Study Of Shear Lag Effect On Π Shape Girder Of Prestressed Concrete Cable-stayed Bridge

This paper introduces thin-wall box girder shear lag effect of thepresent situation of the research and study analysis method were reviewedin detail, and based on this, considering the shear lag effect of currentcalculation and analysis the defects existing in and problems to theactual bridge engineering is SongYuan second songhua river bridge as thebackground, of Long span concrete cable-stayed bridge’s Π shape girderthis section of the form of girders for shear lag effect is analyzed,and the main work content, as shown below aspects:①This papergeneralizes the development and characteristics of Long span concretecable-stayed bridge.②The detailed introduction of simulation method、finite segment method、 variational method is the basic principle andthe related, and further expounded the Π shape girder cable-stayedbridge in the analysis of the shear lag ideas.③Analysis and study oftheΠ shape girder Long span concrete cable-stayed bridge， load of ownweight, load of cable force hanging basket, prestressed load under theaction of the shear lag effect, and get the state the shear lag effectof regularity of distribution.④The main girder bridge deck by settingcross-sectional slope, vertical, horizontal clapboard such status areanalyzed and the shear lag effect and distribution.⑤The constructionstage and according to different bridge phase, and the real bridge ofshear lag effect was obtained, and the different construction stage belowshear lag effect of regularity of distribution.⑥Variational method isdeduced in the application of double girder formula, and combined withdraw the corresponding results of calculation and finite element method,we compare the conclusion.