| Based on the study of behavior of end-plate connections in China and aboard, finite element analysis (FEA) models on vertical end plate beam-column connections of three test specimens in portal frame were established firstly by considering geometric nonlinearity, contact between end-plates, and material nonlinearity. In contrast to analysis results with test ones, the model was verified. In general, they agreed well in bearing capacity, failure mode and hysteretic behavior.Secondly, FEA models of full size vertical end plate beam-column connections were developed, in which the influences of the thickness of end-plate, bolt layout and slant stiffening rib, were considered. The thicknesses of end-plate were 16mm and 20mm, respectively, and the bolts were 14M16 and 10M20, along with slant stiffening ribs or without. Analysis results showed that this type of connections was strong enough in bearing capacity, but very weak in energy dissipation, meanwhile, its intial rotational rigidity belonged to semi-rigid catergrary, with the value of about three multiple linear stiffness of beam.Finally, single span portal frame model was set up, in which the beam and column were modeled by beam element and the connection by spring element. Relationship curves between transeverse displacement on the top of column, the deflection in the middle of beam span and connection ratation rigidity were obtained through altering rotational rigidity of spring to achieve the influence of semi-rigidity of connection.As a result, suggestions on bearing capacity, deformation ability and dissipative behavior of vetical end-plate beam-column connection, and influence of connection's semi-rigidity to structural displacement were put forward based on the analisys results, which may be refered by practice design. |
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