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Section 5
5-245
5.32 Loading Specifications
Purpose
This section describes the various loading options available in
STAAD. The following command may be used to initiate a new
load case.
LOA
DING i
1
(LOADTYPE LIVE REDUCIBLE) (any load title)
i
1
= any unique integer number (up to five digits) to identify the
load case. This number need not be sequential with the
previous load number.
LOADTYPE Live Reducible = this option enables a user to reduce
a floor live load according to the provisions of UBC 1997,
IBC 2000 and IBC 2003 codes. For details, see section 5.32.4
of this manual.
The LOADING command initiates a new load case. Under this
heading, all different loads related to this loading number can be
input. These different kinds of loads are described in the remaining
sub-sections below.
Note: For Mass Model Loading in Dynamics please read Mass Modeling in Section
1.18.3 carefully. For the purpose of entering the mass distribution for the first dynamic
load case, use the following sections, 5.32.1 through 5.32.4 plus 5.32.9.
The purpose of the mass modeling step is to create lumped masses at the joints that the
eigensolution can use. The member/element loading is only a convenience in generating
the joint masses. Analytically the masses are not in the elements but are lumped at the
joints.
The absolute value of joint loads or loads distributed to joints from member/element
loadings will be treated as weights. The moments applied to member/elements or
computed at joints as a result of member/element loadings will be ignored. Only
moments (actually weight moment of inertia, force-length
2
units) applied in the Joint