In order to improve the earthquake disaster prevention and mitigation capabilities of multi-span continuous girder bridge

the transverse pounding effects of this type of bridge during earthquakes was studied.Taking Hanjiang River Bridge in Chao’an of Guangdong Province as a research object

the seismic transverse pounding calculation model was established.The nonlinearity of the seismic isolation bearings and the interaction between piles and soil were also considered in this model.On the basis of the proposed numerical model

the characteristics and the effects of transverse pounding on seismic responses of the bridge structures were first presented.Then a parametric analysis was conducted on the key factors of the contact stiffness and the initial gap between the girder and the retainer.Finally

the pounding mitigation method of rubber bumpers was suggested and the thickness effect of the bumpers was discussed.The results indicate that:（1）the transverse pounding can reduce the relative displacement between the girder and the piers

but at the same time the internal forces of the piers increase and the difference of seismic force between the piers turns out to be even bigger;（2）the increase of the contact stiffness causes a decrease of the relative displacement between the girder and the piers

but an excessive stiffness value will give rise to great internal forces in the piers;（3）the effects of the initial gap have some uncertainty

but in general

the pounding forces and the piers’ internal forces are larger when the initial gap is getting smaller;（4）rubber bumpers can significantly reduce the pounding force and the bending moments at pier bottoms

and it is suggested to appropriately increase the thickness of bumpers in compliance with other project conditions.