Pier Structural Shape Research Of The High-pier And Long-span Continuous Rigid Frame Bridges

Based on analyses the development and nowadays conditions of stability theory in and abroad, this paper points out that the stability is as significant as intensity to bridges large-span bridges with high piers. Consequently, the main goal of this paper is fetched out. Two kinds of stability problems are simply introduced and it points out that most stability problems come up against in practice is the second stability problem. Furthermore, we come to the conclusion that only if with the study to the relation of geometrical nonlinear to material nonlinear of structure can we deeply discover the essential of complicated stability problems. The formula deducted by energy theory which resolving critical load of self-stability and stability in cantilever construction of high pier with uniform section. The way, the solution and the basic steps solving the stability of large-span continuous rigid-frame bridge with high piers using finite element are given. Introduced bridge's temperature effect, The theoretical formulation of temperature affect continuous rigid frame bridges is acquired by displacement method, it indicate that inner force produced by temperature relate with stiffness and length of pier and beam etc. Then study the thin wall and high pier stabilization combined with temperature, at the same time, take the Bei-shah Bridge as an example, use large general program, establish space finite element model to calculate and analyses temperature affect on stabilization, the result indicate that temperature affect on stabilization is little.The high-pier and long-span continuous rigid frame bridges not only satisfy the vertical equity distortion influencing by superstructure at temperature, concrete shrinkage–crept, and Earthquake transverse force, still satisfy the imbalance bending moment versus pier vertical flexural rigidity' require as well as deflection load acting and crosswind force action down versus pier tensional stiffness' require at cantilever construction stage. Perfect pier divide out satisfy structure as well as construction, transport operation physic least crossbar stiffness' require, and as far as possible make it have major flexural rigidity and lesser resist push rigidity,pier structural style no other than from this line take determinate into consideration to as possible. The stability of several large-span continuous rigid-frame bridges with high piers are calculated and analyses by ANSYS and Midas. As a result, the inner rules influencing the stability of large-span continuous rigid-frame bridge with high piers are initially brought forward, The conclusion can provide reference to the design and construction of the same type, and also lay a foundation for the further study.