The Static & Dynamic Analysis And Research On Stability Of High Pier Long-Span Continuous Rigid Frame Bridge With High-Pier

In recent years, as highway construction gradually extension from the plains to the mountain micro-Hill District in China, the stability of the bridge is very prominent because piers of long-span bridge rising more and more high and box wall more and more thin;To study its dynamic properties and stability is very important especially for the large-span continuous rigid frame bridge with high pier, this paper studied the static&dynamic characteristics and stability of high-pier based on Large Wujiang Bridge. The main contents and final conclusions of this thesis are as follows:(1)This paper established the finite element model using three-dimensional beam element and researched how to set the Pre-carrying capacity of large-span continuous rigid frame bridge with high pier and check is static stress.(2)This paper analysis dynamic characterist during construction stage and service stage, vibration frequencies and mode shapes of largest cantilever construction stage and service stage was obtained.(3)This paper analysis the high pier stability during the largest cantilever construction stage, and found the most disadvantaged load combination during the largest cantilever construction stage, and calculated the stability characteristic number and modals under all kinds of work-conditions ; service stage linear stability was analysised and the stability characteristic number and modals of service stage was obtained.(4) This paper discussed elements which influence the stability such as piers height, wall thickness, the number of collar beam, stiffness ratio between collar beam and pier, and rgepier dip error of large-span continuous rigid frame bridge with high pier, This paper seek the sensitivity stability parameters and the inner rules to guide the type of bridge design and construction through change the stability parameters and make a series of eigenvalue buckling analysis. This paper obtained some conclusions such as: the most prominent factors is pier height, the pier is higher, the stability is worse; Increase in the number of collar beam may not increase the stability of bridges , the section of collar beam is not as bigger as better; the relatively high stability eigenvalue, the Concrete symbol is quite remarkable to the stability; researched the influence of the stability when the five elements such as pier high,thickness of box wall,the number of tie-girders,double-spacing and concrete symbol work together.