The Testing Research On The Buckling Behaviors Of Tapered H-Section Steel Beam With Thin Web

Large width-thickness ratio is generally applied in tapered members of portal frame, so the influencing factors of interactive buckling are very complex. Howerver, at present, many researches are focused on how the tapered members work when subjected to monotonic static loading. Therefore it has both academic significance and practical value for the research on the buckling behaviors of tapered H-section steel beams under cyclic loading.The fundamental methods for analysising buckling behaviors are introduced; and based on stability theory and nonlinear finite element (FE) method, ANSYS finite element models (FEM) are presented, which introduce shell181 and take geometric and material nonlinear into account. In the process of FE analysis, influence of initial imperfection can be conveniently considered.Seven specimens of tapered H-section steel beams have been tested under cyclic loading, in which, testing phenomenon, hysteresis loop, local buckling, energy dissipation, skeleton curve, displacement ductility coefficient, ultimate load-carrying capacity are focused on. According to the test results, influence of some parameters like web and flange slenderness ratio, web tapering ratio and initial imperfection etc. on the buckling behaviors of members has been analyzed.The specimens are simulated based on FEM,and the results are pretty close to the test results which means that the FEM founded before is good enough.In the end, the buckling behaviors and hysteresis behaviors of tapered H-section steel beams under cyclic loading are analyzed according to different width-thickness ratio of web and flange web,length, tapering ratio.