# Design of Steel Members per AISC 360-16

The design of steel members according to AISC 360-16 is explained in detail under this title.

There are 2 main principles used in AISC 360-16.

Symbols

Em = Combined applied design force on the horizontal and vertical seismic load effects
Ra = Required strength using ASD load combinations
Ru = Required strength using LRFD load combinations
Rn = Nominal strength of the applicable force transfer mechanism
Eh = Horizontal seismic load effect
Ev = Vertical seismic load effect
Φ = Resistance factor
Ω = Safety factor

1 - Design for Strength Using Load and Resistance Factor Design (LRFD)

The required strength of members, determined by the Load and resistance factor design (LRFD) load combinations, does not exceed the design strength of the member. The design strength of the member is determined by the equation given below. • 1.4D

• 1.2D + 1.6L + 0.5(Lr or S)

• 1.2D + 1.6(Lr or S) + (L or 0.5W)

• 1.2D + 1.0W + L + 0.5(Lr or S)

• 0.9D + 1.0W

• 1.2D + Ev + Eh + L + 0.2S

• 0.9D - Ev + Eh

2 - Design for Strength Using Allowable Strength Design (ASD)

The required strength of members, determined by the Allowable Strength Design (ASD) load combinations, does not exceed the allowable strength of the member. The design strength of the member is determined by the equation given below. • D

• D + L

• D + (Lr or S)

• D + 0.75L + 0.75(Lr or S)

• D + 0.6W

• D + 0.75L + 0.75(0.6W) + 0.75(Lr or S)

• 0.6D + 0.6W

• 1.0D + 0.7Ev + 0.7Eh

• 1.0D + 0.525Ev + 0.525Eh + 0.75L + 0.75S

• 0.6D - 0.7Ev + 0.7Eh JavaScript errors detected