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Pedestrian Bridge Bearing

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I was asked to design the support buttresses for a 40 ft. long pedestrian bridge spanning over a gully.  The bridge has a camber of about 36” at midspan.  I ran an analysis of a pinned end and roller end.  The pinned end had a 48 kip thrust force.  The roller end had a 0.50” movement.  So I would like to detail a bearing condition of roller instead of pinned.  I never had the pleasure of working for a DOT or doing bridge work.  Are there any standard bearings I could specify that are readily available to provide a roller bearing for a cambered beam?  Are there any typical details someone can share with me showing a roller end bearing?

 

Thanks for any insight you may provide.

 

Rich