engineering > 0912 Materials Engineering > 091202 Composite and Hybrid Materials
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970109 Expanding Knowledge in Engineering
B Economic Development > 87 Construction > 8701 Construction Planning > 870101 Civil Construction Planning
Identification Number or DOI: 10.1016/j.compstruct.2016.02.071

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