Abstract
To study the seismic behavior of RC beam-column joints strengthened with sprayed FRP, five 1 : 2 reduced-scale specimens of joints were tested through quasi-static experiments. The failure modes, hysteretic curves, skeleton curves, strength, deformation, degradation of strength and stiffness, ductility, and energy dissipation capacity were studied. Furthermore, the effect of three main influencing factors including the sprayed FRP thickness, strengthened area, and axial compression ratio was analyzed in this paper as well. The results show that sprayed FRP strengthening can improve the seismic behavior of RC beam-column joints effectively. The increase of sprayed FRP thickness can lead to a better seismic performance for the joints. Strengthening area can affect the bearing capacity obviously. Higher axial compression ratio can increase the bearing capacity and initial stiffness, but it can make the deformation capacity and ductility decreased. The study can provide references to further research on the sprayed FRP material for strengthening of RC beam-column joints.
Highlights
Numerous researches have been carried out on reinforced concrete (RC) beam-column joints strengthened by fiberreinforced polymer (FRP) for decades
Researches show that the FRP strengthening technology for RC beam-column joints can effectively improve the seismic performance of the joints without obviously increasing self-weight or volume [1,2,3,4,5,6,7,8], and this technology has the advantages of high strengthto-weight ratio, convenience in construction, and excellent corrosion resistance as well
Due to the complicated loading condition of joints, multilayer FRP must be bonded along different stress directions, which will lead to an increasing consumption of FRP and make the construction more complicated. ese disadvantages have made a serious negative influence on the development and application of FRP used in joint reinforcement. erefore, it is necessary to explore and study some new FRP strengthening technologies for beam-column joints
Summary
Numerous researches have been carried out on reinforced concrete (RC) beam-column joints strengthened by fiberreinforced polymer (FRP) for decades. The main forms of FRP materials are sheets and plates, which are usually externally bonded on the surfaces of beam-column joints. Such an external bonding method still has some disadvantages. Erefore, it is necessary to explore and study some new FRP strengthening technologies for beam-column joints. Due to the randomly oriented reinforcing fibers, sprayed FRP is an isotropic material [10]. Compared with the external bonded FRP used to strengthen beam-column joints, the sprayed FRP does not need any special materials to level the uneven concrete surface [11]. Compared with the external bonded FRP used to strengthen beam-column joints, the sprayed FRP does not need any special materials to level the uneven concrete surface [11]. erefore, the bonding between sprayed FRP and structures will be more direct and simplified, which can lead to a better bonding quality and an easier
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