| Steel Tube Structure has been widely applied to modern architecture, especially to long-span architecture, due to its various advantages. Intersecting joint has become the major one in steel tube structure, for its advantages in load-carrying capacity, steel-saving, simple construction, legerity, elegance and so on. In the first and second phase of Chengdu Shuangliu International Airport Restructure project in 1999, steel truss and single-layer latticed shell tube structure with intersecting joint was used in roof structure of lobby and connecting building. This article investigates the operation practice in steel tube structure of the roof design and construction of Chengdu Shuangliu International Airport, studies these topics as follows: select style of roof structure, account the overall structure has effect on the branch structure and inter-effect of the overall structure and the branch structure when analyzing the structure, experimentation and theoretic analysis of the steel tubular structure with intersecting joint, stability of the single-layer latticed shell , construction technology on long-span steel structure etc. Main innovative points and conclusions put forward in this article are listed below: (1) Steel truss and steel latticed shell with single-layer structure with intersecting joint used in the project proves to be able to meet various requirements. This project is feasible in terms of technology and ROI. (2) It's necessary to take such factors into as account the overall structure has effect on the branch structure and inter-effect of the overall structure and the branch structure, so as to identify structure calculation model, conduct structure inner force analysis and adopt correct construction methods. In the project , We had taken the feasible rigidity-coefficient K when we were selecting the calculation model and were analyzing the overall-structure. It benefits a drop in the inner force of the steel truss and the latticed shell structure and benefits feasible designing the sub-bracing structure, bring very good ROI as result. (3) In current circumstances, the method of combining experimentation and theoretic analysis should be adopted to solve the problem in load-carrying capacity and rigidity of intersecting joint. The conclusion drawn from test and analysis in this article is: The strength of intersecting joint in this project is safety enough ; It is feasible to accounting feasible rigidity of the multiplanar intersecting KK-joint of the steel truss in designing and analyzing for it has more rigidity than 0; As the uniplanar intersecting KK -joint of the latticed shell has enough joint-rigidity, it is able to meet the assumption that the joints in latticed shell is rigid and it is safety and reliable and it is feasible. (4) These factors should be fully evaluated in analyzing the overall stability of the latticed shell: boundary restraint conditions, initial rigidity of structure, location of load etc.. The test research and theory analysis in analyzing the overall stability of the latticed shell proves the latticed shell in this project is stable in normal circumstances; when it loose stability ,it is limited value-style. (5) In the complicated and difficult construction , emphasis needs to be put on difference of the construction and the structure working in fact and select feasible plan through pre-analyzing . It's also necessary to test implementation process. Applying this principle, this steel tube construction project is feasible and safe in operation. The technology can be applied in similar projects.
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