| Because of assembled steel structure’s good mechanical performance,convenient installation,low energy consumption,low pollution of contribution to environment,assembled steel structure gradually be recognized by society,the country began to encourage the development of assembled steel structure industry.In 2016 the government report pointed out the need to actively promote green building and building materials,vigorously develop the assembly building.Beam column joint is the key part of the assembled steel structure,which plays the role of the transfer of bending moment and shear force,and the quality of connection joint of the beam column directly affects the force performance of the whole assembled steel structure.The damage Analysis of similar steel structure found that the failure of steel structure building is mainly concentrated in the welded of beam and column joint.Because of the field welding quality is difficult to guarantee,especially high altitude welding,therefore,the assembly of steel structure to minimize the field welding,especially high overhead welding.This paper mainly introduces the steel structure "HU" assembly rigid connection.It is a connection that the splice plates are interlaced on the cantilever beam lower flange and frame beam upper flange.Splice plates and beams are pre-connected by welding in factory and then installed using bolt connection on site only,the field weld between the beam and the column is basically avoided.In order to know well the failure mechanism and mechanical properties of the "HU" assembly rigid connection,the experimental study and finite element simulation were carried out on this connection.First,the quasi-static loading test was carried out on five specimens,in which four of the specimens weld brittle fracture at beam column connection after yielding,for further study on the mechanism of the connection,the brittle fracture specimens was strengthened with encased steel and re tested.The results showed that the column of the specimens showed “S” shape in different degrees in the plane after the specimensfailure;the increase of the width and the thickness of the splice plates had a little effect on the ultimate bearing capacity of the specimen,when the beam web was strengthened the ultimate bearing capacity increase obviously;the final failure position of each specimen was concentrated at the junction of beam and column;the strengthening of the web and the slippage of the flange plates made the specimens have good energy dissipation and ductility performance,ductility performance were above5.Secondly,using ABAQUS to finite element simulate splice plates with different thickness and width,and different friction coefficient.The finite element simulation results indicated that the greater the plate thickness,the greater the ultimate bearing capacity of the test piece,the better the energy dissipation;the width of the splice plates had little effect on the mechanical properties of the specimens;The friction coefficient had a significant effect on the energy dissipation of the specimens: the greater the friction coefficient,the better the energy dissipation performance of the specimens.Finally,finite element and experimental results were compared,they were in good agreement... |
