In recent years, stainless steel is superior in fire and corrosion resistance to ordinary steel, and is widely used as a thin walled member in the structure. Its material characteristics are considerably clarified, but the structural characteristics such as tube branches are not sufficiently studied. In this paper, the structural behaviors of the thin-walled stainless steel tubes with X branch joints are investigated by both the experiment and the FEM analysis. Expanding the concept of a ring-model, yield strength and ultimate strength of the branch joint are estimated.
