Analysis On The Construction Of Prestressed Concrete Continuous Beam Bridge In High Speed Railway

With the development of high strength materials and the cantilever pouring construction method is gradually widely applied to the engineering practice, the prestressed concrete continuous beam bridge bridge become more common. Especially the riding comfort,seismic intensity etc., in more and more in the construction of highspeed railway bridge forms, become widely used. With the use of bridge analysis software, through the establishment of simulation model, can draw the actual bridge structure are important parameters in different construction stages of internal force and deflection etc.. However, in the actual situation of bridge construction, because of the influence of various factors, so that the actual value and the theoretical results are different, so we need the use of linearand stress control means, make the final state of bridge meet the requirements. In this paper, combined with a built in high speed railway continuous beam bridge, the use of MIDAS civil and Midas FEA bridge analysis software, the overall and local analysis of thebridge, to get the corresponding conclusion, and the construction process used to guide a concrete.The paper includes the following contents:①first of all, the development history of brief introduction of bridge, continuous beam bridge in high speed railway characteristics, research status of construction control of continuous beam bridge in high speed railway, and the difference between the continuous beam bridge in high speed railway and highway continuous beam bridge;② Secondly, according to the specific engineering example, carries on the constructionstage of the entire bridge simulation analysis, considering the combination of different loads, internal force and deflection of the construction stage and critical section key that,compared to the actual measurement data and the process of construction, refers to thelinear guide bridge construction and stress control.③ finally, separately carries on the local analysis of zero block and a hanging basket structure, consider the zero block in the initial stages of construction and the maximuminternal force of cantilever stage, consider hanging basket in different load under the combination of strength, stiffness, stability and safety of the situation.The paper draws the following conclusion:①continuous beam bridge in high speed railway and highway continuous beam bridgethere is a marked difference in the structure design, section size, load, prestressing system;②the different stages of construction using the simulation model of continuous beam bridge, obtains the data meet the strength, stiffness, stability, and alignment of the entire construction process and control the stress has a very good role in guiding;③ the use of simulation model of zero block in different construction stages, the stress canmeet the strength requirements, and can compare the entity model and plane frame modelby the difference of force and displacement in the zero block;④the use of simulation model of hanging basket structure, effects of different load combinations, each component of the strength, stiffness, stability can meet all therequirements.