Analysis Of PC Box Section Continuous Rigid Frame Bridge Shear Lag Effect Of Construction Stage

This paper relies on the HuaTianhe bridge as the background project, the spatialfinite element method for analysis of shear lag effect of the bridge construction phase ofthe bridge. Long span continuous rigid frame bridge in the whole process ofconstruction, the girder section stress is a process of constant change, may be in a stageof construction internal force is larger than the full bridge closure into the internal forcestate of the bridge, it is because of the occurrence of such a situation, will lead tointernal force in construction stage instead of full bridge after closure of the bridge theinternal force, known as the internal force of the bridge design control value. So in thelong span continuous rigid frame bridge design is to fully consider the shearconstruction process value effect.Nowadays many scholars at home and abroad for thin-walled box beam shear lagproblems do a lot of research work, has drawn a lot of the mature theory,varioustheories and methods have their respective characteristics. In this paper, on the basis ofprevious studies, mainly researches on the following contents:①using the energy variational method to calculate the shear lag coefficient ofcantilever box girder, and compared the results with the finite element method,andverify the shear coefficient is affected by the loading form influence.②simulation method of the finite element software Midas/FEA to establishcontinuous rigid frame bridge, and compared the relevant calculation of Midas/Civiland Midas/FEA results, to ensure that the two models, provide support for the followingchapters for calculation of the shear lag coefficient.③t oHua Tianhe bridge analysis for construction phase full bridge, and analyze therelative control section changes with the shear lag of construction schedule.④by using the finite element program MIDAS/Civil and MIDAS/FEA analysis of4#block,8#block,13#block, prestressed tension condition after4subsequentconstruction load (applying the next piece of hanging basket,pouring a concrete, mobilehanging basket) influence on the shear lag coefficient mixed concrete has been poured,and summarize the related rules.⑤f or analysis of shear lag effect on the maximum double cantilever andbridge byfinite element program MIDAS/Civil and MIDAS/FEA, summarizes the maximumdouble cantilever and Bridge shear force distribution coefficient, and the existence ofthe negative shear lag effect is verified through the analysis.