Study On The Seismic Performance Of T-joints In Steel Pipetruss Structures

With the further improvement of infrastructure and the urbanization process in China, steel truss structure is widely used in the railway station, terminal and stadiums and other large-span buildings.Among most of these constructions, the steel truss structure becomes the best choice in terms of design due to its simple structure, clear force, good dynamic performance. The joint is an important part of steel structure, and they are great importance to the whole performance and safety structure.In recent years earthquakes have occurred in some areas in China, resulting in varying degrees of structural damage. The steel truss structure is widely used in public buildings,but the seismic performance research is just beginning; The majority of the research about the steel truss structure concentrated in strength and stiffness of the connection. However study on the seismic performance is limited. Considering the engineering applications and existing norms, the main purpose of this paper is to the study of the seismic performance of T-type RHS joints and reinforced T-type RHS joints. The main contents of this paper are as followings:① This paper introduces joints types and characteristics of the steel truss structure.Based on the research of domestic and foreign scholars,considering the nonlinear behavior at the same time we adopt the finite element analysis method to solve the problems. We use the finite element software ABAQUS to establish T-type RHS joints and reinforced T-type RHS joints of the steel truss structure and study its seismic performance.② We simplify the actual the steel truss structure of the T-type RHS joints and reinforced T-type RHS joints by analyzing the mechanical characteristics, loads, boundary conditions of structure of the T-type RHS joints and reinforced T-type RHS joints. Then, we establish some typical models of different cases in preparation for calculations.③ We establish some T-type RHS joints and reinforced T-type RHS joints of different parameters. The loading form of the structure model that we chosen is cyclic displacement load.④ After calculating each model, we compare results between respective models to obtain the variation of internal force, stress,displacement,hysteretic curves and skeleton curve of critical section on construction progress under different cyclic displacement load.⑤ Studies have shown that it is significantly to improved the seismic performance of T-type RHS joints by increasing the width of the branch pipe and adding the cover plate ring interface board on the main pipe. Under different parameters,skeleton curve have shown that the number of load cycles has little effect on performance of the structure.And it also have shown that the deformation and ductility of the T-type RHS joints was very well.Conclusion of this paper can hopefully be a reference manual for future seismic calculation of design and construction of similar steel truss structure and T-type RHS joints. It may also be a reference for future code revision.