Finite Element Analysis And Photoelastic Experimental Research Of Shear Lag In Large Cantilever Box Girder Bridge

In recent years, as the increasing of traffic volume, the bridge deck is becoming more and more wide, and large cantilever box girder bridge becomes an important trend.In this article, the large cantilever continuous box girder bridge was established its finite element model by ANSYS, and its shear lag mechanics characteristic under different loads was studied; and its experiment model was produced, and also the photoelastic experimental research based on experimental stress analysis of three-dimensional photoelastic theory was carried on. The main work of the paper is as follows:1. Finite element model of one large cantilever prestressed concrete box girder bridge was established, and several aspects of research were carried on: the lengthways and crosswise force analysis of structures, the analysis of shear lag mechanics characteristic of box girders and contrast studies with the code, the research of shearing force distribution rules, etc.2. The experimental principle,method and result analysis theory of photoelasticity experiment were introduced. On the basis of the three-dimensional stress analytical method of the photoelasticity experiment, large cantilever concrete box girder bridge's photoelasticity experiment model was made, and the model was studied under most disadvantageous load conditions.3. Finite element analysis and photoelastic experimental research results were compared, and shear lag of large cantilever box girder bridge under two research methods was studied.The results shows that shear lag characteristics of a large cantilever box girder and an ordinary box girder are different, and compared with the values according to the code, the effective flange width of large cantilever box girder bridges of finite element analysis is generally smaller. The research results of this article can be referenced by engineering.