The Research Of The Effect Of Residual Stress On Ultimate Bearing Capacity Of H-section Steel Beam And Column

For many years, the welded members of steel structure are more popular than the rolled ones in China, but as is well known, the mechanical performance of welded members are effected by many factors: such as the material property of plates , the heat effect during welding process, the residual stress, the weld techniques and so on. In recent years, with the production of homemade H-section steel members, the above-mentioned factors have been well improved. But at present, the comparative study between homemade rolled H-section steel members and welded H-section are far from perfect, so the statistics of residual stress pattern of homemade rolled H-section members. Based on this status, some more detailed study should be done and some conclusions should be drawn for the statistics of residual stress pattern of the homemade H-section members and the amendment of relative design codes。Existing residual stresses bring some positions of steel structure members into plastic state ahead, reducing ultimate bearing capacity of members; in calculating ultimate bearing capacity of steel structure members, good methods taking effect of cold-formed residual stresses into account directly have not been found. With the universal application of computer and development of numerical implementation, building member models fitting reality by computer can calculate ultimate bearing capacity of members under effect of residual stresses. So, in this paper , based on the finite element method, the ultimate bearing capacity of H-section members with imperfection are analyzed by ANSYS, which can create initial stress to describe the residual stress and the residual stress can be concluded in modes, the study of the effect of residual stress on the H-section members is emphasized, in this study, the effect of peak value of residual stress on the ultimate bearing capacity of H-section members are discussed, the difference of ultimate bearing capacity between welded H-section members and homemade rolled H-section are compared, some useful conclusions are drawn.