The numbers are 15 And 3000 ackboard.com/webapps/assessment/review/reviewjsp?att
ID: 3259186 • Letter: T
Question
The numbers are 15 And 3000 ackboard.com/webapps/assessment/review/reviewjsp?attempt.id--6630922.1&cours; @6, Tr @ .folder Toshiba Q western civilization ® How to Annotate ar O How to Create You comprehensive Se, 22 ft Selected Answer [None Given Response Feedback: [None Given] ion 2 No. 1 grade of Douglas fir-larch is to be used for a series of floor beams 6 ft on center, spanning 15 ft. if the tota uniformly distributed load on each beam including the beam weight is 3000 lb. select the section with the least c sectional area based on bending strep. (show all steps and all your work) No. I grade of Douglas fir-larch is to be sed fora series of flor beams 6 t on center sectional area based on bending strewl sp and all your work) Selected Answer: None Given] Response Feedback: [None GivenExplanation / Answer
first determine the maximum applied moment
M = wL/8
=>
M = 3000 * 15/8
= 5625 lb.ft
= 67500 lb.in
next determine minimum size member
max bending stress is 1350 psi
rho = M/S
S = 1/6 bh^2
S = 1/5 * 2.5 * h^2
= 0.42h^2
=>
1350 = 67500/0.42h^2
h = 10.91’'
hense most common size is larger than 2.5’’ by 10.91’'
use section 3 x 16