Research On The Seismic Performance Assembled Lattice Beam-Column Semi-Rigid Joints

As the application of prefabricated building in our country is more and more widespread,but there are always some deficiencies in the connection of nodes,and new node structure forms are urgently needed to deal with all kinds of complicated engineering situations.The research group of our university has developed a new type of I-shaped joint of channel steel,aiming at the problems of difficult assembly and large consumables in the joint of space truss beam column connection.In this paper,i-shaped of channel steel are studied and the following conclusions are drawn:1)In this paper,i-shaped of channel steel is taken as the object,and the solid model is established by using the finite element software ABAQUS.Experimental study on the pseudo-static response characteristic of the stress process,failure mode,hysteretic behavior,ductility and energy dissipation capacity of the joint made from the thickness and strength of channel steel,the thickness of truss beam and pipe wall,the stiffener or not at the channel steel.Through the comparative analysis of the numerical simulation data,it is concluded that the change of the thickness and strength of channel steel has the greatest impact on the joint performance,contributing to determine the optimal parameter combination,which provides a certain reference for the actual project.2)Based on the research results of I-joint of channel steel,the pseudo-static analysis of three I-joint frames with different thickness and strength of channel steel is carried out,and the change curves of hysteretic curve,energy dissipation capacity and stiffness degradation are obtained.It is concluded that the individual energy indexes of the frame with different strength of channel steel are the best under the same level,which is used as the benchmark frame to study the seismic performance under the earthquake.3)Through the quasi-static analysis of i-shaped and frames,it is found that the initial stiffness of the joints has a great influence on the bearing capacity and energy dissipation coefficient of the joints and frames.Based on the ABAQUS model,the modal performance of rigid and semi-rigid frames is analyzed by changing the initial stiffness of the joints,and the natural period of the frame is determined.4)In order to further study the seismic performance of the semi-rigid and rigid i-shaped,three seismic waves are selected to analyze the time history of the frame.By comparing the horizontal velocity,horizontal displacement and acceleration of I-shaped rigid frame and semi-rigid frame,the performance of semi-rigid joint frame and rigid frame under seismic action is determined,and it is concluded that the seismic performance of semi-rigid joint frame is better than that of rigid frame.At the same time,the influence of the initial stiffness of the joint on the time history analysis index is analyzed.5)the pseudo-static analysis of i-shaped and frames and the time history analysis data of the optimal joint frame are studied,and some conclusions are drawn,which provide some reference for the design and construction of i-shaped in the future.