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Section 5
5-203
The seismic response coefficient, C
s
, is determined in
accordance with the following equation:
⎥
⎦
⎤
⎢
⎣
⎡
=
E
DS
s
I
R
S
C
………………. Eqn 16-35 of IBC 2000, Eqn 9.5.5.2.1-1 of ASCE 7-02
C
s
need not exceed the following:
T
I
R
S
C
E
D
s
⎥
⎦
⎤
⎢
⎣
⎡
=
1
……………. Eqn 16-36 of IBC 2000, Eqn 9.5.5.2.1-2 of ASCE 7-02
C
s
shall not be taken less than:
EDS
S
ISC 044.0
=
……..Eqn 16-37 of IBC 2000, Eqn 9.5.5.2.1-3 of ASCE 7-02
In addition, for structures for which the 1-second spectral
response, S
1
, is equal to or greater than 0.6g, the value of the
seismic response coefficient, C
s
, shall not be taken less than:
⎥
⎦
⎤
⎢
⎣
⎡
=
E
s
I
R
S
C
1
5.0
……………Eqn 16-38 of IBC 2000, Eqn 9.5.5.2.1-4 of ASCE 7-02
For an explanation of the terms used in the above equations, please
refer to the IBC 2000 and ASCE 7-02 codes.