The Research On Integral Stability Of The String Truss Structure

With the continuous economic development and people's living standards increasing in recent years in China made great efforts to the construction of infrastructure, and built a group of international advanced level of the airport, the Convention and Exhibition Centre, stadiums and other large-span, the civilian space to public buildings. In order to meet modern architectural aesthetics of development and construction of the use of functional requirements, light steel structure with respect to the construction of modeling, construction speed, the advantages of the short time limit was widely used in large-span space structure, promote the design and structure of China's space Raising the level of construction.The beam string structure, a new self-balancing system is a combination of a string (Cable), pole and beam-column (beam, arch). Because the beam string structure make full use of tensile properties of high-strength cord, force became more reasonable, transportation became more convenient and construction became more simple for the new self-balancing system. The beam string structure became a the new structure with a good value and prospects. The large-span beam string structure is just beginning to use in China, the representative projects of which is terminal steel roof truss of the Shanghai Pudong International Airport, the Guangzhou International Convention Exhibition Center and Exhibition Hall and Harbin International Exhibition and Sports Center and the National Stadium.Cable network structure is flexible structure, it is tension structure of the system an important part of traditional and rigid structure compared to its structure of two notable features:First, geometry and cable distribution prestressed mutual influence, mechanical analysis Model identified the need to achieve through the form-finding, which is a highly non-linear geometry of the process; two at the structural phase of the work load, mechanical behavior also reflects higher non-linear features. The combination of the two can effectively increase the use of materials, large-span space for the structure of the expansion project has laid a solid foundation. In this paper, the basic theory of finite element is used to analysis. The basic idea of finite element method is that the solution of the problem domain is divided into a series of units, between units connected by the node. The internal demand amount of unit is obtained through the function of interpolation which is founded between balance and energy relations of cell nodes. Since the shape of single cell is simple, the equation of units is became more convenient. Then algebraic equations made by each unit include boundary conditions to solve.First, the large number of domestic and foreign access to relevant documentation on the basis of a simple string truss structure of the development, the status quo and its domestic and international research in engineering practice in the application; briefed on this string of truss structure of the subject background, Research and works at home and abroad application, and clearly the main content of this article.In this paper using of non-linear finite element theory have the main two aspects of research. First, it is to study the static performance of the single truss string structure and to determine reasonable cross-section and prestressed size of the truss string through analyzing the influence of prestressed cable, pole pitch, blow-span ratio of cable and cross-sectional area of cable to the static performance. Second, it is to study integral stability of the truss string structure, using nonlinear finite element method of software ANSYS when the structure is covered full cross-loads. And it is to study the influence of prestressed cable, pole pitch, blow-span ratio of cable, cross-sectional area of cable, the high-span ratio of different widths and vector height ratio to the out-of-plane stability. So, some valuable conclusions is reached through research of this article.