(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Dense No 1 grade of Douglas Fir-Larch, 6x12 is to be used as a simple beam spanning 10 feet with a 2 feet overhang. The beam has the loading shown in the sketch I've attached. Determine the maximum value of the concentrated load "P" to maintain the structural integrity associated with bearing. The beam rest on 4x12 members at both supports.

2. Relevant equations

fv= VQ/Ib

fb= Mc/I

fc[itex]\bot[/itex] = bearing/common area

3. The attempt at a solution

I found these for the 4x12:

S=73.83

I= 415.3

A=39.38

Q=72

c=6

fc[itex]\bot[/itex] =625

common area = 3.5(5.5)???

bearing=12031.25???

I'm not sure if this is right? So the max "P" would be 12031.25#?

or Fc[itex]\bot[/itex] = 625 for 2-4in boards and Fc[itex]\bot[/itex] = 730 for 5" and bigger

730= V/3.5x3.5 - V=8942.5

625= V/3.5x3.5 - V=7656.25

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# Homework Help: Simple beam

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