Membrane structure parking shed Mechanical properties of materials
The membrane materials used for the membrane structure of the membrane structure shed are high-strength composite materials with high strength, flame retardancy, durability, self-cleaning and other characteristics, which are generally composed of substrate and coating. The base cloth is mainly made of high-strength polyester fiber or glass fiber silk, and has many weaving methods, such as flat weaving and twisting. Different weaving methods of the membrane structure canopy affect the mechanical functional indicators of the membrane materials in the warp and weft directions, as well as the tensile strength and tear resistance of the supply membrane; The coating materials mainly include polytetrafluoroethylene and polyvinyl chloride, which has improved the strength indicators of the membrane materials to a certain extent. In order to improve the durability, self-cleaning and other characteristics of the membrane materials, the surface often has a layer of fluorine coating or silicon coating. The fire resistance, durability, waterproof, self-cleaning and other functions of the membrane materials determine the physical characteristics of the membrane materials.
The membrane structure parking shed material is a kind of high strength and soft fabric, with high tensile strength and certain tear resistance, but its in-plane compressive and bending strength is almost zero, shear strength is also very low, and it has certain anisotropic and geometric nonlinear properties, and is prone to stress relaxation and creep when used
In practical engineering applications, with the different types of membrane data for membrane structures, the prestress in the membrane is generally 1~8kN/m. Even under the most unfavorable load conditions, the stress value in the membrane is only 1/4~1/8 of its tensile strength. For simple design and calculation, the membrane data can generally be assumed to be linear elastic data of orthogonality, which can be known from the theory of elasticity, Constitutive relation of plane stress orthotropic elastic data.
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