Mechanical Performance Of Irregular Panel Zone In Steel Structure With Square Column

The 21st century is the era of science and technology.Building technology is developing rapidly.People have continuously improved the appearance and function requirements of buildings,and complex and diverse structural forms have emerged.Therefore,in addition to standard node fields,some special-shaped node fields also appear in the structure.The node domain is an important part of the structure.The existing steel structure design standards clearly give the design formula of the standard node domain.From the standard node domain formula,it can be seen that the bearing capacity and stiffness of the node domain are related to the effective shear volume of the node domain.Because of the uncertainty in the calculation method of the effective volume of the node domain for shearing resistance of the abnormal node domain,and the existing various specifications do not clearly specify its design requirements,this brings inconvenience to the design of this type of node and also leaves a hidden safety hazard in the project.Therefore,it is necessary to study the non-standard heteromorphic node domain.In the steel frame structure,when the beams on the left and right sides of the frame column have different spans,if beams of equal height are used to penetrate the entire floor,the stiffness of the short-span beams will be enlarged,and the design concept of“strong column and weak beam" is difficult to guarantee.The slab area of the joint domain is prone to shear failure,so the design method of the left and right unequal height beam-column joints is more reasonable,and reducing the height of one side beam not only saves materials,reduces the total weight of the structure,but also improves the ductility of the structure to a greater extent,In line with the design criteria of "strong nodes,weak members".The main research content is:Establish the finite element analysis model of steel joints with different beam heights through the finite element software ABAQUS,to compare the result obtained from the experimental loading with the result of the finite element analysis,so as to illustrate the rationality of the finite element model;In order to save the time and cost of establishing a single model,the model’s geometric parameters can be quickly modified through the method of Python script modeling.Under the action of reciprocating load,analyze the ratio of column width to ring plate thickness D/f,the height ratio of left and right H-shaped steel beams δ,the magnitude of axial force,the ratio of column width to thickness D/t,and the pair of special-shaped beam-column nodes The initial shear stiffness,energy consumption and other performance effects.And give reasonable suggestions for the design of node size.The results of finite element analysis show that there is no obvious stiffness degradation in the node domains of all special-shaped nodes,and this type of node domain has better energy dissipation capacity.Among the four sets of parameters,the ratio of the width of the square steel tube column to the thickness of the ring plate D/f,the ratio of the width of the steel tube column to the thickness of the column wall D/t,and the ratio of the left and right beam height δ,the left and right beam height ratio δ is related to the special-shaped beam-column node domain and the conventional beam-column The initial shear stiffness,energy dissipation and other mechanical properties of the joint domain have the greatest influence.The ratio of the width of the column to the thickness of the ring plate and the height ratio of the left beam to the right beam have a greater impact on the shear capacity and energy dissipation capacity of the node domain.In this study,the axial compression ratio n has a small effect.