Membrane structure sunshade There are still many ways to deal with the appearance of PVC. You can press a thin metal film on the top of PVC or spray aluminum mist, and use mica or quartz to prevent the appearance from being sticky and contaminated. Glass fiber silicone resin for membrane construction. Silicone resin has excellent characteristics of high and low temperature resistance, water repellency, oxidation resistance, etc. The film material has high tensile strength and elastic modulus, and also has excellent light transmittance. Vestar membrane material is made by coating glass fiber cloth with this resin. This kind of membrane material is seldom used and there are few manufacturers. Glass fiber synthetic rubber construction membrane material. Synthetic rubber (such as nitrile rubber and chloroprene rubber) has good resistance, is stable to sunlight, ozone and heat aging, has outstanding abrasion resistance, chemical resistance and flame retardancy, and can be translucent. However, it is generally used for dark coatings because it is prone to yellowing. Expanded PTFE for membrane construction. The base cloth woven from expanded PTFE fiber is pasted with fluororesin film on both sides to obtain expanded PTFE construction film material.

If the initial prestress of the membrane structure sunshade is applied too high, the coating of the membrane material will increase, which is easy to age and has less strength reserves. The strength requirements for the stressed members are also high, and it is difficult to add construction equipment. Therefore, the initial prestress must be confirmed by load calculation. The mold structure formed by shape finding analysis is usually a three-dimensional non developable space surface. How to form the required three-dimensional space surface through cutting and tensioning of two-dimensional data is a key problem in the whole membrane structure engineering, which is the primary content of cutting analysis. During cleaning, the surface disposal layer of PVDF, FEP and other coating film materials shall not be damaged. Therefore, detergent, strong solvent, hard brush and high-pressure water gun cannot be used. Compared with household soap or tableware cleaner, common membrane cleaner is usually relatively safe, but long-term contact with skin, eyes and mucous membrane must also be avoided.

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, dimension, three-dimensional shape and clearance volume of the building through shape planning, confirm the coordinates and structural form 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 in it. For the membrane structure, there is no stress free condition at any time, so the shape of the membrane surface must meet the mechanical balance under certain boundary conditions and prestress conditions, Based on this, load analysis and cutting analysis are carried out.

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