Research On Installation Technology Of Roof Steel Truss Of Handan Airport Building

Large-span spatial steel structures are widely used in many large-scale building structures,such as terminal buildings,stations,stadiums,theaters,conference and exhibition centers,etc.for its good mechanical properties.With the development of the construction industry,there has been a higher pursuit in function,shape and span for this type of large-span structure.Therefore,large-span steel structures are facing new challenges in design and construction technology.Based on the roof steel truss project of Handan city terminal,this paper adopts theoretical analysis method,numerical simulation method,comparative analysis method and empirical method to study the installation process of space long-span steel truss structure from the aspects of plan selection,plan feasibility analysis,and plan demonstration.The main research contents and results are as follows:(1)The installation process theory of the existing large-span steel truss structure has been discussed and analyzed in three aspects: construction and installation method,construction mechanics theory,and finite element software.The steel truss structure installation technology research provides a theoretical basis,and also provides a theoretical basis for similar projects in the future;(2)According to the features of the site and the project,the suitable installation plan for this project has been priliminarily selected,and simulated through finite element(Midas Gen)simulation technology.During the hoisting stage,the mechanical performance of the hoisting stage was analyzed,which verified the feasibility of the hoisting scheme,and also provided technical ideas for the hoisting scheme of similar engineering steel truss;(3)The numeeical simulation in the forming stage for this project has been conducted by using Midas Gen finite element software.The life and death element technology and the forward installation analysis method were used to simulate the forming process of the roof steel truss.The mechanical performance of the stress and displacement response of the structure under each construction step have been analyzed.The stability performance is analyzed through the buckling load factor;the feasibility of the forming scheme at the installation stage was verified,and the main mechanical properties of the spatial long-span steel truss structure during the forming process are also obtained,which can be used to guide the construction of similar projects;(4)In the unloading stage,finite element(Midas Gen)numerical simulation analysis has been conducted.Combined with the calculation results of the last step of the forming stage,the changes in mechanical properties and stability of the structure has been analyzed from forming to unloading;verify the installation stage.While the unloading scheme is feasible,the main mechanical properties of the large-span steel truss structure during the unloading process are also obtained,which can be used to guide the construction of similar projects;(5)Through monitoring of the overall settlement of the structure and the local members during the unloading stage to ensure the safety of structural construction.In addition,through the comparison and analysis of the results from monitoring and calculation,both correctness has been verified mutually.Finally,it is confirmed that the steel truss installation technology researched in this paper is feasible and can be used to guide the construction of similar projects.