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Section 5
5-211
f7 = Optional Period of structure (in sec) in X-direction to be
used as fundamental period of the structure instead of the
value calculated by the program using Raleigh-Quotient
method
f8 = Optional Period of structure (in sec) in Z direction (or Y if
SET Z UP is used) to be used as fundamental period of the
structure instead of the value calculated by the program using
Raleigh-Quotient method
General format to provide RPA Seismic load in any load case:
LOAD i
CFE LOAD {X/Y/Z} (f)
where i and f are the load case number and factor to multiply
horizontal seismic load respectively.
Examples
UNIT KGS METER
DEFINE CFE LOAD
ZONE 2 QX .5 QZ 0.9 STYP 2 GROUP B TS 0.2
SELFWEIGHT
MEMBER WEIGHT
1 TO 36 41 TO 50 UNI 300
JOINT WEIGHT
51 56 93 100 WEIGHT 1440
101 106 143 150 WEIGHT 1000
FLOOR WEIGHT
YRA 11.8 12.2 FLOAD 400 -
XRA -1 11 ZRA -1 21
LOAD 1 ( SEISMIC LOAD IN X DIRECTION )
CFE LOAD X 1.0
LOAD 2 ( SEISMIC LOAD IN -Z DIRECTION )
CFE LOAD Z -1.0