The non-linear dynamic analysis of the super-flexible structures

A new numerical procedure is presented in this paper to solve the large non-linear dynamic equation. Based on the method, the geometric nonlinear dynamic analysis of a super-flexible structure is discussed, The long-span cable stayed pipeline with long natural period is a kind of the super-flexible structure. Its large geometric non-linear results mainly from two factors: the internal forces affect, influence of the large displacement of the pipe elements subjected to the dynamic excitation, the dynamic characteristic(natural periods) and responses (displacements of the elements etc.) of the Fujiang cable stayed pipeline, have been calculated. By the comparison between the numerical and experiment results of the natural period, and the analysis conclusion of the results of both linear and non-linear models, a great influence of the geometric non-linearity on the dynamic behavior of the super-flexible structures is illustrated. Simultaneously, the reliability of the procedure is also proceed.