What is the significance of the Rw Value in the UBC code?
The UBC 1997 code defines Rw as a Numerical Coefficient representative of the inherent overstrength and global ductility capacity of lateral-force resisting systems.
It is to be used in the equation for computing base shear. Its values are dependent on the type of lateral-force resisting system in the building, such as whether the system is a Light-framed wall with shear panels or Shear wall made of concrete or a special moment resisting frame, etc.
Values of Rw are listed in Tables 16-N and 16-P of the UBC 1994 and 1997 codes.