Experimental Study On Shear Lag Of Curved Box Girder Under Earthquake

In modern bridge construction,curved bridges have been used more frequently.In the construction of the current curve bridge,curved box girder bridge is used more frequentl than other forms of bridge.Curved box girder main advantage lies in its bending stiffness when twisted,are lighter weight and construction and use of the relatively high stability.The advantages of the curved box girder is that it has lighter weight and torsional bending stiffness and high stability in the construction.However,the shear lag effect disappers in curved girder bridge,due to the bending and torsion coupling effect which come from the curvature of the curved box girder,and the shear lag effect is more significant from this bending and torsion coupling effects.In recent years,study about shear lag effect of curved box is more than the other,most scholars study shear lag effect in curved box girder under static load effect produced.However,the study of shear lag effect in curved box is just begaining under dynamic loading effects.The materials are important to the accuracy of the Prestressed Concrete Curved Box which is under earthquake.To solving these problems,we do the work of the following aspects:1.In this paper,a practical engineering Prestressed Concrete Curved Box Girder Bridge is selected.we have selected three different seismic waves from obtaining.Two of the typical wave,the one is Tianjin wave and the other is El-centro wave.Another is based on the actual site of the recorded seismic wave(which is named artificial waves).Curved box girder is studied to shear lag effect under three earthquake by ANSYS.2.This paper selects three different constitutive model of concrete constitutive model of prestressed reinforcement.Using history analysis method to analyze the dynamic response of curved box girder which choose from three different constitutive model under three kinds of seismic waves to get the shear lag effect of the nodes of the cross-sectional top.Analysising the shear lag of cross-sectional distribution of the roof of the prestressed concrete curved box girder which uses three constitutive models.It also analyzes the node of the shear span section of the roof and the inside of the junction with time changding.3.In this paper,the conclusions show that When the earthquake uses Tianjin wave,El-centro wave and artificial wave to study the shear lag effect of prestressed concrete boxgirder curved with finite element analysis.Using Hognestad concrete constitutive model is more appropriate.