Mechanic Behavior Analysis Of One Large Span Deck Hybrid Arch Structure

Arch bridge,acting as one of the fundamental form of bridge,with wonderful architectural styles and large spanning capacity,was widely used in the construction. Hybrid arch bridge of Steel Tube and Concrete Filled Steel Tube is a new type of bridge which avoided the problem of CFST arch bridge and evolved based on the development of CFST arch bridge.This paper takes the Yellow River Diversion of the South-to-North Water Transfer Project in Shanxi yuncheng, the deck hybrid arch bridge of Steel Tube and Concrete Filled Steel Tube was used in the project, based on the similar in support structure between flumes and bridges. Finite element software MIDAS was used to develop the structure of the whole model.According to the unit simulation of the structural components, meanwhile studying the structure's mechanical properties of its whole on the calculation of the Mechanical model.1) This paper summarizes the static displacement and internal forces of the structure under static load cases,meanwhile modal chamcteristics of the structure are analyzed.2) Introduced detailed about the the relevant regulations of the wind load calculation in code,meanwhile studied the influence of geometric nonlinearity to the structure and the stablity of the structure based on the linear stability theory. 3) Effect of system temperature of the structure was gotten on the analyzing of temperature rising load case and decreasing temperature load case.4) The controling load cases and the safety of the structure was studied on the base of analyzing of different load cases.