The Shear Bracket with components of bracket and rubber bearing which provide the horizontal resistance when the bridge is under earthquake. And the rubber bearing provide the damper effect which reduce the impact effect.
The bracket and lower anchor plate is connected by bolt, so the Shear Bracket can be replaced if the bracket is damaged after earthquake.
Take horizontal loading only:
The Shear Bracket does not take any vertical loading; so the shear bracket do not affect the vertical loading distribution for bearing.