Landscape membrane structure design concept use

    Membrane structure is the latest development of the building structure of a form, it is a good performance of the fabric as a material, or to the membrane inflatable, by the air pressure to support the membrane surface, or the use of flexible cable or rigid support structure Tight, so as to form a structural system with a certain stiffness and capable of covering large span spaces. Since the seventies of last century, the membrane structure has been gradually applied in foreign sports buildings, shopping malls, exhibition centers, transportation services and other large-span buildings. Membrane structure has become a major design in structural design.
    The United States Pavilion at the Osaka World Expo uses a gas-filled air film structure. The elliptical, 140m x 83.5m exhibition center is the world's first large-span membrane structure, and is the first use of polyvinyl chloride (PVC) coated glass fiber fabric. As a true modern engineering structure, the exhibition hall of the Osaka World Expo marks the beginning of the membrane structure era. Since then, the membrane structure in the world has been rapid development. From the span, the United States Pontiac's "silver dome" air bearing air film structure of the plane has 234.9m × 183m, began to use polytetrafluoroethylene (PTFE) coated glass fiber fabric, similar to the large stadium in the North America built nine. From the area, the Saudi Arabia Jida Airport Terminal Hall of the suspension membrane structure covers an area of 420,000 m2.
       As a new form of membrane structure, the cable dome was first used in the 1988 Olympic gymnasium and fencing hall, and later in some sports buildings to be promoted, such as the 1996 Atlanta Olympic Games "Georgia dome", the oval Of the size of 240m × 193m. In order to celebrate the arrival of the new millennium, the British in London built a diameter of 320m "Millennium Dome." The total exhibition hall of the total area of 80,000 m2, covering it is 72 pieces of PTFE coated fiberglass fabric board, the Millennium dome with its unique membrane structure, showing today's construction technology and materials science development level.

    The development of modern Chinese spatial structure has been influenced by the advanced technology of western countries. In recent years, there has been an active trend in membrane structure applications. Although the beginning of the project is small, but has gradually expanded to a larger area and span. The technology and materials used in a way to rely on abroad, but is expected to have more projects to rely on their own strength to complete.
     2, membrane material
     Membrane structure is only in the material problem is solved only after a large number of applications, so the key issue is to provide to meet the functional requirements, durability and economic film. For the membrane structure There are two main building fabrics, namely, coated with polytetrafluoroethylene (PTFE) glass fiber fabric and coated with polyvinyl chloride (PVC) polyester fabric. PTFE glass fiber fabric with high strength, translucent, fire-resistant non-flammable and self-cleaning and other advantages. Although the material warranty period is 25 years, but in accordance with the actual experience, the actual life will be longer. The only drawback of fiberglass membranes is that they are more expensive. PVC polyester fabric and glass fiber fabric compared to its strength and other performance slightly worse, the use of shorter life, but the price is very cheap, about 1/5 or so. In order to improve its performance, a layer of topcoat, polyvinyl fluoride (PVF) or polyvinylidene fluoride (PVDF) can be added to the coating. This surface layer protects the fabric against UV erosion and improves its self-cleaning properties. 

    At present, there are many domestic manufacturers can produce PVC coated polyester fabric, but its performance has not yet fully meet the requirements of construction fabrics, as a permanent building materials still need to be further improved. Recently, some companies are trialing PVDF layer of polyester fabric and PTFE glass fiber fabric, the appearance and performance are greatly improved.