Research On The Method Of Reinforcement And Transformation Of Steel Truss Web

With the progress and development of the times,steel trusses are widely used in industrial and civil construction projects.When the integrated slab truss floor structure is installed for the installation of pipeline equipment such as air conditioners,it often happens that the laid pipeline equipment and the truss system in the structure interfere with each other.In order to facilitate the laying of pipeline equipment,the related truss webs that obstruct the pipeline need to be removed in the project to allow the pipeline to pass directly through the steel truss.This approach will change the structural form of the steel truss,greatly reduce the ultimate bearing capacity of the steel truss,cause damage to the building,and seriously endanger the lives and safety of social property and the people.Therefore,it is necessary to carry out reasonable and effective reinforcement and transformation of the steel truss.In this paper,based on the engineering background of a small-scale steel truss beam reinforcement and transformation project of integrated floor structure,the reinforcement and transformation technology of steel truss web members is studied in depth.Aiming at the defect of the steel truss beam in the project due to the dismantling of the local inclined web due to the laying of air-conditioning pipes,considering the structural stress characteristics and construction feasibility,two methods of reinforcement and reconstruction were designed: Method 1 is to add a vertical web bar at the site where the steel web truss is used to remove the inclined web bar,and weld triangular stiffened rib steel plates at the ends of the steel truss end bar.Method 2 is to add a vertical web at the site where the steel web is removed from the inclined web,and at the same time,weld triangular stiffened steel plates at the ends of the steel truss end bar and the ends of the new web.Next,the thesis analyzes the steel truss after reinforcement and reconstruction,and proposes a corresponding theoretical simplified structure model.Then,the steel trusses reinforced and transformed by different methods are tested and analyzed.The stress and deformation characteristics,failure modes,stiffness and ultimate bearing capacity of the two steel trusses are analyzed.The differences are compared,and the test results are compared with theoretical calculation results to verify the rationality of the proposed theoretical structural model.Finally,using ABAQUS finite element software,the nonlinear numerical simulation analysis is performed on two types of steel trusses after reinforcement,non-defective steel trusses without oblique webs and defective steel trusses with oblique webs removed.The reliability of the finite element analysis method was verified by comparing the results of the finite element simulation calculations of the two types of reinforced steel trusses with the test results.At the same time,the paper further analyzes and analyzes the differences in the static performance of the four different types of steel trusses,verifies the effectiveness of the reinforcement method,and also uses the ABAQUS finite element software to explore the effect of the size of the triangular stiffeners on the steel truss reinforcement.The research results in this paper can provide a certain reference for the reinforcement design of similar steel structures.