The Mechanical Properties Analysis Of The Two-way String Truss Structure

With the continuous economic development and people's living standards increasing throughout China in recent years made great efforts to the construction of infrastructure, 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.Now the cross-structure, two-way truss structure string form of single,two-way truss string steel structure, winding orthogonal to the vertical and horizontal plane of the truss; Xiaxian the pre-cable steel rod through the bottom of the two-way cable folder Nodes, a two-way cable network Tension space, the new structure, two-way span, with the development of innovative technology. A steel roof for the National Stadium on behalf of the two-way string truss structure, a shell structure and the cable network structure of the dual nature:Shell structure compared to other spatial structure, because of its mechanics and the reasonableness of the economic production of good By combining together, processing can be standardized, normalized; light of the characteristics of its materials for transportation, installation and other construction has brought great convenience, design methods compared to other means of spatial structure have been more mature, these are decisions of the shell structure Relative to other spatial structure of more and more. 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.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 two-way 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, use of non-linear finite element method, the two-way truss string of static and dynamic design of a number of problems-two-way truss structure of the string of static, modal characteristics and dynamic characteristics of the earthquake to carry out the study, obtained A number of valuable conclusions.Prestressed string of two-way truss structure of the nonlinear analysis method was discussed, according to the virtual work of the equation nonlinear finite element basic equation, on the basis of derivation of the hybrid beam, and cable-yuan yuan consider the geometric Nonlinear finite element formula. Through two-way truss string model analysis of the design parameters of the main string truss structure static properties of, access to some valuable conclusions, according to research findings, and made a more specific design proposals.This study shows that the two-way string truss structure, the whole structure of the vertical plane of the vibration and the lower part of local cable network in cable and the plane vibration in the upper truss shell in the local bar to reverse a two-way truss structure since the string Vibration of the main aspects. Therefore it is necessary to study the structure of the overall trend, but also do a good job in the local bar by the force of rational analysis to ensure that the overall structure of reliability and stability analysis. In the text of the design parameters of the structure of the natural frequency response and the impact of the earthquake.