Study On The Stability Of High Pier And Long Span Continuous Rigid Frame Bridge

In the process of the development of bridge construction,bridge pier due to instability caused by loss of bearing capacity of bridge collapse and casualties in the accident,therefore has important influence on the stability of the bridge safety.In the deep valley area,with its unique advantages and is widely used in bridge construction of continuous rigid frame bridge with high pier and large span,stable performance of domestic and foreign scholars on the continuous rigid frame bridge pier with double thin-wall piers very seriously,but the study of combination type pier on the upper and lower double leg thin-walled pier is relatively small.In this paper,the combination of piers as the research object,the main research contents are as follows:(1)Silent Rong viaduct as the research object,a finite element analysis model by using Midas Civil,to make a reasonable analysis of the maximum cantilever construction load,the load combination,the maximum cantilever stage in the plane of various load conditions outside the stable performance,stable performance and inspection certificate of viaduct the largest cantilever stage.(2)Of the viaduct pier combination type in plane and out of plane stability,through to the inner surface of the Rayleigh Ritz method and energy method principle-are derived based on the buckling coefficient calculation formula,the calculation results and combined the derivation of the pier inside and outside buckling calculation formula and the calculation results are compared with the Midas Civil to verify the accuracy of the formula.(3)Study on combined pier in-plane and out of plane unstable points,plane surface based on the stability coefficient equal to this theoretical basis derived from the viaduct pier Mo Rong combination of lower and upper pier double thin-wall pier reasonable cut-off point position calculation formula.(4)To investigate the influence of Mo viaduct piers Rong combined type of height,beam number and pier wall thickness,initial imperfections on the pier in plane and out of plane stability and reasonable demarcation point of bridge pier.(5)The reasonable construction control measures are given from the aspects of the high pier construction,the complex wind environment,the temperature environment and the construction of the hanging basket.