The Key Technology Research Of The High-Pier And Large-Span Continuous Rigid Frame Bridges

Recent years,there are more and more high pier and long span continuous rigid frame bridges on the highway when many high grade roads have been built in the Midwest and northwest region.For this kind of bridges,some design and scientific research units did a lot of work and got a mass of research results.But the essential issue of the high pier and long span continuous rigid frame bridge is lacked of systematically researching,and many important technique of this kind of bridge need to be researched deeply.Depending the design of the Qin river bridge,it has been studied systematically that the problems of static characteristics,space shear lag effect of main beams,local stress of the zero block,linear and non-linear stability and effective computing length of high bridge piers,snit-seismic,the static and dynamical wind effect to provide theoretical basis for the design of the continuous rigid frame bridge made by the cast-in-place cantilever method.A lot of calculation and analysis have been made by using the MIDAS and ANSYS finite element software on the basis of collection and conclusion of research results.The work of this study:collect and summarise the arrangement of the bridge,main beam and pier,determine the size of the bridge;compute and analyse the static characteristics of the bridge structure in construction and operation stage,get data and compare with limit;build the plate finite element model of the main beams,compute the distribution and parameter considering prestress effect;build a solid finite element model of the zero block,study the method of building the model and dealing the edge condition of the model,analyse the stress distribution of the zero solid block;compute and compare the linear and non-linear stability factor of the high pier and long span bridge with fixed load and moving load;discuss the lateral and longitudinal effective computing length,give a suggestion of the effective computing length of high pier in different situations;build a finite element model of the continuous rigid frame bridge considering the action between pile and earth,analyse the earthquake effect of the continuous rigid frame bridge depending on the aseismic code of the bridge;make sure the static and dynamical wind effect,discuss the problem of wind effect of the longest cantilever arm.In conclusion,the static characteristics and the distribution of space shear lag effect of main beams have been gotten.The suggestion of the effective computing length of high pier in different situations have been given so that we can give specific suggestion of the method of the analysis and evaluation of the high pier stability.The methods and relevant conclusions of this study have high reference value and practical significance for this kind of bridge.