We clearly see the importance of membrane structure design to membrane structure buildings, and the current status of membrane structure design and the problems that need to be solved. Only by understanding the problems better can we find a good way to prescribe the right medicine.
Let me talk about the membrane structure design process first:
1. Form-finding design is the key and difficult point of cable-membrane structure design. The so-called form-finding is to find the most reasonable spatial shape according to the characteristics of the membrane material and the requirements of the architect. At present, the more popular form-finding methods include force density method, dynamic relaxation method and nonlinear finite element method;
2. Force analysis The force analysis of a membrane structure generally uses the finite element method to calculate the structure's response under the action of external loads such as snow load and dead weight. Geometric nonlinearity should be considered in the calculation, and the physical nonlinearity of the material can be ignored, and the Newton-Raphson method is used to solve it. In the process of static analysis, if compressive stress occurs in the element, the solution is generally to ignore the role of the element in structural analysis, but the stiffness matrix must be guaranteed to be non-singular in order for the solution to proceed smoothly;
3. Compared with the traditional structure, the membrane structure has a small dead weight, a large flexibility, and a low natural frequency. Therefore, its static and seismic effects do not play a leading role, and the structure is easy to generate wind under the action of wind load. Vibration, tearing and destroying the membrane. Therefore, the dynamic characteristics of the membrane structure under wind load is one of the difficulties and hot spots in the current theoretical and experimental research.
Membrane structure design is generally divided into:
1. Find an initial equilibrium shape
2. Mechanical analysis under various load combinations to ensure safety
3. Cutting production
The main problems that need to be solved are: to ensure that the membrane surface has sufficient curvature to obtain greater rigidity and aesthetic effects; refine the support structure to fully express the transparent space and lightweight shape; simplify the connection between the membrane and the support structure , Reduce the amount of on-site construction and so on.
The original text is compiled from Shanghai Shows A Membrane Structure Co., Ltd.
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