L36_Column design - fall 10

L36_Column design - fall 10 - EAS 209-Fall 2010...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: EAS 209-Fall 2010 Instructors: Christine Human Lecture 36 Design of Columns under a Centric Load In practice the design of columns is based on empirical formulas. Todays Lecture: Consider design of steel, aluminum and wood columns Todays Homework: 12/20/2010 1 Lecture 36 Design of Columns Each point represents the measured stress at failure of a column buckling test specimen EAS 209-Fall 2010 Instructors: Christine Human Experimental data demonstrate that the mode of failure is highly dependent on slenderness ratio:- for short columns (small L e /r ) , cr is determined by the yield strength Y .- for long columns (large L e /r ) , cr follows Eulers formula and depends upon E .- for intermediate columns , cr depends on both Y and E . Most design specifications follow this observation, and formulas are specified within a defined range of applicability. Specification for Structural Steel ( AISC)-2005 12/20/2010 2 Lecture 36 Design of Columns EAS 209-Fall 2010 Instructors: Christine Human For AB use exponential expression to predict CR [ ] Y cr e Y ) / ( 658 . = where 2 2 ) / ( r L E e e = For BC use an Euler-based relation ( 29 2 2 / 877 . 877 . r L E e e cr = = At point B , Y e E r L 71 . 4 = and Y cr 39 . = To obtain all use a factor of safety of 1.67 12/20/2010 3 Lecture 36 Design of Columns Most widely used formulas for steel columns under a centric load Allowable stress design For short and intermediate columns For long columns EAS 209-Fall 2010...
View Full Document

Page1 / 11

L36_Column design - fall 10 - EAS 209-Fall 2010...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online