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STAAD Commands and Input Instructions
Section 5
5-400
5.48 Group Specification
Purpose
This command may be used to group members together for analysis
and steel design.
General format:
(FIX
ED GROUP)
GRO
UP prop-spec MEMB memb-list (SAME AS i
1
)
⎧AX ⎫ = Cross-section area
prop-spec =
⎨SY ⎬ = Section modulus in local y-axis
⎩
SZ
⎭
= Section modulus in local z-axis
Description
This command enables the program to group specified members
together for analysis based on their largest property specification.
However, if member number i
1
is provided in the SAME AS
command, the program will group the members based on the
properties of i
1
.
When FIXED GROUP is omitted, the GROUP command is usually
entered after the member selection command, and the selected
members will be grouped immediately and the new member
properties will be used in any further operations. After the
GROUPing is completed, the GROUP commands are discarded and
will not be used again. Further grouping will be done only if a new
GROUP command is encountered later.
If the FIXED GROUP option precedes the group data, the
specified grouping will be retained in memory by the program and
will be used in subsequent SELECT commands. No "GROUPing"
will occur unless a "SELECT (MEMBER or ALL or
OPTIMIZED)" command is performed. However, grouping will be
performed with every subsequent SELECT command.