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Unformatted text preview: CE 4401 Steel and Reinforced Concrete Design Steel BeamColumns  1 CE 4401 STEEL BEAMCOLUMNS: MEMBERS SUBJECTED TO COMBINED AXIAL FORCE AND FLEXURE AISC Manual Part 6 and AISC Specification Chapters B, C, D, E, F, H, J, L BeamColumn: 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 BeamColumns Figure of Axial Force plus Flexure Being Equivalent to an Eccentric Load CE 4401 Steel and Reinforced Concrete Design Steel BeamColumns  2 One of the main features of beamcolumns moment magnification through P effect. more moment more deflection more moment So: Figure of SecondOrder Effect on BeamColumn Deflection Called: P effect More generally: geometric nonlinearity or secondorder 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 BeamColumns  3 DESIGN OF BEAMCOLUMNS 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. H11a 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.
 Fall '09
 Shield

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