Analysis Method And Application Of Buckling Strength Of Truss Structures Based On The Representative Member

The problem of structural stability is a prominent problem faced by steel structures,and stability problems are encountered in various types of steel structures.The truss structure is an important structural form in steel structure and has been widely used in the construction and development of China.Therefore,it is of great significance to analyze the stability of the truss structure and calculate the buckling capacity of the truss structure to provide a basis for the design of the truss structure.In this paper,the analysis methods of elastic-plastic buckling strength of steel truss structures are few.The elastic-plastic buckling strength analysis method of truss structures based on the representative members is proposed.The main results and conclusions of this paper are as follows:(1)A method for analyzing the buckling strength of truss structures based on the elasticplastic buckling strength of the representative members is proposed.Firstly,the linear elastic analysis of the truss structure is carried out to determine the representative members of the truss structure.Secondly,the linear buckling strength analysis,the elastic buckling strength analysis and the elastic-plastic buckling strength analysis are applied to the representative members.Finally,the buckling strength of the truss structure is obtained based on the elastic-plastic buckling strength of the representative member.(2)The buckling strength of single-member structures,portal frame structures and truss structures under static load and the buckling strength of truss structure under dynamic load are analyzed by using the buckling strength analysis method proposed in this paper,respectively.The failure loads of single-member structures,portal frame structures and truss structures under static load and the failure loads of truss structure under dynamic load are analyzed by using the finite element software ABAQUS.It is found that the analysis results analyzed by two methods are relatively close,and the rationality and correctness of the buckling strength analysis method of the truss structure based on the representative members are verified.(3)By analyzing the buckling capacity of a truss structure under dynamic loading,it is found that the seismic response of the different earthquake records to the structure is very large.In order to analyze the buckling capacity of truss structures under earthquake action more accurately,it is necessary to analyze the buckling capacity of the truss structure based on reliability under earthquake action.(4)The buckling strength of the long-span special-shaped truss structure of a large Art Center is analyzed by applying the method proposed in this paper,and the buckling strength is compared with the failure load analyzed by the finite element software ABAQUS.The analysis results show that the proposed method can be applied to the buckling strength analysis of longspan special-shaped truss structures and the large-span truss structure meet the safety requirements.