The attached photo is for an expansion bearing on a pedestrian truss bridge. The masonry plate and elastomeric portion came as a unit, were installed over the anchor bolts. The truss was then set down and the plate on top of the bearings is welded to the end post of the truss. Both plates have slotted holes. I’ve never seen a masonry plate not bolted firmly to a pedestal. I checked the drawings and this is how it was designed with the exception that the top will be double-nutted (bridge is under construction). The plans say to leave the top nut loose enough to allow movement in the slotted holes. This doesn’t seem right to me, but I also have limited experience with pedestrian bridges. Am I the only one that believes this is a poor design?
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