Seismic Use Group (See Table 3)

I

II

III

Design Short Period Response

S_DS < 0.167g

A

A

A

0.167g ≤S_DS < 0.33g

B

B

C

0.33g ≤S_DS < 0.50g

C

C

C

0.50g ≤S_DS

D

D

D

Design 1 second Period Response

S_D1 < 0.067g

A

A

A

0.067g ≤S_D1 < 0.133g

B

B

C

0.133g ≤S_D1 < 0.20g

C

C

D

0.20g ≤S_D1

D

D

D

Mapped 1 second Period Response

S₁ > 0.75g

E

E

F