AECT250-Lecture 9

AECT250-Lecture 9 - Lecture 9 Compression Members Combined...

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Lecture 9 - Page 1 of 11 Lecture 9 – Compression Members – Combined compression & Bending In Lecture 8, we discussed axially-loaded columns and compression members loaded through the centroid. This is referred to as “concentric” loading. In reality, columns and compression members are usually loaded off the centroid referred to as “eccentric” loading, i.e., moments applied. Eccentrically loaded columns are most common in corners or in asymmetrical loadings. Equally-loaded beam end reactions about the same axis offset each other while un-equal loads create moments as shown below: 32 K 20 K 20 K e P P Concentric Loading (no moment) Eccentric Loading (applied moment) M = 0 M = Pe Concentrically Loaded Column 20 K Eccentrically Loaded Column Beam end reaction
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Lecture 9 - Page 2 of 11 The LRFD addresses columns and compression members under combined compression and bending in the following: AISC Spec Chapter H (p. 16.1-38) AISC Part 6 In particular, AISC Spec H1 (p. 16.1-70) dictates the following interaction formulas: a) For 2 . 0 c r P P 0 . 1 9 8 + + cy ry cx rx c r M M M M P P b) For 2 . 0 < c r P P = 0 . 1 2 + + cy ry cx rx c r M M M M P P where: P r = Applied axial compressive load, KIPS P c = Available axial compressive strength of column, KIPS = φ c P n where φ c = 0.90 LRFD = c n P where c = 1.67 ASD
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This note was uploaded on 05/05/2009 for the course AE AE250 taught by Professor Hultenius during the Fall '08 term at SUNY Delhi.

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AECT250-Lecture 9 - Lecture 9 Compression Members Combined...

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