| This paper mainly studies the influence of new end-plate connections of steel frame force performance.The biggest characteristic of new end-plate connections for bolt connection,and the connection bolt hole on the plate to expand a short size of the long hole.It has the advantages of high ductility,good energy dissipation capacity,easy repair,etc.In this paper,an experimental study on a two story and one span steel frame is carried out for the new type of end-plate connection.The column member size is 440×300×11×18,the beam member size is 350×200×10×16.The span of the frame is 6m and the height is 3m.The axial pressure of 100t is applied to the top of the column.Horizontal displacement load is applied to the one and two beam end.This paper mainly analyzes the failure mode and seismic performance of the new type of joint connected steel frame.Secondly,the finite element software ABAQUS is used to establish the same model as the experimental framework.The accuracy of the finite element simulation is verified by comparing the failure mode of the finite element with the stress of the key part.Finally,based on the different parameters of the hole enlargement,the finite element method is used to establish the full scale model of four new types of joints for steel frames(K0,K2,K4,K6),and a full scale steel frame model with traditional end-plate connections(TR).Through the comparative analysis,the influence of the size of the hole on the overall performance of the steel frame is studied.The following are the main conclusions of this paper:(1)Test and finite element analysis show that the new connection will consume energy by slip,therefore,the development of plastic deformation or damage of key parts such as steel frame beam,column,joint region and connections root significantly eased,especially for delay or avoid the beam plastic hinge effect and it is possible to repair work after the earthquake.(2)The new type connections of steel frame(K0-K6),were experienced in the elastic stage,slip stage and bearing stage,along with the expanding increases,and the longer the slip,but the structure of the slip load and displacement and ultimate bearing capacity are basically the same,is not affected by the size of the hole.(3)The larger the size of the hole,the lower the damage of the steel frame under the action of external load,so the whole stiffness of the steel frame is greater when the joint is pressed.(4)The new connection can significantly improve the ductility of the structure,the larger the hole,the greater the ultimate displacement,the better the ductility,the ductility ratio of K6 increased by more than 15%compared with TR.(5)The new connection can significantly reduce the base shear of the structure in the sliding phase,compared with TR,the general can be reduced by about 8%,and the larger the hole,the smaller the structural base shear.(6)The new connection can also reduce the overturning moment of the structure,the larger the hole,the more the decrease.K6 decreased by 20%compared to TR. |
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