What are the structural classifications of abutment piers?

1. Pier types \x0d\ are classified according to stress characteristics \x0d\ 1, and gravity piers \x0d\ (1) Beam bridge gravity piers: rectangular piers, circular piers, pointed piers \x0d\ (2) Arch bridge gravity piers: ordinary piers and unidirectional piers. Hollow pier, pile-type pier, double-column pier, various flexible piers \x0d\ 2, abutment type \x0d\ 1, gravity abutment: according to the shape-rectangular abutment, U-shaped abutment, T-shaped abutment, ear wall abutment, rectangular buried abutment and cross buried abutment \ x0d \