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STAAD Commands and Input Instructions
Section 5
5-204
There are 2 stages of command specification for generating lateral
loads. This is the first stage and is activated through the DEFINE
IBC 2000 or 2003 LOAD command.
General Format
⎧2000 ⎫
DEFINE IBC ( ⎨ ⎬) (ACCIDENTAL) LOAD
⎩
2003
⎭
SDS f1 ubc-spec
SELFWEIGHT
JOINT WEIGHT
Joint-list
WEIGHT w
[See Section 5.31.2.2 for complete weight input definition]
ubc-spec = {
SD1 f2 S1 f3 IE f4 RX f5 RZ f6
SCLASS f7 (CT f8) (PX f9) (PZ f10) }
where,
f1 = Design spectral response acceleration at short periods. See
equation 16-18, Section 1615.1.3 of IBC 2000 and equation
9.4.1.2.5-1 of ASCE7-02
f2 = Design spectral response acceleration at 1-second period. See
equation 16-19, Section 1615.1.3. of IBC 2000 and equation
9.4.1.2.5-2 of ASCE7-02
f3 = Mapped spectral acceleration for a 1-second period. See
equation 16-17 of IBC 2000, and 9.4.1.2.4-2 of ASCE 7-02
f4 = Occupancy importance factor determined in accordance with
Section 1616.2 of IBC 2000 and 2003, and section 9.1.4
(page 96) of ASCE 7-02
f5 = The response modification factor for lateral load along the X
direction. See Table 1617.6 of IBC 2000 (pages 365-368) and
Table 1617.6.2 of IBC 2003 (page 334-337). It is used in
equations 16-35, 16-36 & 16-38 of IBC 2000