Consideration of Safety Factor and Design Code on FRP Bridges built in Japan;Contact interaction of the bolt with the mated elements of a single-shear joint;Coupling interface connection;Current research status of S/C on STOP in JPVRC and prospective joint work among PVRC/EPERC/JPVRC;Damage monitoring at metal/composite mechanical joints by fastening bolt; Destructive disassembly of bolts and screws by impact fracture;Development of steels for high-strength bolts withexcellent delayed fracture resistance