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STAAD Commands and Input Instructions
Section 5
5-188
2. Program calculates the structure period T.
3. Program calculates C from appropriate UBC equation(s)
utilizing T.
4. Program calculates V from appropriate equation(s). W is
obtained from the weight data (SELFWEIGHT, JOINT
WEIGHT(s), etc.) provided by the user through the DEFINE
UBC LOAD command. 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
UBC procedures.
General format:
DEF
INE UBC (ACCIDENTAL) LOAD
ZON
E f
1
ubc-spec
SEL
FWEIGHT
JOI
NT WEIGHT
joint-list WEI
GHT w
MEM
BER WEIGHT
⎧UNI v v v
3
⎫
1 2
mem-list
⎨ ⎬
⎩
CON v
4
v
5
⎭
ELE
MENT WEIGHT
plate-list PRESS p
1
FLO
OR WEIGHT
YR
ANGE …
(see Section 5.32.4 for input description)
⎧ I f
2
⎫
⎪
RWX f
3
⎪
*
⎪ RWZ f ⎪ * ⎧K
4
f
6
⎫
ubc-spec =
⎨
S f
5
⎬ ubc-spec = ⎨I f⎬
7
for UBC 1994
⎪
(CT
f
9
)
⎪ for UBC 1985 ⎩(
TS f
8
)
⎭
⎪(PX
f
10
)
⎪
⎩(
PZ
f
11
)
⎭