An investigation of the composite action of an FRP/concrete prismatic beam

Bilinear load-deflection model of fiber-reinforced polymer–concrete composite beam with interface slip

“…8,23 Similar to press blanking lines (PBL) for steel-concrete composite beams, perforated FRP is designed by reinforcing bars passing through holes in the glass fiber-reinforced polymer (GFRP) flanges/ webs and embedding in concrete to prevent FRP-concrete slip. 19,20,24,26 In existing laboratory beams, the load-slip and load-deflection curves consist of two distinct linear stages ( Figure 3). In Stage I, full interaction is assured by cooperation of adhesive, static friction, and chemical bond from concrete; there is no separation and slip, and therefore Bernoulli's beam theory is satisfied; Stage II commences once interfacial bond force diminishes, when slip increases linearly versus load, and the overall beam rigidity (K 2 ) drops compared with that in Stage I (K 1 ), indicating only partial composite action is realized and load-deflection curves and the load stabilize whereas the deflection and slip keep increasing till failure.…”

“…2,7,[15][16][17][18][19][20][21] FRP composites cannot be welded like steel, and therefore, the performance of shear connectors in FRP-concrete interface totally differentiates from that of steel-concrete composite beam with head studs. 15,16,[22][23][24][25][26] The most significant difference is that the load-deflection curves demonstrate a bilinear behavior in many literatures 2,17,27,28 . Therefore, the following pages will propose a novel analysis model to quantify the links between interfacial shear force and relative slip.…”

Discussion: Manufacture, testing and numerical analysis of an innovative polymer composite/concrete structural unit

“…However, the beam still functioned and supported loads up to failure at nearly 5 t. One of the methods which we used in a later study, namely an adhesive compatible with fresh concrete (Sikadur 31, which is a filled epoxy not an epoxy mortar), provided a complete composite action between components of the beam as has been reported in our paper. 23 Small-scale pull-off tests gave values of shear bond strengths of 3·47 MPa. However, this method of bonding might not be the ideal answer when the engineer is confronted with the expoxy adhesive coating of an 18 m long beam.…”

Structural behaviour of layered beams with fibre-reinforced LWAC and normal density concrete

“…Such structures are often called hybrid structures, and the main challenge with this type of structure is the interaction and bond between the materials (Aydin and Saribiyik 2013;Canning et al 1999;Santos and Júlio 2012). A much used application of hybrid structures is the combination of concrete construction methods, e.g.…”