Study On The Seismic Performance Of TT-joints In Steel Pipe Truss Structures

With the development of society and the acceleration of urbanization process,people’s demand for large-span structure increase rapidly.Due to its good mechanical properties,steel pipe truss structures widely used in stadiums,factories and other large-span buildings.As steel pipe truss joints play the hub role in every forced component,the mechanical properties of the joints plays a vital role in the structure.Nowadays the current crustal plate activity is relatively active.The earthquake,occurred in every region,which is harm to the daily use of the structure.At present,the study of strength on the plane and space nodes has become mature in Europe and the United States.However,there is still a lack of research on the seismic performance of the nodes.In this paper,In this paper,we will do research on the seismic behavior of TT-type joints of welded steel pipe trusses.In this paper,the finite element software of ANSYS is used to study the seismic performance of TT-type RHS joints and cover plate reinforced TT-type RHS joints which are under the low cycle cyclic loading.The mechanical properties of TT-type square pipe joints which contains the stress distribution,failure condition and energy dissipation capacity are analyzed by ANSYS in order to study the seismic performance.By changing the width of the branch pipe,the thickness of the wall,the thickness of the reinforced cover plate,the different joints are compared with the vertical and horizontal so that we can get more reasonable geometric parameters of RHS joints.This article is divided into five chapters.The first chapter introduces the form and characteristics of steel truss joints.This chapter is also introducing the research status of steel truss nodes abroad and abroad,and determines the purpose and object of the study.In the second chapter,the seismic design theory and seismic analysis method are briefly introduced.The seismic mechanical properties of TT-type direct welded RHS joints are studied by using ANSYS finite element software and nonlinear characteristics.The third chapter is used to determine the size parameters of the specimen,and the finite element software of ANSYS is used to establish the TT-type RHS joints and plate reinforced TT-type RHS joints,and then the finite element calculation is carried out.In the fourth chapter,the structural dynamic response data(graphs and curves)are calculated.The stress nephogram,hysteresis curve andskeleton curves of each specimen are compared and analyzed.The influence of each parameter on the seismic performance of the joints is studied.The fifth chapter is the summary of the full text.In this paper,we can see that it is easy to improve the seismic performance of the joints by adding the cover plate in the pipe connection area.It pointed out that the space steel pipe truss nodes also need to carry out a deeper level of research,and discussed the development of space steel tube truss.Finally,it is hoped that the research results of this paper will provide some reference value for the construction and design of TT-type RHS nodes.