However, an improved method was not suggested. clarified un-uniform load distribution in multi-bolt joints because of bolt-hole clearance and bolt position by finite element analysis, and they evaluated the stress distribution coefficients. Connection strength may also decrease due to unavoidable non-uniform clearances between base member and bolt/rivet shank because an FRP member cannot redistribute bearing stress by plastic deformation. Furthermore, a bolted connection lacks initial stiffness because frictional resistance cannot be performed. In the case of mechanical joints, metallic bolts and rivets are often used, but the corrosion resistance of FRP member is not fully utilized because these joints are degraded by corrosion. However, strength variation and stability was not evaluated depending on bonding condition and material imperfection. They concluded that the fully bonded connection could provide rigid and higher connection strength with cohesive failure. proposed adhesively bonded GFRP beam-column connections with an improved connection by angle member and stiffener, and experimentally investigated the connection strength. They clarified the shear strength of CFRTP rod with 5.2 mm diameter as 2.5–3.6 kN, and demonstrated that the specific joint strength can be effectively increased. proposed a new connection method using a carbon fiber-reinforced thermoplastics (CFRTP) rod to joint CFRP plates like a rivet. Coelho and Mottram summarized the bolted connection and its strength, and they suggested that the connection of pultruded FRP should be established by considering the material characteristics, such as orthotropic material properties and the estimation of several failure modes. Several methods have been proposed for connecting FRP members, such as mechanical joints, adhesively bonded joints, and composites of these. In order to use FRPs as structural members, it is necessary to study the connection method. Matsumoto and Yonemaru investigated mechanical performance of a CFRP roof truss member under long-term loading conditions, and it was confirmed that properties were not varied even if specimens were exposed outside. proposed new space frame structures with a grass fiber-reinforced plastic (GFRP) connection method, and the method of structural design and modeling for finite element analysis was clarified. Evernden and Mottram introduced FRP buildings and their manufacturing process to develop FRP buildings in the United Kingdom. investigated the structural behavior of a novel type of FRP bridge-the Aberfeldy footbridges-and they evaluated their dynamic properties by experiment and the finite element method to clarify the long-term performance of FRP bridges. They suggested that the connection method affects structural dynamic behavior. Bai and Keller introduced an FRP pedestrian bridge built in 2005 and investigated its dynamic response behavior. In recent years, the application of FRPs as structural members, e.g., in pedestrian bridges, buildings, and large roofs, has been promoted. Furthermore, the joint strength of the beam using FRTP rivets could be calculated with high accuracy using the method for bolt joints in steel structures through a four-point beam bending test.įiber-reinforced plastics (FRPs) are used for repairing and reinforcing structures because they have a high strength-to-weight ratio and corrosion resistance. Then, it was clarified that non-clearance connection could be achieved by the proposed connection method, so initial sliding was not observed, and connection strength linearly increased as the number of FRTP rivets increased through the double-lapped tensile shear tests. It was confirmed through material tests that an FRTP rivet provides stable tensile, shear, and bending strength. In this paper, we propose and evaluate the connection method using rivets produced of FRTPs for FRP members. Fiber-reinforced thermoplastics (FRTPs) have attracted attention in composite material fields because they can be remolded by heating and manufactured with excellent speed compared with thermosetting plastics. Metallic bolts and rivets are often used for the connection of FRP structures, but there are some problems caused by corrosion and stress concentration at the bearing position. In recent years, the application of fiber-reinforced plastics (FRPs) as structural members has been promoted.
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