Study On Influence Of Cable Arrangement On Mechanical Properties Of Cable-stayed Bridge

At present,cable-stayed bridge is developing rapidly in China and has become the first choice of long-span bridge.The cable design of cable-stayed bridge is a key link in the design,and the layout of the cable affects the structural performance.Taking an actual cable-stayed bridge with one tower and one cable plane as an example,this paper simulates and analyzes the static and dynamic characteristics of the cable-stayed bridge with different cable layouts,and compares the stress state in the anchorage zone of the cable pylon with different cable layouts and the influence of cable breakage on the structural performance.The research results provide some references for cable design of cable-stayed Bridges.The main research contents of this paper are as follows:(1)The development history of cable-stayed bridges at home and abroad is summarized,and the structure system,cable distribution form and anchor zone form of cable tower of cable-stayed bridges are described in detail,which provides basic theoretical knowledge for the study of cable-stayed bridges.(2)Using the finite element software ANSYS,the calculation models of cable-stayed Bridges with three different types of cable-stayed Bridges are established,and the internal forces and deformation of the main girder and bridge tower,as well as the distribution of cable forces are analyzed and compared under dead load.The internal force distribution of main girder and bridge tower of cable-stayed bridge under driveway load is analyzed.(3)The basic theory of dynamic characteristic analysis is introduced,and the dynamic characteristics of the cable-stayed bridge with three different cable-stayed forms mentioned above are analyzed.The first ten natural vibration frequencies and vibration shapes are given.Through their vibration shapes,the dynamic characteristics of three cable-stayed bridges with different cable layouts are compared,which provides a reference for cable design.(4)Using the finite element software ANSYS,two kinds of solid models of cable pylon anchorage zone with different distribution forms are established,and the stress situation of cable pylon anchorage zone is analyzed and compared in detail,which further provides the basis for cable design.(5)Using ANSYS to simulate two kinds of cable-stayed Bridges with different types of cables,the static and dynamic performance of the cable-stayed Bridges under different situations of cable breaking is analyzed,and the influence of cable breaking on the structural performance of the cable-stayed Bridges is obtained respectively.