The Analysis Of The Shear Lag Effect Of The Prestressed Concrete Continuous Rigid Frame Bridge

The Prestressed Concrete Continuous Rigid Frame Bridge (for short, PCCRFB) is widely constructed allover China, and is becoming a basic kind of bridge crossing great rivers. As a kind of mature bridge, there still some problems exists in PCCRFB, one of these problems is the Shear Lag Effect, which is considered as the Effective Wideness in the bridge design code JTG D62-2004.The reasons of the shear lag effect, the difference of the positive shear lag effect and the minus shear lag effect, and the bridge engineering problems caused by the shear lag effect are expatiated in detail. The calculation formulations of the shear lag effect is derived from the E.Reissner Variational Principle, at last the assumptions of E.Reissner Variational Principle are modified. The software ANSYS10.0 and GQJS are applied to calculate the factor of the shear lag effect of the simplified PCCRFB. On one side, the geometry parameters and the boundary conditions of the bridge structures are analyzed, one the other side, the type of the load are analyzed.At last, the analysis of shear lag effect of the combined structure of steel and concrete is put forward to illustrate the problem of the shear lag effect is a key problem needed to be solved for the new structure form.