Useful UV resistance: It is not enough to reduce the temperature in the sunshade by light, and the film structure sunshade can also be useful to resist the UV in the sun. Ultraviolet ray is one of the light waves. It can make our skin dark, deteriorate the skin texture, and transform iron, steel, copper, plastic and other objects. After the membrane structure blocks the ultraviolet ray, the objects in the sunshade will be like being placed in a cool room in hot summer. Membrane structure landscape

Beautiful and elegant: besides being strong and practical, the film structure sunshade has another advantage that will make it beautiful. Orthotropic: membrane structure has two stress directions, which are non isotropic. The warp fiber of the membrane roll is the roll length, and the weft fiber is the width. The warp and weft have different limited tensile strength, tensile deformation, and tensile force deformation curves; The warp fibers are generally straight lines, and the weft fibers are winding up and down. Therefore, the mirror deformation is small, and the weft deformation is large. After special pre tensioning before coating, the warp and weft fibers have smaller crimp degree, which makes the two-way force performance similar; Nonlinear: the stress-strain relationship of membrane structure is nonlinear, and its nonlinear strength is related to the membrane structure, stress level and stress times; Inelasticity: the characteristics of membrane structure are related to the load. Under repeated load, the unloading curve and loading curve of membrane structure are not coincident. With the addition of loading cycles, the difference of unloading loading curve gradually decreases, the degree of nonlinearity decreases, and the stress-strain relationship tends to be linear.

Membrane structure sunshade Inflatable membrane structure relies on continuous indoor inflation to generate a certain pressure difference between indoor and outdoor (generally between 10 mm~30 mm water column). The pressure difference between indoor and outdoor makes the roof membrane cloth subject to a certain upward buoyancy, thus completing a large span. The tensioned membrane structure is supported by columns and steel frames or tensioned by steel cables. The planning of membrane structure mainly includes four major issues: shape planning, initial balance shape analysis, load analysis, and cutting analysis. Confirm the plane shape, size, 3D shape and clearance volume of the building through figure planning, confirm the coordinates and structural mode of each control point, select membrane materials and construction plan. Initial equilibrium shape analysis is called shape finding analysis. Because the membrane data itself has no compression and bending stiffness, and the main shear strength is very poor, its stiffness and stability need to be improved by the curvature change of the membrane surface and the prestress between them. For the membrane structure, there is no stress free condition at any time, so the shape of the membrane surface finally meets the mechanical balance under certain boundary conditions and certain prestress conditions, Based on this, load analysis and cutting analysis are carried out. The main methods for form finding and analysis of membrane structures are dynamic relaxation method, force density method and finite element method.

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