Abstract
The outstanding diaphragm connections with steel beams are most popular in steel tubular structures. But, their elasto-plastic behaviors under cyclic loading are not clear in many respects. The purpose of this paper is to clarify the mechanism of stress transmission, deformation capacity and energy absorption capacity. According to this purpose, we made a series of experiments of subassemblages where the column width to thickness ratio was chosen as an experimental parameter. It is recognized that concrete-filled panels have many excellent features.
