Mechanical characteristics of the bolted joint in the ultra-lightweight hybrid structure for sustainable society

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This study aims to make clear the mechanical characteristics of the bolted joint in the ultra-lightweight hybrid structure by using FRP member for sustainable structures. In this research, the variation of the bolt tension was discussed through one-month monitoring for the strains of FRP members. Also, the non-linear failure behavior of bolted frictional joints in various bolt tension was experimentally made clear. Then, the large deflection behavior, the effects of the relaxation of bolt tension and the associated frictional coefficients were discussed in detail. It was finally suggested that the FRP frictional coefficient of the bolted joints is equal to or higher than 0.45 even the occurrence of the relaxation of bolt tension. Furthermore, the FEA simulations were carried out and it was confirmed that the FEA results are corresponding to the experimental results.