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STAAD Commands and Input Instructions
Section 5
5-196
αi is calculated from the weight provided by the user in Define AIJ
Load command.
Seismic coefficient of floor Ci is calculated using appropriate
equations
Ci = Z Rt Ai Co
Where,
Z = zone factor
Co = normal coefficient of shear force
Ai = 1 + ( 1 / √αi - αi ) 2T/ ( 1 + 3T )
The total lateral seismic load is distributed by the program among
different levels.
General Format
DEFINE AIJ LOAD
ZON
E f1 ubc-spec
SEL
FWEIGHT
JOI
NT WEIGHT
Joint-list WEI
GHT w
[See Section 5.31.2.2 for complete weight input definition]
ubc-spec = (I f2, CO f3, TC f4)
Where, f1, f2, f3and f4 are Zone factor, Ratio of Steel Part,
Normal coefficient of shear force and Value needed for calculation
of Rt.
General format to provide Japanese Seismic load in any load case:
LOAD i
AIJ
LOAD {X/Y/Z} (f)
Where, i and f are load case number and factor to multiply
horizontal seismic load respectively.