The Stucture Design And Construction Of Terminal T1 Of Chengdu Shuangliu International Airport

In this paper, combining with Chengdu Shuangliu International Airport terminal expansion project, the airport terminal design and construction are studied. This paper introduces the design and construction of steel truss and single-layer cylindrical shell of gallery of Chengdu Shuangliu International Airport terminal hall, analyses the issues which should be focused on in the design and construction of the steel truss and single-layer cylindrical latticed shell. The design of steel truss and single-node of single-layer cylindrical latticed shell are discussed, the author also do research on nonlinear overall stability and imperfection sensitivity analysis of single-layer latticed shell. it represents the measures of pre-stressed beam and column and foundation reinforcement, which are taken to address the troubles in the design and construction of steel truss and single-layer cylindrical latticed shell. Finally, it studies the construction technology of the steel truss and latticed shell, a complete construction plan is worked out.The main work, research results and conclusions in this paper are as follows:1. The spatial steel truss structure with beautiful shape is employed for hall roof in this project. The spatial steel truss structure is more reliable than pre-stress castellated beam and suitable for using in terminal lobby in the airport. The single-layer cylinder latticed shell with the characteristics of good spatial effective, strong sense of rhythm and good performance is chosen for terminal lobby concourse.2. During the analysis of the truss computational module, the reasonable value of K(equivalent lateral stiffness of frame column) is essential. And the node stiffness of the large diameter pipe with directly welded can't be neglected.3. The effect of construction process to the final stress should be considered during the analysis of the truss computation.4. Basing on the test results and FEM analysis, it shows that at the plane intersection node KK in this project, the rotation constraints condition of chord member to the tip of web member is between rigid model and rigid zone model. Then, it is safe and reliable, also reasonable to simplify as rigid node in the design analysis.5. The maximum vertical displacement and the maximum chord member stress of single-layer cylinder latticed shell which is on the semi-span live load are greatly more than the condition which is on the full-span live load, so that semi-span live load is the most unfavorable. The horizontal bearing is considered as elasticity in the actual design, and the maximum vertical displacement is 1/409 of span, not greatly more than the condition which the bearing is ideally hinged and less than 1/400 which is the requirement of Technical Specification for Shell Structure (JGJ61-2003). The maximum stress of chord member is also close to the condition which the bearing is ideally hinged, and less than the design allowable stress of members. The maximum horizontal thrust is significantly declined, then the smaller section of column can be used and the standard of pre-stress can be relevantly cut down. The effective on the actual application and economy is evident.6. During nonlinear overall stability analysis and computation of single-layer latticed shell, the self stability of steel shell should not be the only considered aspect, it is realistic that the underneath concrete structure and steel shell should be considered as a integrated model when analyzing. The geometric nonlinear analysis of shell ultimate bearing capacity in this project which is under tacking account of imperfection sensitivity can satisfy the national specification.7. In the primary phase of the project, the flat slab shell is applied. After being replaced by spatial steel truss structure and single-layer latticed shell, the column should be reinforced by pre-stress, then it can satisfy their horizontal trust. Also the equivalent lateral stiffness of frame column K is enhanced, and the internal force of steel structure member is reduced, the ultimate bearing capacity of single-layer latticed shell is improved.8. In the primary phase of the project, a part of substructure is already constructed, the structure scheme is greatly adjusted after returning work. Thus in the design and construction, basing on the different condition, the foundation reinforcement which respectively implement by eccentric arrangement of precast piles and hand-dug piles received good results.9. Steel truss and steel latticed shell is hoisted by sliding and slice. According to the construction and monitoring results, it indicates that during the hoisting, sliding and placing, the change of stress of steel truss is uniform, the internal force and flexivity do not exceed the allowable range and the service behavior of each truss is in the elastic range. The shell elements are in the good working order after hoisting and placing. The offset of hall columns is small, within the specification allows. It demonstrated that the hoisting scheme is reasonable, safe and reliable.