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AECT250-Lecture 8

# AECT250-Lecture 8 - Lecture 8 Compression members Axially...

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Lecture 8 - Page 1 of 9 Lecture 8 – Compression members – Axially loaded Compression members are not limited to just columns. Trusses and bracing members may also be designed as compression members. We will look at compression members subject to axial compression ONLY (i.e., no other stresses). Essentially, this means that loads act thru the centroid of the member along the longitudinal length of the member as shown below: Compression members are designed in accordance with: AISC Spec. Chapter E p. 16.1-32 AISC Part 4 Axial Load

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Lecture 8 - Page 2 of 9 A compression member’s strength is GREATLY determined by its unbraced length, referred to its “Effective Length” KL where: K = Effective length factor = see AISC p. 16.1-240 = usually 1.0 assuming ends are pinned L = Distance between lateral bracing, inches. The design strength of an axially-loaded compression member = φ c P n LRFD = c n P ASD where: φ c = 0.90 c = 1.67 P n = nominal compressive strength = A g F cr A g = Gross cross-sectional area, in 2 = From properties F cr = Elastic critical buckling stress = y F F F e y 658 . 0 IF y F E r KL 71 . 4 min = 0.877F
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AECT250-Lecture 8 - Lecture 8 Compression members Axially...

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