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STAAD Commands and Input Instructions
Section 5
5-210
The base shear are distributed proportionally to the height if T≤ Tb
or with the quadratic equation mentioned if T > Tb.
The distributed base shears are subsequently applied as lateral
loads on the structure.
General Format
DEFINE CFE LOAD
ZONE f1 cfe-spec
SELFWEIGHT
JOINT WEIGHT
Joint-list
WEIGHT w
[See Section 5.31.2.2 for complete weight input definition]
cfe-spec = ⎧ QX f2 ⎫
⎥
QZ f3 ⎪
⎥
GROUP f4 ⎥
⎥
STYP f5 ⎥
⎨ (
REGULAR) ⎬
⎥ (
TS f6) ⎥
⎥ (
PX f7) ⎥
⎩ (
PZ f8) ⎭
where,
f1 = Zone number specified in number such as 1, 2, 3 or 4
f2 = seismic behavior factor of the structure along X direction as a
parameter according 3.2.4.
f3 = seismic behavior factor of the structure along Z direction as a
parameter according 3.2.4.
f4 = Group of structure entered as A or B
f5 = Soil type entered as 1 or 2 or 3
REGULAR optional parameter is entered to consider the structure as
a regular structure. By default, all structures are considered as
irregular.
f6 = site characteristic period