7%20Beam-Column%20Lecture - CE 4401 Steel and Reinforced...

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Unformatted text preview: CE 4401 Steel and Reinforced Concrete Design Steel Beam-Columns - 1 CE 4401 STEEL BEAM-COLUMNS: MEMBERS SUBJECTED TO COMBINED AXIAL FORCE AND FLEXURE AISC Manual Part 6 and AISC Specification Chapters B, C, D, E, F, H, J, L Beam-Column: combined axial force and flexure (and shear) Could have uniaxial bending (about a single axis), or biaxial bending (bending about both axes). Ultimate Strength of Beam-Columns Figure of Axial Force plus Flexure Being Equivalent to an Eccentric Load CE 4401 Steel and Reinforced Concrete Design Steel Beam-Columns - 2 One of the main features of beam-columns moment magnification through P- effect. more moment more deflection more moment So: Figure of Second-Order Effect on Beam-Column Deflection Called: P- effect More generally: geometric nonlinearity or second-order effects Deflection no longer relates linearly to load, even for a linear elastic material Discussion of braced versus unbraced frames will be done separately. Discussion of behavior due to axial tension plus flexure will be done on board. CE 4401 Steel and Reinforced Concrete Design Steel Beam-Columns - 3 DESIGN OF BEAM-COLUMNS AISC H1 Interaction between axial force and bending moment (both cause axial stress) is handled through the use of the AISC LRFD interaction equation Axial Tension Plus Flexure If you have combined flexure and tension: If 2 . n t u P P , 1 9 8 + + ny b uy nx b ux n t u M M M M P P Eq. H1-1a If 2 . < n...
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This note was uploaded on 06/09/2010 for the course CIVIL 4401 taught by Professor Shield during the Fall '09 term at University of Minnesota Crookston.

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7%20Beam-Column%20Lecture - CE 4401 Steel and Reinforced...

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