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 A suggested pier labeling scheme for walls with openings is given in Figure 1:

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Figure 1 - Pier labeling scheme

• Additional information is available through Help > Documentation > Shear Wall Design > General Design Information.
  
  Note the following about the wall pier labeling scheme shown in Figure 1a:
• Wall piers are always associated with the story level directly above them.
  Thus, in Figure 1a, the upper level wall piers are associated with the Roof
  level and the lower level wall piers are associated with the 2nd level. Because
  the wall piers are associated with story levels, wall pier labels can repeat
  at different levels, as shown in the figure.
• When we refer to wall pier P1 at the Roof level in Figure 1a, we are referring
  to the pier across the entire width of the wall that is made up of the
  five area objects given the pier label P1. Similarly, pier P2 at the Roof level
  is made up of the two area objects to the left of the door opening.
• Wall pier design is performed at the top and bottom of each pier. Thus, for
  wall pier P2 at the Roof level, design is performed at the top and bottom of
  the door opening. No design is performed near the midheight of the door
  opening because the design is done at the top and bottom of the wall pier,
  not the top and bottom of each area object that makes up the wall pier.
• Wall pier forces are reported at the top and bottom of each pier. Thus, for
  wall pier P2 at the Roof level, wall pier forces are reported (printed) for locations
  at the top and bottom of the door opening. For graphic representation
  on the model, the forces are plotted at the top and bottom of the pier
  and connected with a straight line. For this reason, pier label shall not be 
  assigned to wall elements when their top or bottom joints are not aligned horizontally. 
  In other words, top and bottom joints must have the same z coordinates, respectivley.

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