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American Steel Design
Section 2
2-20
Member selection cannot be performed on members whose section
properties are input as prismatic.
2.6.1 Member Selection by Optimization
Steel table properties of an entire structure can be optimized by
STAAD. The method used in the optimization, which takes place if
the SELECT OPTIMIZE command is specified, involves the
following steps.
See Section
5.47.4
a. CHECK CODE ALL
b. Modify the ratios
c. SELECT ALL
d. PERFORM ANALYSIS
e. SELECT ALL
An additional step of Grouping may be performed if the FIXED
GROUP and GROUP commands are provided (see section 5.48).
After the last step, a re-analysis is not automatically performed, so
users must ensure that they specify the analysis command
following the SELECT OPTIMIZE command.
2.6.2 Deflection Check With Steel Design
This facility allows the user to consider deflection as a criteria in
the CODE CHECK and MEMBER SELECTION processes. The
deflection check may be controlled using the three parameters DJ1,
DJ2 and DFF which are described in Table 2.1. Deflection is used
in addition to other strength and stability related criteria. The local
deflection calculation is based on the latest analysis results.
2.7 Truss Members
As mentioned earlier, a truss member is capable of carrying only
axial forces. So during the design phase, no time is wasted
calculating the allowable bending or shear stresses. From this
standpoint, if there is any truss member in an analysis (like
bracing or strut, etc.), it is advisable to declare it as a truss