Type

Type or Arrangement of Resisting Elements

Value of γ

1

Building with a ductile moment-resisting space frame with the capacity to resist the total required force.
Buildings with a dual structural system consisting of a complete ductile moment-resisting space frame and ductile flexural walls designed in accordance with the following criteria:

The frames and ductile flexural walls shall resist the total lateral force in accordance with their relative rigidities considering the interaction of the flexural walls and frames. In this analysis the minimum shear in the frame must be at least 25 percent of the total base shear.

Buildings with a dual system consisting of a complete ductile moment-resisting space frame and shear walls or steel bracing designed in accordance with the following criteria:

The shear walls or steel bracing acting independently of the ductile moment-resisting space frame shall resist the total required lateral force.
The ductile moment-resisting space frame shall have the capacity to resist not less than 25 percent of the required lateral force, but in no case shall the ductile moment-resisting space frame have a lower capacity than that required in accordance with the relative rigidities.

0.3

2

Buildings with ductile flexural walls and buildings with ductile framing systems not otherwise classified in this Table 1 or 3.

0.4

3

Buildings with a dual structural system consisting of a complete ductile moment-resisting space frame with masonry infilling designed in accordance with the following criteria:

The wall system comprising the infilling and the confining elements acting independently of the ductile moment-resisting space frames shall resist the total lateral force.
The ductile moment-resisting space frame shall have the capacity to resist not less than 25 percent of the required lateral force.

0.5

4

Buildings (other than Types 1, 2 and 3) or reinforced concrete, steel, or reinforced masonry shear walls.

0.5

5

Buildings of unreinforced masonry and all other structural systems except Types 1 to 4 inclusive and those set forth.

0.8

6

Elevated tanks plus contents on 4 or more crossbraced legs and not supported by a building.

1.0