抄録
The statical characteristics of beam-to-column connections of heavy steel section members at lateral loading are experimentally investigated. The variable factors of this experiment were the size of section, the combination of beam and column members (beam flange thickness : 40.60mm, column flange thickness : 75, 90, 125mm) and the welding method of beam flange to column flange (manual arc weld and simplified electroslag welding), so that eventually six specimens were used. Brittle fracture was observed at the beam-to-column connection under room temperature in four specimens at ultimate stage of loading. In one specimen the brittle fracture tookplace at the center of the panel zone (the crossing area of beam and column members) in the principal stress direction, and in the other three spcimens it occured at thd butt weld of beam flange to column flange. Those brittle fracture took place at 1.06〜1.21 times of the full plastic strength of beam members. This kind of phenomenon was also reported another previous paper. Therefore it is concluded that the brittle fracture at the beam-to-column connection may take place very often at high stress level under lateral loading, when heavy steel section members are used. The relation between the yield strength of the panel zone and that of beam member and the effect of reinforcement of the panel zone by doubler plate were also investigated.
