Table 3    Response Modification Coefficient for Structural Systems, R

Basic Structural System

Description of  Latcral Force Resisting System

R

a. Bearing Wall
    System

1.   Light framed walls with shear panels
       ⅰ)  Plywood walls for structures, 3 storeys or less
       ⅱ) All other light framed walls
2.   Shear walls
       ⅰ) Concrete
       ⅱ) Masonry
3.   Light steel framed bearing walls with tension only bracing
4.   Braced frames where bracing carries gravity loads
       ⅰ)  Steel
       ⅱ) Concrete
       ⅲ) Heavy timber


8
6

6
6
4

6
4
4

b. Building Frame
    System

1.   Steel eccentric braced frame (EBF)
2.   Light framed walls with shear panels
       ⅰ) Plywood walls for structures 3-storeys or less
       ⅱ) All other light framed walls
3.   Shear walls
       ⅰ) Concrete
       ⅱ) Masonry
4.   Concentric braced frames (CBF)
       ⅰ)  Steel
       ⅱ) Concrete
       ⅲ) Heavy timber

10

9
7

8
8

8
8
8
c. Moment Resisting
    Frame System

1.   Special moment resisting frames (SMRF)
       ⅰ)  Steel
       ⅱ) Concrete
2.   Intermediate moment resisting frames (IMRF), concrete
3.   Ordinary moment resisting frames (OMRF)
       ⅰ)  Steel
       ⅱ) Concrete


12
12
8

6
5
d. Dual System

1.   Special moment resisting frames (SMRF)
       ⅰ)  Concrete with steel or concrete SMRF
       ⅱ) Concrete with steel OMRF
       ⅲ) Concrete with concrete IMRF
       ⅳ) Masonry with steel or concrete SMRF
       ⅴ) Masonry with steel OMRF
       ⅵ) Masonry with concrete IMRF
2.   Steel EBF
       ⅰ)  With steel SMRF
       ⅱ) With steel OMRF
3.   Concentric braced frame (CBF)
       ⅰ)  Steel with steel SMRF
       ⅱ) Steel with steel OMRF
       ⅲ) Concrete with concrete SMRF
       ⅳ) Concrete with concrete IMRF


12
6
9
8
6
7

12
6

10
6
9
6
e. Special Structural
    Systems

See Sec 1.3.2, 1.3.3, 1.3.5