Abstract
In order to clarify the demands of the performance of wide flats and steel plates produced by electric furnaces, the requirement for the ratio of the cumulative inelastic deformation to the elastic deformation(req η) of the members are calculated . The experimental results from loading test of beam-to-column welded connection are evaluated by req η. To prevent the fracture type E or F and satisfy the plastic deformabilities with type of site welding, the sulfur content of base metal should he controlled under 0.008%, and the absolved energy at 0°C should he satisfied over 50J.
