This project belongs to the field of civil construction.
Inflatable membrane structure is a large-span spatial structure that uses air pressure to support high-strength flexible membrane material to form a certain rigidity. This project conducts systematic research on the key technologies of the analysis, design and construction of the new system of inflatable membrane structures through theoretical analysis, experimental research, numerical simulation, program development and engineering practice, overcoming the technical bottlenecks existing in the form control, load analysis, structural system application and engineering construction of inflatable membrane structures, mastering the core technologies of inflatable membrane structure design and construction, realizing the complete localization of inflatable membrane structure projects, and reducing the engineering cost of domestic inflatable membrane structures. Promote the application and development of inflatable membrane structure projects in civil (large-scale warehouses, sports and cultural facilities), military (mobile hangars, post-disaster rescue tents, wartime hospitals) and aerospace (hot air balloons, stratospheric airships) and other fields, which will actively promote my country's social and economic development and national defense construction. Key innovations include:
(1) An initial modulus method for calculating the elastic modulus of inflatable membrane cutting shape analysis, which is different from load analysis, is proposed. The constitutive relations of shape analysis and load analysis are determined through tensile test of membrane materials, which solves the key issues of inflatable forming shape control for structures with extremely strict requirements for post-inflation shapes such as inflatable membrane templates and suspension airships.
(2) The moderate Young's modulus method, the inverse deformation superposition method and the zoning step-by-step form-finding method are proposed to analyze the shape of the inflatable membrane structure; a dynamic iterative deformation factor method for the inflatable membrane structure is proposed to control the convergence of the nonlinear analysis of the inflatable membrane structure; the control volume method and vector finite element theory are introduced into the dynamic simulation of the inflation and deflation processes of the inflatable membrane to analyze and calculate the inflation and forming process and the deflation and collapse time of the inflatable membrane; A special analysis and design software for inflatable membrane structures has been developed.
(3) Developed the inflatable membrane structure inflation intelligent management system, inflatable membrane structure access channel control technology, proposed a double-layer interlocking airtight door structure; developed movable inflatable membrane support nodes, cross-cable network nodes, and support anchors, etc. New nodes effectively solve the key issues of inflatable membrane structure formation construction control, construction, and operation management.
(4) New membrane structure systems such as cross-cable network reinforced inflatable membrane structures, air-rib frame-type membrane structures, and air-bearing and air-rib combined membrane structures are proposed, expanding the application scope of inflatable membrane structures.
The project has obtained 11 intellectual property rights, including 1 invention patent, 5 software copyrights, 5 utility model invention patents, and 1 invention patent (published); more than 30 related scientific and technological papers have been published; The project team used research results to design and build the first independently constructed large-scale inflatable membrane structure in China, the first air-rib frame-type mobile hangar in China, the largest air-supported and air-rib combined membrane structure mobile laboratory in China, and the first air-supported membrane structure along the geodesic line. A gas-supported membrane structure with cross-cable networks, and the first air-supported membrane template for a reinforced concrete thin shell structure with independent intellectual property rights in China; Participated in the construction of practical engineering projects such as the country's first flexible stratospheric demonstration and verification airship "Zhiyuan-1" and the largest rigid stratospheric technology demonstration and verification airship; won 1 comprehensive gold medal in the 6th Space Structure Excellent Engineering, and 1 comprehensive silver medal in the 7th Space Structure Excellent Engineering; The main members of the project team participated in the revision of my country's "Technical Specifications for Membrane Structures" and the "Technical Specifications for Membrane Structures Testing" of Shanghai City Engineering Construction Specifications, and the research results improved the relevant contents of inflatable membrane structures; relying on relevant technologies generated by this project, the project completion unit has added an added output value of 117.02 million yuan and an added profit of 16.16 million yuan in the past three years, saving 120 million yuan compared with using other structural forms. The completion of this project has greatly promoted the application of inflatable membrane structures in civil, military, and aerospace fields, and achieved good social and economic benefits.