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06-16-2010, 12:45 PM   #1
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## 4 by 6 Structural Load Question

maximum load for a 4 by 6 post

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06-16-2010, 01:06 PM   #2
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Quote:
 Originally Posted by cesar cortes maximum load for a 4 by 6 post
Under what conditions/placement ?

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 06-16-2010, 01:56 PM #3 Member   Join Date: Jul 2008 Location: NW of D.C. Posts: 5,990 Rewards Points: 2,000 See the first figure http://www.efunda.com/formulae/solid...ns/columns.cfm The Area Moment of Inertia = I = (b(h^3))/12 = 5.5(3.5^3)/12 = 19.7 inches^4 E is typically 0.8 to 2.2 MPSI For L = 6' and E = 800,000 my spreadsheet tells me 30,000 pounds. To quote Edwin Starr, "Good Gawd, y'all!" Last edited by Yoyizit; 06-16-2010 at 04:34 PM.
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06-16-2010, 02:08 PM   #4
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wood type?
wet condtions?
4 x 6 or 3.5 x 5.5?
grade of wood?
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 06-16-2010, 06:37 PM #5 Civil Engineer   Join Date: Mar 2009 Location: Boston Posts: 5,832 Rewards Points: 5,246 A post is a type of column. The allowable load on a column is usually controlled by buckling, unless the column is very short. Maximum allowable column loading when controlled by buckling is a function of the unbraced length, the eccentricity of the load, the slenderness ratio of the column, the material properties of the column, and the required safety factor. You cannot determine the allowable load on a column until you have established each of these factors.
 The Following User Says Thank You to Daniel Holzman For This Useful Post: Willie T (06-17-2010)
 06-17-2010, 08:55 AM #6 Member   Join Date: Jul 2008 Location: NW of D.C. Posts: 5,990 Rewards Points: 2,000 You could make a 1/10th scale model. Using .35", .55" and 7.2" the column should collapse at 'around' 300#.
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