Research On The Stability Of Continuous Rigid Frame Bridge With Large-span And High Pier

In recent decades, as technological progress and improving of industrial level, bridge-building technology is developing rapidly in China. Bridge construction are characterized by span increasing , pier increasing. Among them, the Span Continuous Rigid Frame Bridge because of its advantages, has been widely used. Such a large span and high piers lead to stability problem is very prominent. Therefore, the large-span and high-pier continuous rigid frame bridge's research of stability becomes very necessary.In this paper, the main part of the Changning Lancang River Bridge (124 +220 +124 m) is the research object. By the finite element software MIDAS / Civil ,we build finite element model and do the linear buckling analysis. We considered the first stability theory is the basic principle and do the linear buckling analysis of single pier stage, cantilever Construction stage, maximum cantilever stage, completed bridge stage and using stage.On the stability of each stage calculated the coefficient of structural stability of the various stages to meet the requirements. Among them, the Lancang River Bridge Pier No. 2 in the vertical and horizontal wind loads, the minimum stability coefficients were 25.91, 25.87, we compared the stability factor with the removal of cross-department board, we found the value of without cross-department board is only 42.6% of original bridge; The state's largest cantilever structure in the wind load, weight, construction loads, the minimum stability factor with dropping hanging basket is only 6.102, the lowest for all values of the construction phase, construction phase at this stage should be used as a crucial stage in the stability control; in the maximum cantilever ,without cross-department board structure's buckling mode became transverse direction buckling, show the Department of boards that cross the bridge enhance the stability of Vertical direction; In the using phase, the minimum stability factor is 8.750,higher than the 43.4% maximum cantilever stage, it means transformation of structural systems have a greater impact on the stability...