Table 6   Behavior Coefficient of Buildings

 System of Structure Lateral Force Resisting System R

1

 Bearing Walls System:
in which the walls support all or the most parts of the vertical
loads, and resistance to seismic lateral force is provided by
shear walls.

a) Reinforced concrete shear walls

b) Reinforced masonry shear walls

 5

4
2 Simple Space Frame System:
in which the space frame with simple connections supports all
vertical loads, and resistance to seismic lateral forces is
provided by shear walls or bracings.		 a) Reinforced concrete shear walls

b) Bracings

c) Reinforced masonry shear walls

 7

7

5
3 Moment Resisting Space Frame System:
in which the space frame, alone, supports, all vertical loads and
seismic lateral forces (without shear walls or bracings).		 a) Steel moment resisting space frame

b) Reinforced concrete moment
    resisting space frame.

 6

5
4 Combined System of Moment Resisting Space Frame and
Shear Walls or Bracings:
In this system the space frame supports the vertical loads, and
resistance to seismic lateral forces is provided jointly by the
space frame and the shear walls or by the space frame and the
bracings.
The seismic lateral forces are distributed between the space
frame and the shear walls or between the space frame and the
bracings in proportion to their rigidities but in any case the frame
alone should be capable of supporting at least 25% of the
seismic  lateral forces.

a) Moment Resisting frame+reinforced
    concrete shear walls

b) Moment resisting frame+bracings

 8

8