Analysis Of Stayed Cable And Study On The Reasonable Finished State Of Cable-stayed Bridge

Cable-stayed bridge and stayed cable are obviously geometrically nonlinear structures. With the rapid increment of the span of cabled-stayed bridge, the length of stayed cable also increases obviously. It is necessary to study the character of long stayed cable. The study on the initial shape of cable-stayed bridge is also important. The main points on the two above problems of this paper are as follows:1)The analytic solutions of stayed cable based on catenary and parabolic profile are summarized, which can be applied to practice conveniently.2)Nonlinear finite element program of stayed cable based on the elastic catenary element is programmed. The analytic analysis and finite element analysis of different stayed cables are compared.3)An approach and program to simulate the tensioned process of stayed cable are established. The tensioned process is simulated by nonlinear finite element based on catenary element.4)The frequencies and vibration modes of stayed cable with different stress are studied. Two approaches are introduced and the results are compared.5) Nonlinear finite element program of cable-stayed bridge is programmed. Each cable is simulated by a catenary element. Tower and the main beam are simulated by some beam elements that can reflect the column-beam effect. Co-moving coordinate system is used to take into account the large displacement of the cable-stayed bridge. The nonlinear equilibrium equation is solved by an increment-iteration procedure. Using shape iteration method, the initial shape of two cable-stayed bridges are obtained with this program. The reasonable initial shape of cable-stayed bridge is studied.