membrane structure building with excellent shape and performance
2018-09-05
Now, a tent-like, flexible building more and more in the city square, large parks and street attractions, its rich shape, beautiful curves to attract public attention, which is known as the 21st century architecture: membrane structure. Membrane structure is a special modern building structure, it is a high-strength flexible film material and tension system, the formation of a certain stiffness of the space structure, is a combination of architecture, structural mechanics, fine chemicals and materials science as one of the high-tech engineering, widely used in sports fitness facilities, cultural and recreational facilities, transportation facilities, Industrial and agricultural buildings and landmark buildings. In developed countries, membrane structure has been used for more than more than 50 years, and the development momentum is still strong. The most commonly used membrane materials in membrane structures are PTFE membrane materials and PVC membrane materials. PTFE membrane material refers to the use of ultra-fine glass fiber woven fabric on the coating of PTFE (PTFE) resin formed by the composite material, characterized by: high strength, good durability, fire retardant, self-cleaning, and unaffected by ultraviolet light, the service life of more than 20 years; with high transmittance, light transmittance of 13%, And the light through the membrane material is naturally loose light, no shadow, no glare; the solar reflectivity is 73%, thus absorbing less heat, even in the summer sun exposure, the interior of the building will not be affected too much. PVC membrane material is a polyester fiber woven fabric on the coating of PVC (polyvinyl chloride) resin formed composite materials, PVC membrane material strength and fire resistance compared with the PTFE has a certain gap, the service life is generally in 7-15 years. In order to solve the problem of self-cleaning of PVC membrane material, PVDF film is usually applied on PVC coating. According to the different structure, membrane structure can be divided into 3 categories: skeleton membrane structure, inflatable membrane structure and tensile membrane structure. Skeleton membrane structure is a steel frame or other material on the skeleton of the coating material, thus constituting the roof or the outer wall of the construction form. The shape includes a flat shape, a single face, and a saddle-shaped hyperbolic shape. Inflatable membrane structure is formed by the membrane structure of the indoor air, and to maintain the indoor air pressure is always greater than the outdoor air pressure, so that the membrane material in a tension state to resist the load and external forces of the structure, divided into single-layer structure and double-layered structure of two forms. The tensioned membrane structure is a structural form formed by stretching the membrane material to the structure by pulling the cable, and the surface of the membrane achieves the internal and external force balance through the change of its curvature.
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