Abstract
This paper presents cyclic behaviour of bolted and hybrid–combined bolted and bonded fibre reinforced polymer (FRP) beam-to-column joints between I-shaped members using steel and FRP cleats. Five full-scale cyclic tests are carried out to study moment-rotation behaviour, cyclic response, and failure patterns. The test parameters include position of cleat (flange or combined web and flange), fastening method (bolting or hybrid–combining bolting and bonding) and cleat material (steel or FRP). First two tests had bolted and hybrid joints with steel flange and web double angles. Next two tests had the same joint detailing but with no web cleats. Last test used bolted joint only with FRP web and flange cleats. Three failure modes were observed: shear-out failure of the beam’s bolted zone, adhesive debonding with shear-out failure and delamination cracking. Cyclic performance of the joints was assessed by hysteresis moment-rotation curves and accumulated dissipated energy. Hybrid joints showed the best overall cyclic performance with accumulated dissipated energy about 75% higher than the bolted joints. Bolted joints with FRP cleats exhibited the worst cyclic performance. Flange cleated joints showed similar performance to web and flange cleated joints.
Highlights
Fibre reinforced polymer (FRP) materials have desirable properties for structural engineering applications
The behaviour of beam-to-column joint is studied through moment-rotation hysteresis curves
Cyclic behaviour of pultruded FRP beam-to-column joints between I-shaped profiles is presented in this paper
Summary
Fibre reinforced polymer (FRP) materials have desirable properties for structural engineering applications. There are three main types of FRP shapes in structural engineering applications—pultruded glass fibre reinforced polymer profiles, FRP rebars and FRP strengthening systems. FRP composites have been used in buildings. A FRP 15 m tall five-storey Eyecatcher building was constructed in Basel, Switzerland in 1998, see Figure 1b,c [9]. The focus of this paper is on joints between pultruded FRP I-section profiles. FRP composites consist of high-strength carbon or glass fibres in a polyester or vinylester resin. FRP is a heterogenous material with properties in transvers direction about one-third of the longitudinal values
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