The related quasi-static tests verify that the top lateral displacements of RC bridge columns suffering from flexural failure consist of bending deformation and bar bond slip deformation（bar pulling out deformation）.To further investigate the deformation components under earthquake loading and their influential factors

Lehman and LI Guiqian′s test results are simulated for hysteretic curves and deformation components on the platform of OpenSees

with the model of fiber beam-column element adding zero-length section element.Then the prototype models are built for nonlinear dynamic analysis

considering near-fault ground motions and far-fault ground motions.Parameters of structural response（the maximum lateral drift ratio and displacement ductility factor）and structural characteristics（the aspect ratio and longitudinal reinforcement ratio）are taken as influential factors.The results show that the bar bond slip deformation component in total lateral displacement increases with the growing of the maximum lateral drift ratio and displacement ductility factor

and decreases with the increasing of the aspect ratio and longitudinal reinforcement ratio.In addition

the numerical models considering the bar bond slip will magnify the seismic responses of RC bridge columns by comparison with that ignoring the bar bond slip.