Abstract
This paper investigated the static behaviour of glass fibre reinforced polymer (GFRP) built-up hollow and concrete filled built-up beams tested under four-point bending with a span-to-depth ratio of 1.67, therefore focusing their shear performance. Two parameters considered for hollow sections were longitudinal web stiffener and strengthening at the web–flange junction. The experimental results indicated that the GFRP hollow beams failed by web crushing at supports; therefore, the longitudinal web stiffener has an insignificant effect on improving the maximum load. Strengthening web–flange junctions using rectangular hollow sections increased the maximum load by 47%. Concrete infill could effectively prevent the web crushing, and it demonstrated the highest load increment of 162%. The concrete filled GFRP composite beam failed by diagonal tension in the lightweight concrete core. The finite element models adopting Hashin damage criteria yielded are in good agreement with the experimental results in terms of maximum load and failure mode. Based on the numerical study, the longitudinal web stiffener could prevent the web buckling of the slender GFRP beam and improved the maximum load by 136%. The maximum load may be further improved by increasing the thickness of the GFRP section and the size of rectangular hollow sections used for strengthening. It was found that the bond–slip at the concrete–GFRP interface affected the shear resistance of concrete–GFRP composite beam.
Highlights
Pultruded glass fibre reinforced polymer (GFRP) sections have shown potential application for bridges [1,2,3,4], building construction [5], and strengthening [6,7,8] due to the lightweight, high strength, and corrosion resistance characteristics
The results showed that concrete infill increased bending stiffness and maximum load by preventing local deformation such as crushing and buckling
This study investigated the shear behaviour of GFRP rectangular hollow and concrete built-up beams tested under four-point bending
Summary
Pultruded glass fibre reinforced polymer (GFRP) sections have shown potential application for bridges [1,2,3,4], building construction [5], and strengthening [6,7,8] due to the lightweight, high strength, and corrosion resistance characteristics. Concrete infill prevented premature buckling and web crushing, increased the ultimate load by 100–141% compared to GFRP hollow beams tested under bending [24]. The results showed that concrete infill increased bending stiffness and maximum load by preventing local deformation such as crushing and buckling. This study investigated the shear behaviour of GFRP rectangular hollow and concrete filled longitudinal web stiffener and strengthening at the web–flange junction. Web–flange and concrete infill by increased maximum failed by Strengthening web crushing atthe supports while junctions concrete filled section failed diagonalthe tension at the load of GFRP hollow sections. Strengthening the web–flange junctions and concrete infill increased the achieved maximumgood agreement terms of maximum load and failure compared the experimental results. (SHS), the thickness of the flanges, and the effectiveness of longitudinal stiffeners for GFRP beams with thinner Program webs
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