Research On Mechanical Property Of Steel Frame Jiont With L-Shaped Section Column

"Specially Shaped Section Column Frame Systems" is strived to promote the national Ministry of Construction of the residential structure. The fact in the earthquake told us that the joint always suffered unexpected brittle failures, so the design of joint is the most important in building structure design; it determines the security of the whole building under earthquake. Well until now the research on this kind of frame is just underway, so the mechanical capability of its connection is a very important thing that we should know, if we can do it, it is very useful to project design. In this paper, based on previous research work, select steel frame joints with L-shaped section column as the research object, research and analysis of its mechanical properties.In this paper, the current international very popular finite element software ANSYS, the steel frame columns node three-dimensional solid finite element analysis, finite element model using a more complex with the intermediate node 10-node solid element SOLID92, contact element CONTA174, TARGE170 and PRETS179 four cell types, give full consideration to the material nonlinearity, geometric nonlinearity and the nonlinearity of the state, according to the relevant provisions of the nodes have been standardized design of steel shaped column of 7 nodes (column web thickness and flange thickness change), these seven nodes have carried out finite element analysis, stress and strain distribution of nodes, node capacity under monotonic loading limit, mechanical properties and failure mechanism; node in the cyclic loading, the force and displacement performance of P-A hysteretic curve and the corresponding stiffness degradation curve, Hysteretic models, and energy factor.According to the research, it is found that the steel frame joint with L section column has a good astigmatic capability, all the failure of the joint happened far way from the root of the beam, it is on the beam edge and web; the results also show that the web thickness of column determines the mechanical capability of the joint, the edge thickness of column also have inference on it, but it is much smaller compared with the former. Accord to the hysteretic curve, the hysteretic modes were put forward, it is useful to the designing for this kind of joint.