Project Phase 3

 

Check the components in your wood structure that carry the largest loads.  For the sample house this would include:

1.   ceiling joist 2x8 bending with D, L Lr
2.   floor/ceiling joist 2x10 bending with D, L Lr
3.   rafter 2x8 bending with D, Lr, S
4.   stud in first-floor interior wall 2x4 axial compression with D, Lr, S, L
5.   stud in first-floor exterior side wall 2x6 axial compression and bending with D, Lr, S, L, W
6.   connection between first-floor interior wall stud and bottom plate 2x4 bearing with D, Lr, S, L

Utilize the adjusted design values that you derived in Phase 2 or derive new ones.  If the trial member size used in Phase 1 is too small, find a satisfactory member size.  Or, if the trial size is excessive, suggest a cheaper alternative.  If you are dealing with a custom structure or a modification of the sample house, load calculations for the sample house are provided for comparison.

Please submit a printed or emailed report (or memo) by class time next Tuesday, April 2.  Please include a summary table with the following information.  Detailed stress calculations (similar to the chapter 6 and 7 homework derivations) can be included in the body of the report or in appendices.

  1. a list of the components you analyzed  (where was the component in the structure?)
  2. the trial member size for each component  (2x4, 2x10, etc)
  3. whether or not the trial member size was satisfactory; if the trial size was too large or too small, list a better alterative
  4. actual stress(es) (axial tension, axial compression, bending, bearing, etc) versus adjusted design value(s) for the controlling load combination for each component  (using homework problem 7.8 as an example: fb = 1,039 psi ≤ 1,275 psi  ✓  for controlling load combination (D+Lr))

 

Alternatives to try in the future