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American Steel Design
Section 2
2-76
Design Procedure
The following two design modes are available:
1.
Code Checking
The program compares the resistance of members with the applied
load effects, in accordance with the LRFD Method of the AISI
code. Code checking is carried out for locations specified by the
user via the SECTION command or the BEAM parameter. The
results are presented in a form of a PASS/FAIL identifier and a
RATIO of load effect to resistance for each member checked. The
user may choose the degree of detail in the output data by setting
the TRACK parameter.
2.
Member Selection
The user may request that the program search the cold formed steel
shapes database (AISI standard sections) for alternative members
that pass the code check and meet the least weight criterion. In
addition, a minimum and/or maximum acceptable depth of the
member may be specified. The program will then evaluate all
database sections of the type initially specified (i.e., channel,
angle, etc.) and, if a suitable replacement is found, present design
results for that section. If no section satisfying the depth
restrictions or lighter than the initial one can be found, the
program leaves the member unchanged, regardless of whether it
passes the code check or not.
The program calculates effective section properties in accordance
with the following Sections:
• B2.1, Uniformly Compressed Stiffened Elements
• B2.3, Webs and Stiffened Elements with Stress Gradient
• B3.1, Uniformly Compressed Unstiffened Elements
• B3.2, Unstiffened Elements and Edge Stiffeners with
Stress Gradient
• B4.2, Uniformly Compressed Elements with an Edge
Stiffener