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Wood tables and columns problems

J.1 Use table 5.10 to select the smallest possible cross-section for floor joist with LL = 40psf and DL = 10psf, max LL deflection = L/360

  1. spacing 24″o.c, span=14′
  2. spacing 16″o.c., span = 14′
  3. spacing 12″ o.c., span=14′

J.2 Use table 5.11 to select the smallest possible cross-section for rafters with LL=20psf and DL = 20psf, max LL deflection = L/240

  1. spacing 24″o.c, span=14′
  2. spacing 16″o.c., span = 16′
  3. spacing 12″ o.c., span=18′

J.3 Using ASD method, find the allowable axial compression load for the following wood columns:

  1. 6×6, unbraced length 15′ with Doug-fir Larch, No. 2 grade
  2. 8×8, unbraced length 20′ with Doug-fir Larch, Dense No. 1 grade

J.4 Use table 6.1 to find the smallest SQUARE cross-section needed for the following conditions:

Note: since you must use table 6.1, you must be assuming Doug-Fir Larch, No. 1 grade

  1. 15′ unbraced length, P=20k
  2. 20′ unbraced length, P = 30k

J.5 Combined Axial and Bending loads:  A WLF exterior wall is made with 2×6 studs and are each exactly 10′ tall.   The wind load on the wall is 20.8psf on the wall surface, studs are 16″ o.c., and the gravity load on the wall is 600 #/ft of wall length.  The exterior sheathing is nailed at 8″o.c at each stud.   Investigate the studs for combined action of compression plus bending using the ASD method.

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