Research On Construction Simulation And Shear Lag Effect Of Prestressed Concrete Continuous Bridge

Using impending construction method，the prestressed concrete continuous beam bridgewill transform from static structure to hyper static structure which existed in constructionprocess and it turn out to be that the mechanical analysis is very complicated. At the sametime， the bridge is more prone to cracking. In order to investigating the mechanicalcharacteristics of main beam and the other significant temporary components， both of whichare used in construction process， it is essential to calculate them in global and localways.The main contents are as follows:In the first place， taking a prestressed concrete continuous beam bridge as background，the values of the key sections of the main beam measured from construction monitoringprocess are consistent with the theoretical values calculated from simulation analysis usingthe finite element software Midas Civil.Secondly， after analyze the NO.0segment and suspended basket， the results meet thecorresponding regulatory requirements.At last， through classical finite difference calculus， this paper describes the methodsand procedures while solving the value of shear lag，and then we apply this theory to solvethe value of shear lag while the bridge is under gravity. The simulation results conclude atypical normal stress transverse distribution chart of pier sections in suspended stage aftercomparing with the results calculated from finite element software.This paper summarizes the regular pattern of normal stress transverse distribution，besides， it also makes suggestions to the design of large span prestressed concretecontinuous beam bridge in order to ensuring the safety during the construction process.