Study On Behavior Of Stainless Steel Uniplanar Welding Circular Tubular Joints

Steel tubular joints have been used widely in the practical engineering due to its excellent mechanical performance, simple and elegant appearance and low steel consumption. In recent years, simplicity and elegance has been maximized by the stainless steel tubular joints; and the durability of carbon steel tubular joints has been fixed by the excellent corrosion resistance and mechanical behavior of stainless steel. However, the lack of design code for stainless steel structure in China, to some extent, affects the wide application of stainless steel structures.In this paper, with reference to the research on tubular joints conducted by domestic and foreign scholars, the main factors like the ratio of brace to chord diameter β、the ratio of chord diameter to thickness 2y and the ratio of brace to chord thickness r which affect the strength of circular tubular X-joints, T-joints were selected and the influence of welding on the behavior of tubular joints was assessed. In addition, in order to verify the validity of finite element analysis, the latest experimental study abroad on stainless steel tubular joints was cited. Based on numerical analysis of tubular joints selected using finite element software, three failure modes were obtained. Through the comparison of numerical results and the strength determined by the design formula in current codes for carbon steel joints, the applicability of current design formulae for design of stainless steel joints was studied. Based on current codes, the corresponding design formulae for stainless steel joints were proposed, providing theoretical basis for future engineering design and theoretical research.