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Section 2
2-11
Restrictions
This facility is currently available for Wide Flange shapes (W, M
& S), Channels, Tee shapes, Pipes and Tubes. It is not available
for Single Angles, Double Angles, members with the PRISMATIC
property specification, Composite sections (Wide Flanges with
concrete slabs or plates on top), or Double Channels. Also, the
stresses are calculated based on the rules for concentrated
torsional moments acting at the ends of the member.
2.3.8 Design of Web Tapered Sections
Appendix F of AISC-89 provides specifications for design of Web-
Tapered members. These specifications have been incorporated
into STAAD to perform code checking on web tapered wide flange
shapes. Member selection cannot be performed on web-tapered
members.
2.3.9 Slender compression elements
For cross sections with elements which fall in the category of
slender as per Table B5.1 of the AISC ASD code (the others being
compact and non-compact), the rules of Appendix B of the code
have been implemented. For stiffened compression elements, the
effective cross section properties are calculated and used. For
unstiffened compression elements, the allowable stresses are
reduced per the Appendix.
2.4 Design Parameters
The program contains a large number of parameter names which
are needed to perform designing and code checking. These
parameter names, with their default values, are listed in Table 2.1.
These parameters communicate design decisions from the engineer
to the program.
See Table
2.1 and
Section
5.47.1
The default parameter values have been selected such that they are
frequently used numbers for conventional design. Depending on