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American Steel Design
Section 2
2-56
2.14 Steel Design per AISC/LRFD Specification
The 2
nd
and 3
rd
editions of the American LRFD code have been
implemented. The commands to access those respective codes are:
For the 3
rd
edition code –
PARAMETER
CODE LRFD
or
PARAMETER
CODE LRFD3
For the 2
nd
edition –
PARAMETER
CODE LRFD2
2.14.1 General Comments
The design philosophy embodied in the Load and Resistance
Factor Design (LRFD) Specification is built around the concept of
limit state design. Structures are designed and proportioned taking
into consideration the limit states at which they would become
unfit for their intended use. Two major categories of limit-state are
recognized--ultimate and serviceability. The primary
considerations in ultimate limit state design are strength and
stability, while that in serviceability is deflection. Appropriate
load and resistance factors are used so that a uniform reliability is
achieved for all steel structures under various loading conditions
and at the same time the chances of limits being surpassed are
acceptably remote.