鋼管柱・H形はり接合部の局部耐力 : 高張力遠心鋳鋼管について

抄録

This paper examines the behavior of the welded connections of the uniquely shaped spun cast tubular columns (called 'Spun column' in the following). The spun columns are distinguished by their shape at beam connections, where the columns have smoothly projected ring stiffeners. The paper reveals that the strength of connections subjected to vertical or horizontal loading can be estimated in the same manner as previously proposed for plane tubular columns. The strength and stiffness of joint panels of the spun columns subjected to horizontal loading are also examined here. The results of the experiment and the investigation are summarized as follows : 1) The ring stiffener projecting from the column surface is effective in preventing excessive out-of-plane deformation of the column wall at the beam to column connection in the rigid frame. 2) The local strength of the spun column connection is estimated in the same manner as for the plane tubular column connection. However, since Eqs. (1) and (2) underestimate the strength of the spun column, they must be modified. Thus, for the local strength of the spun column connection subjected to vertical loading, the following formulae are obtained. For the maximum strength, _<CG>P_<max>=(4.53 B_f/D + 2.05)(T_p/R)^<0.782>(T_s/R)^<0.564>((T_p +h_s)/R)^<0.366> σ_yR^2 …(3) For the yield strength, _<CG>P_y=0.79_<CG>P_<max>…(4) 3) The yield strength of the spun column connection subjected to.horizontal loading is estimated by Eq. (5), when the yield of the joint panel is caused by the shear force.