Spatial Analysis For Bridge With Long Span And Wide Box

PC box-girder structure, with its various advantages, has been widely applied in bridge engineering. In order to reduce the self-weight, the units of web plate,base plate and wing plate were very thinly and matches by a bigger overhang arm, has formed the thin wall structure with the big overhang arm .The spatial stress of this kind of thin-walled box girder is very complex, the bending,twist,shear-lag deflection under the load of vertical, the stress distribution is very complicated on the section.Combined with Shenzhang continuous rigid-frame bridge, analyze bending,twist,shear-lag deflection and shear lag problem , Main content as follows:1,Take the existing box girder crosswise analysis theory as the foundation, ascertain shear lag problem used variation method ; restraint twist stress used finite difference method ;shear lag stress used beam on elastic foundation analogy method;cross component used frame analytical method.2,Finite element method numerical analysis. Uses the three dimensional entity finite element model, analyzes ShenZhang to construct the shearing force to stagnate the effect, preciseassurance stress along section crosswise distributed condition.3,The stress analysis about the zero block of continuous rigid frame bridge. Uses the three dimensional entity finite element model, making stress to the zero block of continuous rigid frame bridge.