Study On The Seismic Performance Of A New Type Of Weakly Axial Joint Connected With Full-bolt End-plate

By analyzing the development status of the traditional rural building structure system,it is found that the exposed beam and column in the structure layout still exist,which greatly affects the space utilization and living quality of the building.Therefore,this paper puts forward a kind of cross section for a narrow flange of H steel column node connection form,not only can satisfy the beam-column component embedded within the maintenance wall,the construction technological process is simple and the selected section form a single,decorate in the node of the weak axis component is more flexible and easier to meet the requirements of building multi-functional use.The selected research nodes in this paper are taken from the beam-column nodes in the steel frame structure system.The seismic performance of the joint is studied by means of experiment and finite element simulation.The influence of different parameters on the failure modes and mechanical properties of the joints is discussed through the optimal design of the joints and the variable parameter analysis of the joints.Finally,based on the results of variable parameter analysis of the nodes,and combined with the probabilistic design method,the general m-relation curve of the new node was obtained by MATLAB software operation.After verifying its applicability,a kind of moment-rotation relationship which can guide the engineering practice is obtained,which is beneficial to the control design of the key parameters of the node.The detailed parametric analysis results are as follows:(1)In this paper,the node is a column weak axis connection node.Since the node domain is set with transverse and longitudinal stiffeners,the visible node domain is a rigid node domain when calculating the relative rotation angle of the beam and column,so the contribution of shear deformation and tension deformation of the node domain to the rotation angle value is ignored.(2)The increase of the thickness of the skin in the joint area can greatly enhance the initial rotational stiffness and energy dissipation capacity of the joint,but reduce the deformation capacity.On the contrary,the increase of beam end plate thickness is unfavorable to the ductility of initial rotational stiffness and energy dissipation capacity of the joint.The basic design requirements of strong joints can be met only when the total thickness of the skin plate and the end plate is not less than 30 mm and the thickness of a single plate is not less than 14 mm.(3)The increase of bolt diameter is beneficial to the increase of ductile energy dissipation of initial rotational stiffness and plastic rotational capacity of joint.(4)The increase of the column flange thickness can effectively improve the initial rotational stiffness of the joint.The increase of the thickness of the web in the column joint domain will greatly reduce the ultimate angle and ductility of the joint,but increase the energy dissipation capacity.(5)The change of the thickness of the beam flange directly determines the bearing capacity of the joint.In view of the new joint structure in this paper,the maximum thickness of the beam flange should not be higher than 9mm.(6)The thickness of the web in the column node domain has the greatest influence on the shape of the bending moment-angle relation curve.The larger the thickness of web,the sharper the curve shape.The change of the thickness of the skin plate has the most obvious influence on the initial rotational stiffness of the joint,while the thickness of the end plate is inversely proportional to the stiffness of the joint.