Study On Mechanical Properties And Design Scheme Of Panel Zones In End-plate Connections With Beams And Columns

The assembled structure has been the focus in construction market in recent year. As typical assembled structure joint, extended end-plate connection has higher stiffness, and it can better transmit the bending moment between two adjacent componets. The construction technology of it is convenient. However, due to the low stiffness of panel zone in this type of connection, the shear deformation of panel zone will be too large under the increasing load, which will lead to the high lateral displacement in over-all structure. The design issue of panel zone in end-plate connection should necessarily be deeply studied particularly under strong earthquake.This thesis adopted the theoretical analysis and numerical computation method. The pseudo-static analysis about the types of the end-plate connections, namely, non-stiffener, traditional transverse stiffener, channel stiffener, and steel tube stiffener proposed in the thesis. The effects of different stiffeners on mechanical property of panel zone in end-plate connection were defined through contrastive analysis. A seris of steel tube stiffener connection models were set up by the different thickness of column web and steel tube stiffener, which the best design scheme was defined. In addition, the design suggestion and development imagine of panel zone in extended end-plate connection were proposed, and would provide a kind of reference for engineering practice. The mainly contents and achievements are as follows:① Based on the recent domestic and foreign research achievements on the end-plate connections and panel zone, the new-type steel tube stiffener was proposed. By using software ANSYS, the numerical simulation of the end-plate connection from the exsiting test was carried out. The rationalisation on simulation procedure was verified, and the numerical computation method was determined.② The effects of different stiffeners on mechanical property of panel zone in end-plate connection indicated that three stiffeners each had its merits. The transverse stiffener lead to the good hysteretic performance and full hysteretic curve, but the stress distribution and shear deformation of panel zone, bearing capacity, ductility performance and energy-dissipating capacaty of connections were relatively poor. The channel stiffener supported plastic development of panel zone, improved shear deformantion of panel zone and increased bearing capacity of connections to a certain extent. But the strength and stiffeness of resistance to shear deformation was uncertainly enough to use in the high-rise building. The steel tube stiffener provided higher strength and stiffeness to the connection, limited shear deformantion and stress development of panel zone, and enhanced ductility performance and energy-dissipating capacaty of connection.③ A seris of steel tube stiffener connection models were set up by the different thickness of column web and steel tube stiffener, and mechanical property analysis was done. The results showed that the stress development of panel zone, local bucking of beam, bearing capacity, ductility performance and shear deformantion of connection had no significant change when just changing the thickness of column web. Therefore, thinner column web could be chose to save the amount of steel. As the whole, under the circumstances of same column web, the mechanical property change caused by changing of steel tube stiffener was the same above.