Green-Economic Constructions Using Composite GFRP Closed Forms
DOI:
https://doi.org/10.56830/IJGMBS12202101Keywords:
Green, Beam, Concrete, Fiber-Reinforced Polymer, TubesAbstract
Green and Sustainability are big words these days. Recently, the demand for more green construction or sustainable construction has been driven largely by consumers in the construction sector. In this study, new filament wound glass fiber-reinforced polymer (GFRP) tubes are used as an FRP-stay in place structural formwork for concrete beams. The test results of an experimental study carried out on 230 mm diameter and 2000 mm long concrete filled FRP tubes (CFFTs) beams are presented. Three CFFT beams and two control specimens without tube were tested under four-point bending. One control specimen was reinforced with steel spirals of stiffness equivalent to the GFRP tube and the other had no transverse reinforcement. The parameters used in this investigation include the effect of laminate thickness of FRP tubes, the type of the internal reinforcements (steel or GFRP bars) and the type of transverse reinforcements (spiral steel or FRP tubes). The fiber orientations of the tubes were mainly in the hoop direction. The two control specimens failed in shear; however, using GFRP tubes instead of transverse steel reinforcement changed the mode of failure of the three CFFT beams to flexural failure. In addition, the GFRP tubes confine the concrete core which subsequently increases the ultimate compression capacity and the ductility of the specimens. Also, test results indicate that the GFRP tube enhances the flexural strength of the specimens, whereas it provides a longitudinal reinforcement in the tension side.
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