The Analysis Of Stabilization And Static Behavior For High Pier And Long Span Continuous Rigid Frame Bridge

Along with the development of transportation business, many reasonable, economic and beautiful forms of bridge structure have been created and performed. For special advantages of high pier and long span continuous rigid frame bridge, it is becoming more and more favorable, especially now. Because of the increase of its span and pier height, the stability analysis of bridge becomes more and more important.In this paper, the theory of bridge's stabilization is generally introduced, the critical stability load of the high pier and long span continuous rigid frame bridge is acquired by energy methods in the case of cantilever casting construction, the structural spatial description methods of the geometrical nonlinear theory of bars system is illustrated, and the discrimination between Total Lagrange Formulation and Updated Lagrange Formulation in Lagrange Formulation is emphasized. On the project background of Fengshihe bridge, using the Large Finite Element Analyze Software ANSYS, and selecting three dimensional BEAM188 element which can built-up section referencing more than one material, the author builds up the finite element analysis model, carries out the linear stability analysis of the high pier of 101m, and takes the consideration of the second type stability analysis of geometrical nonlinear and double nonlinear. The conclusion can be made that the result of linear stability analysis tallies well with the theory value reasoned by the energy method and is higher than geometrical nonlinear analysis results, vertical loads such as constant load get up the control action and wind load plays smaller action in the course of stability analysis, and the analysis value of high pier drops quickly considering geometrical nonlinear and double nonlinear which is more important in fact. Moreover, the finite element analyze results agree well with the scene measure, which illustrates that the built analysis model is more reasonable and the value of stability analysis can provide reference for other similar engineering design.