Test on transverse long cantilever for continuous box girder on the model bridge and its nonlinear analysis

In order to solve the problem of transverse cracking on box girder with long cantilever and based on similarity principle,model bridge with long transverse cantilever was firstly made and mode test was done.Nonlinear analysis method was applied in numeric analysis,and the nonlinear FEM model for bridge with long transverse cantilever was updated.The distribution of strains and deflection was analyzed under various loading grade,and compared with test results.The studies show that,along with the increase of load,the compressive strain at top area of web is obviously non-uniform in transverse direction.Compressive strain at loading area is larger than that at centerline of cross-section;while the load comes to a level,deflection at end of long cantilever is far larger than that at opposite point,and the transverse distribution of deflection is similar to that of strains at middle of mid-span.Model bridge is in bi-directional stress status with obvious loading effect at local area.