Abstract
Improvement of the deformation capacity of the column-to-beam joint is an important theme for improving earthquake-resistant performance of building structures. One of the reasons decreasing the deformation capacity is the stress concentration against the beam flange by the scallop (access hole) existence. The non-scallop method is generally recommended to improve this problem, but it has large problem that is not able to apply to on-site joint process. The reinforce welding method around the scallop bottom has developed to be able to apply to on-site joint, and get performance more than the non-scallop method. Improving mechanism is combination with 1) decreasing the stress concentration, 2) increasing effective thickness, and 3) increasing total length of breaking line. The deformation capacity by reinforce welding method around the scallop bottom is maximum 3.2 times as for the conventional scallop method in the reverse repeating bend test using actual structure that beam flange has 19mm thickness and 490N/mm2 class steel. This improving effect is better than the non-scallop method.
