Study on shear-lag effects of continuous rigid-frame box girder bridge with single box three rooms

According to the continuous rigid-frame box girder bridge with single box three rooms,creates two models which considered the interaction between pile and soil.One is ta- per section 3D beam element model,the other is 3D compounding model with solid element and shell element.This paper analyzes the shear-lag effects under surface load and focus load and discusses the different impact to dynamic analysis of these two models.The result shows that under static loading,the shear effects of boxing beam is notable,and the taper section 3D beam element model which considered the interaction between pile and soil has higher precision and efficiency.The obtained analysis results have great practical values for the design of related engineering structures.