ME85-Lecture28

ME85-Lecture28 - Who wants to drop a HW $1000 question...

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Unformatted text preview: Who wants to drop a HW ? $1000 question $10,000 Question $100,000 Question $1000,000 Question Design of Columns Under Centric Load • Previous analyses assumed stresses below the proportional limit and initially straight, homogeneous columns • Experimental data demonstrate- for large L e /r, σ cr follows Euler’s formula and depends upon E but not σ Y .- for intermediate L e /r, σ cr depends on both σ Y and E . - for small L e /r, σ cr is determined by the yield strength σ Y and not E . Design of Columns Under Centric Load Structural Steel American Inst. of Steel Construction • For L e /r > C c ( ) 92 . 1 / 2 2 = = = FS FS r L E cr all e cr σ σ π σ • For L e /r < C c ( ) 3 2 2 / 8 1 / 8 3 3 5 2 / 1 ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ − + = = ⎥ ⎥ ⎦ ⎤ ⎢ ⎢ ⎣ ⎡ − = c e c e cr all c e Y cr C r L C r L FS FS C r L σ σ σ σ • At L e /r = C c Y c Y cr E C σ π σ σ 2 2 2 1 2 = = Aluminum Aluminum Association, Inc....
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This note was uploaded on 01/21/2012 for the course C 85 taught by Professor Papadopoulos during the Spring '08 term at Berkeley.

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ME85-Lecture28 - Who wants to drop a HW $1000 question...

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