2019 年 37 巻 4 号 p. 162-172
The purpose of this paper is to examine the influence of fracture toughness and non-welded part in submerged arc weld (SAW) on deformation capacity of pre-assembled H-shaped beam to column joint. For this purpose, higher toughness (about 60J) and lower toughness (about 20J) SAW joints were prepared. In addition, improved beam end scallop details, BS_P (billet insertion), BM (mini scallop), and BF_5 (height of fillet:5mm), were proposed. The rate of increase of strength and the deformation capacity of these four type details were examined by experiment. From the results of experiments, it is revealed that brittle fracture at beam end flange is likely to occur at small deformation when the field welding beam to column joint has BS (composite scallop) detail and non-welded part of low toughness SAW. On the other hand, using higher toughness SAW and shortening non-welded SAW parts delayed brittle fracture and raised deformation capacity. Moreover, using proposed improved beam end scallop details buffered stress at the bottom of scallop and improved deformation capacity. Therefore, the authors showed following the method for improving deformation capacity of field welding beam to column joints.
1) Improving toughness of SAW
2) Using proposed improved beam end scallop details
3) Shortening the length of non-welded of SAW