Show one briefly describes the technical problems of membrane structure for you

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Source:上海示一膜结构有限公司 Time:2020-09-30 Click:

It is necessary for us to understand and discuss many technical issues, as well as the membrane structure. Membrane structure technical problems need to do some homework, today I show a small editor to briefly describe the membrane structure technical problems for reference.

Since the membrane material itself has no compressive and flexural rigidity, and its shear strength is very poor, its rigidity and stability need to be improved by the curvature of the membrane surface and the prestress in it. For the membrane structure, it does not exist at any time There is no stress state, so the surface shape of the membrane must finally meet the mechanical balance under certain boundary conditions and certain prestress conditions, and load analysis and cutting analysis are performed 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 determine the initial pretension in the cable and membrane. Under the action of external load, the stress in one direction of the membrane increases and the stress in the other direction decreases. This requires the initial tensile stress to be applied to the extent that the stress does not decrease to zero under the most unfavorable load, that is, no wrinkles appear. Because the membrane material is relatively soft and the natural vibration frequency is very low, it is easy to produce wind vibration under the action of wind load, resulting in damage to the membrane material. If the initial prestress is applied too high, the membrane material will become larger, easy to age and have less strength reserves. The strength requirements of the stressed members are also high, which increases the difficulty of construction and installation. Therefore, the initial prestress must be determined by load calculation. The membrane structure formed by the 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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