抄録
It has been pointed out in this decade that the currently used thick cold-formed box-section columns in building frames may fail in the mode of brittle fracture instead of local buckling, and that their ductility preceding brittle fracture may not be enough to resist a severe earthquake. In order to solve this problem, hot-rolled box-columns have been recently developed, in that the forming is done at high temperature to avoid cold working. In this study, the ultimate behaviors of the box-columns having through diaphragms, which is the current practice in building steel construction, were experimentally investigated. It was found that the newly developed hot-rolled box-columns exhibit much higher ductility than the conventional cold-rolled box-columns when the ultimate state is governed by brittle fracture as well as by local buckling.
