Long - Span Continuous Rigid Frame Bridge Stability Analyzes

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 continousely,the effect of concret's creep and shrinkage and temperature is also changed.so,in the effect of these factor ,the stabilization analyse of high pier is very important.In the text ,the theory of construction stabilization is generally introduced,the finite-element method is introduced indetail for the stabilization analyse of high pier .in the process of construction the high pier and long span continuous frame bridge, the effect of concret's creep and shrinkage and temperature is mainly introduced.In the text,the analyse of finite-element method's imitation elastane step by step is used in the effect of concret's creep ang shrinkage,in the each time of the analyse,elastane stiffness matrix and geometric stiffness matrix is formed through validity elastic ratio and the secondary inner force,the element stiffness matrix is constitutioned by the two stiffness matrix,in the basis ,the stabilization analyse is performed dynamily.for the effect of temprature,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 simplified temperature,temperature load is equivaled as the load of node.so,on basis of each time's temperature field ,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.trough the aboved methods, the stabilization artificial analyse is executed for the luo river special big bridge,fitting a correction stabilization formula considering concret's creep and shrinkage.