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

High pier and long span continuous frame bridge is widely used in the landform of high chase, mountain valley nearly years. The type of bridge's job practices take the method of segment, the time of job practice is longer and the architecture of bridge is transformed continuously, the effect of temperature is changed. So, in the effect of this factor, the stabilization analyse of high pier is very important.In the text, first, the working character, development actuality and future developmental currentcy of the continuous frame bridge are introduced. Next, the theory of construction stabilization is generally introduced, the stabilization problem is divided into two kinds of instability problems, one is instability with bifurcation points, the other is instability with maximum points. This text mainly concerns with the first instability problem,in fact, the first stabilization problem is eigenvalue problem. In this way, it can provide a reference critical value to the second stabilization problem.Several kinds of methods for the construction stabilization analysis are introduced, the finite-element is introduced in detail. What's more, common mothods for solving temperature field are also introduced: heat exchange method, approximate numerical value method and semi-analytical method. For the stabilization analysis of high pier, in the process of construction the high pier and long span continuous frame bridge, the factors affecting the stabilization of high pier are analyzed definitly, mainly concerning in case of different temperature effects, several stabilization coefficients are obtained which can analyze stabilization analysis of high pier through comparing transformation of temperature, observing these changes by intuitionistic manner, thereby, certain methods for constrution control can be taken in practical constrution.In the text, the analysis of finite-element method's imitation elastane step by step is used in the effect of temperature. For the effect of temperature, the three-dimensional temperature field is simplified as the constant in the way of length and two one-dimensional in the cross-section on the basis of each time's temperaturefield, temperature load is invert into node load, so, the element stiffness matrix is formed considering the node load, stabilization analyse is executed by the stiffness though the above method, the stabilization artificial analyse is executed for the special bridge.