Optimization Of The Steel Pylon's Constitutions And Analysis Of Pylon Style's Mechanics Characters

Compared with concrete structure, Steel structure has been widely used in civil engineering due to its many advantages. Many suspension bridges and cable-stayed bridges with pylon made up of steel have been built in other countries. However the history using steel pylon in bridge is very short, Code for design of steel bridge can't meet the demands of steel pylon, it's necessary to study the steel pylon.This paper takes the project for example, based on the finite element, optimizes the steel pylon's constitutions and analyzes the pylon style's mechanics characters, in details, the following aspects are investigated.1. The whole bridge model is built by using 3-dimensinon beam elements, and the cable forces are computed under the largest cantilever construction stage.2. The steel pylon model is built with 3-dimension shell elements, the cable model is build with only-tension link elements. The steel pylon model with 3-dimension shell elements is used to analyze the steel pylon's constitutions: The influence of interaction of different width of longitudinal diaphragm and different thickness of longitudinal diaphragm is studied. The ultimate load coefficient of steel pylon with some representative constitutions under the consideration of geometric and material nonlinear is computed. The post-buckling strength can be used by comparing the buckling coefficient and the ultimate load coefficient3. Some different steel pylon style models are built by using 3-dimensinon beam elements, the static and buckle analysis of the pylon styles is made, the static and buckling characters of different pylon styles are gained.4. The ultimate load coefficient of steel pylon model with 3-dimensinon beam elements is compared with that of steel pylon model with 3-dimensinon shell elements, the relation between total stability and local stability is got.