Analysis And Scheme Optimization Process Of Truss String Structure

Since the 80 s of last century,China has stepped forward with the pace of modernization.The industry chain has led to the rapid development of the construction industry.Many new systems have been expanded from the traditional brick and concrete structure and frame structure.The long-span truss structure studied in this paper is a new type of large span spatial structure system which is in the ascendant,and is also one of the representative systems of the space structure at the present stage.Because of its good stress and good stability,the truss string structure is widely used in large buildings such as gymnasium,convention center,airport and so on.Truss string structure is subjected to bending load through the upper chord truss,which forms thrust to the support,and the lower pull cable exerts tension to it.The new structure has the function of self balance after the two interaction is counteracted.At present,the research on its structure has also yielded rich results,mainly focused on the performance study and the dynamic characteristics of the structure.The study on the influence of the joint force and the selection of the tensioning scheme on the final shape of the structure is less,so it is necessary to make a careful study of the structural stress and performance in the main construction process.There are many factors affecting the construction process of the tensioned truss structure.This paper will analyze the influence of the structural deformation and internal force change during the tensioning process,the construction process and the importance of health monitoring after the completion of the construction.The influence of the tensioning process is discussed.This paper first introduces the characteristics and classification of the tension string truss structure,and introduces the typical engineering cases at home and abroad in the application and development of the tension string structure engineering.Then,the stress performance of the tension string structure,the calculation theory,the shape finding method,the construction process analysis and so on are summarized.The problems that exist in the study lead to the work that the paper has to complete.Secondly,the geometric nonlinear finite element theory for structural analysis is briefly summarized,and the theory is introduced from two aspects: the basic analysis method and the basic solution method.The basic analysis method includes the complete Lagrange method and the modified Lagrange method.The most commonly used method is the hybrid method.The whole construction process is simulated by the finite element method through the two tensed truss construction projects in the B Hall of the physical model test hall of the Beijing North Railway Station and the Huanghe River estuary.The results show that the simulation calculation and analysis method can be converged and obtain reasonable results.At the same time,the stress situation in the construction process can be obtained.It is proved that the method used in this paper and the finite element software ANSYS can be used to analyze the reliability of the project,which is worthy of reference for similar projects.At the end of the paper,the finite element software ANSYS for a steel structure test hall(first phase)is analyzed,the finite element model is established,and the simulation analysis and calculation are carried out according to the construction method.The conclusion is as follows:(1)the deepening analysis of the joints before the tensioning construction can provide the basis for the tension control value setting of the tensioning construction.In order to ensure the safety of subsequent tension construction,it should become an important process of similar construction.(2)the optimization of the tension construction plan and the simulation results should be consistent with the monitoring results.Through the monitoring during the construction process,the tensile force is adjusted at any time to eliminate or adjust the stress catastrophe,the excessive peak,the damage of the rod and other unfavorable factors,or the parts that affect the quality of the engineering.(3)the necessity and importance of life and health cycle monitoring.After the project is put into use,it is found that the whole structure is well used by monitoring the stress situation and the numerical conditions of the important components during the monitoring and monitoring structure.The above results have certain signification for the construction of similar projects.