| With the rapid development of transportation engineering constructions,single box and single chamber box girders which meet the requirements of wide bridge decks are popularly used in continuous girder bridges and continuous rigid-frame bridges.Box girder sections are of g- reat web spaces,wide flanges and thin walls,but shear lag effect is very obvious.This phenom- enon would lead stress concentration and transversal cracks in the flange-web intersections,e- ven then result in the insecurity of bridge structures. So it is of significant importance to analy- ze the shear lag effect in order to understand this phenomenon and guide the optimal design of bridges. In this paper, ZiyangHanjiang bridge as an engineering background, analysis of the continuous rigid frame bridge the shear lag effect, this article reads as follows:(1)A brief introduction to the shear lag effect causes, and domestic and foreign scholars on the shear lag effect of the situation,and currently used to solve several methods of shear lag effect.(2) Describes the energy variation method with bending load in the shear lag effect. Using energy variational method derived bending loads in the box shear lag effect of the basic differential equations, in this based on the deduced concentration in the under load and under uniform load of simply supported shear lag effect Variable decomposition; and concentration to bear load and uniform load cantilever beam under shear lag effect of varying decomposi-tion.(3) ZiyangHanjiang continuous rigid frame bridge with a engineering background, the use of Midas/Civil 2010 and the finite element program (ANSYS), in the dead load and dead load+temperature load shear lag in both cases were studied; and analysis in these two web box to change a situation tilt of the box cantilever length, shear lag effect on what effect. Through analysis and comparison, box tilt and cantilever length of the web shear lag effect on box there is a certain influence, but the effect is not large. |
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