The Static And Kinetic Computation Of Stable Type Suspension Bridge By Nonlinear Finite Elements Method

Large displacement, lateral stability limit small-span and mid-span suspension bridge development. To solving these problems, people present stable type suspension bridge for enhancing common suspension bridge lateral stability in structure. According to stable type suspension bridge, writer analyses tower of bridge influence on structure.On the basis of large-displacement virtual principle, the finite element equations of stable type suspension bridge containing towers are driven. The stiffness matrixes of the cable element, the bar element and the beam element using node coordinates are given, too. Such method has not been found inreference books.The static computer programs (no-tower.f and tower.f) and kinetic computer program (zkj.f) are written in fortran language. The static samples of tower-contained and tower-uncontained model under different loads are calculated, the natural frequencies and the modes before the 10th order are also computed .The comparison between two models calculating result is done.There are two main results in the thesis. Firstly, the influences of bridge tower upon stable type suspension bridge static and kinetic analysis are made. In the static case, the stiffness and the internal forces of the tower-contained model become small, the geometric deformations increase, but the changing width is small. The natural frequencies of tower-contained model are lower than those of the tower-uncontained model, and the major modes of the two models are different. The conclusions are important in practice using as design suggestions. Secondly, the stiffness matrixes (special of the cable element) and computer program can be applied into resolving not only the problem of stable type suspension bridge but also a kind of engineering structures, Such as suspension wire structures. From this point, the thesis has practice application.