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Section 5
5-199
4. Program calculates V from the above equation. W is
obtained from the weight data provided by the user through the
DEFINE 1893 LOAD command. [See section 5.31.2.2 for
SELFWEIGHT, JOINT WEIGHT(s), etc. The weight data must
be in the order shown.]
5. The total lateral seismic load (base shear) is then distributed
by the program among different levels of the structure per the
IS: 1893(Part 1)-2002 procedures.
General format:
DEF
INE 1893 LOAD
ZON
E f
1
1893-spec
SEL
FWEIGHT
JOI
NT WEIGHT
joint-list WEI
GHT w
[See Section 5.31.2.2 for complete weight input definition]
1893-Spec= {RF
f2, I f3, SS f4, (ST f5), DM f6, (PX f7),
(PZ
f8), (DT f9)}
where,
Zone f
1
= Seismic zone coefficient. Refer Table 2 of
IS:1893(Part 1)-2002.
RF f
2
= Response reduction factor. Refer Table 7 of IS: 1893
(Part 1)-2002.
I f
3
= Importance factor depending upon the functional use
of the structures, characterized by hazardous
consequences of its failure, post-earthquake functional
needs, historical value, or economic importance. Refer
Table 6 of IS: 1893(Part 1)-2002.
SS f
4
= Rock or soil sites factor (=1 for hard soil, 2 for
medium soil, 3 for soft soil). Depending on type of
soil, average response acceleration coefficient S
a
/g is
calculated corresponding to 5% damping. Refer Clause
6.4.5 of IS: 1893 (Part 1)-2002.