Turn to the page of common problems in membrane structure engineering

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Source:上海示一膜结构有限公司 Time:2021-12-10 Click:

Show a small class is here again, today we turn to the page of common problems in membrane structure engineering, for the editor, it is very curious what problems will occur in membrane structure engineering! Then let us quickly take the question to find the answer!

The design of membrane structure mainly includes four major issues: shape design, initial balance shape analysis, load analysis, and cutting analysis. Determine the plane shape and size of the building, three-dimensional modeling, and clearance volume through the figure design, determine the coordinates and structural form of each control point, and select membrane materials and construction plans. The initial equilibrium shape analysis is the so-called form-finding analysis.

Since the membrane material itself has no compressive and flexural rigidity, its stiffness and stability need to be improved by the curvature of the membrane surface and the prestress therein. For the membrane structure, there is no stress-free state at any time, so the membrane surface shape In the end, the mechanical balance must be satisfied under certain boundary conditions and certain prestress conditions, and load analysis and cutting analysis should be carried out based on this. At present, the methods of membrane structure form-finding analysis mainly include dynamic relaxation method, force density method and finite element method. The load considered for membrane structure is generally wind load and snow load. Under the action of load, the deformation of the membrane material is large, and with the change of shape, the load distribution is also changing. Therefore, to accurately calculate the deformation and stress of the structure, geometrically nonlinear methods must be used.

Another purpose of load analysis is to fix the cable and the initial pretension in the membrane. Under the action of external load, the stress in one direction of the membrane increases while the stress in the other direction decreases. This requires the initial tensile stress to be applied to the extent that the stress will not decrease to zero under the most unfavorable load, that is, no wrinkles will appear. Because the membrane material is relatively soft and the natural vibration frequency is very low, it is very easy to produce wind vibration under the action of wind load, which will cause the membrane material to be damaged. If the initial prestress is applied too high, the membrane material will become more coated, easy to age and have less strength reserves. The requirements for the strength of the stressed members are also high, which increases the difficulty of construction and installation. Therefore, the determination of the initial prestress must be determined by load calculation. The touch structure formed by form-finding analysis is usually a three-dimensional non-expandable space surface. How to cut and stretch the two-dimensional material to form the required three-dimensional space surface is the most critical problem in the entire membrane structure engineering. Tailor the main content of the analysis.

The original text is compiled from Shanghai Shows A Membrane Structure Co., Ltd.

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