1613.5.6 Determination of seismic design category.

All structures shall be assigned to a seismic design category based on their risk category determined in accordance with Table 1604.5 and the design spectral response acceleration parameters, SDS and SD1 , determined in accordance with Section 1613.5.4 or the site- specific procedures of ASCE 7-10. Each building and structure shall be assigned to the more severe seismic design category in accordance with Table 1613.5.6(1) or 1613.5.6(2), irrespective of the fundamental period of vibration of the structure, T.

Table 1613.5.6(1)
Seismic Design Category Based on Short-Period(0.2 Second) Response Accelerations

 

Value of SDS	Risk Categorya
	I & II	III	IV
SDS < 0.167g	A	A	A
0.167g < SDS < 0.33g	B	B	C
0.33g < SDS < 0.50g	C	C	D
0.50g < SDS	Da	Da	Da

 

a.    Requirements for Seismic Design Categories E and F have been eliminated from the New York City Building Code as such categories do not apply in New York City. References to these Seismic Design Categories can be found in ASCE 7-10.

Table 1613.5.6(2)
Seismic Design Category Based on 1-SecondPeriod Response Accelerations

 

Value of SD1	Risk Categorya
	I & II	III	IV
SD1 < 0.067g	A	A	A
0.067g < SD1 < 0.133g	B	B	C
0.133g < SD1 < 0.20g	C	C	D
0.20g < SD1	Da	Da	Da

 

a.    Requirements for Seismic Design Categories E and F have been eliminated from the New York City Building Code as such categories do not apply in New York City. References to these Seismic Design Categories can be found in ASCE 7-10.