The Nonlinear Finite Element Analysis Of Cable Net Structures

The cable structure has a small deadweight, and it is convenient to be constructed and to be adjusted to many kinds of architectural shape. With the progress of the science and technology of these years, the cable structure especially the long-span cable net structure is being used more and more widely. Researchers have proposed many kinds of analyzing methods and have carried out some experiments. All of these have pushed forward the application and development of the cable structure.The cable net structure belongs to the flexible spatial tensile structure which has stiffness and can bear loads only after the prestress is applied. With the precondition of the boundary constraint condition and structure geometry being determined, the problem of how to determine a geometry shape which is adapted to the structure prestress condition is the problem of the initial shape determination of the cable net structure, also the problem of form finding. The static analysis and dynamic analysis of the cable net structure can be carried out after the form finding of the structure. Form finding, static analysis and dynamic analysis constitute the main parts of the cable net structure analysis.To the problem of form finding of the cable net structure, this paper firstly gives the introduction of the widely used analyzing methods which include the dynamic relaxation method and the finite element method. Based on the analyzing results of many related reference literatures, this paper figures out several improved measures of the method, which can realize the simple and effective form finding analysis of the dynamic relaxation method.Of course until now, the analyzing method of the cable net structure is still mainly classified into two types, of which one is the analytical method and the other is the finite element method. During the early time of the research, the analytical method was used more frequently, but what can't be denied is that this kind of method is complicated in its formula form and has much computing work to do when it is used, and it is quite difficult to compile the computer program with this kind of method. So the finite element method is widely used and greatly developed in such a era when the computer technology is highly developed. This paper firstly introduces the finite element methods which are often used nowadays. The reference [15] brought forward the four-node isoparametric element method which has a high computing precision and also the...