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Section 5
5-303
where,
Sa = Spectrum ordinate
ξ = damping ratio
A, B = Constants
The constants A and B are determined using two known spectrum
ordinates Sa
1
& Sa
2
corresponding to damping ratios ξ
1
and ξ
2
respectively for a particular time period and are as follows :
A =
Sa Sa
ee
11 22
12
1
2
ξ
ξ
ξξ
ξ
ξ
−
−
−
−
B =
(
)
ξξ
ξξ
ξξ
ξξ
12 2 1
1
Sa e Sa e
ee
1
2
12
−−
−−
−
−
2
where, ξ
1
< ξ < ξ
2
3. The storey drift in any storey shall not exceed 0.004 times the
storey height as per Clause 7.11.1. To check this, the following
command should be given after the analysis command.
PRI
NT STOREY DRIFT
A warning message will be printed if storey drift exceeds this
limitation. If any soft storey (as per definition in Table 5 of
IS:1893-2002) is detected, a warning message will be printed in
the output.