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Assignment #7
Problems: all but 7A from Ambrose & Tripeny, Chapter 8, pgs 242, 254, 263, 264.
Note: Problems marked with a * have been altered with respect to the problem stated in the text.
Problem 6.2.A. Using the ASD method, find the allowable axial compression load for the
following wood column. Use Douglas fir-larch, No. 2 grade. Note: This is dimensioned
lumber < 4 inches thick. (wood column analysis)
Nominal Size
(in.)
Unbraced
Length ( ft)
Unbraced
Length (m)
4 x 4
8
2.44
Partial answers to check with: Pallowed = 6.8 kip.
Problem 6.2.D.* Using the ASD method, find the allowable axial compression load from a
seven day construction load for the following glu-lam wood column of Douglas fir-larch, No. 2
Southern Pine grade. Fc = 1500 psi, E = 1,400,000 psi (Actual size of 10 x 10 is 9.25”x9.25”)
(wood column analysis)
Nominal Size
(in.)
Unbraced
Length ( ft)
Unbraced
Length (m)
10 x 10
14
4.27
Partial answers to check with: Fc’ = 1387.5 psi.
Problem 6.2.F. USE US UNITS. Select square column section of Douglas fir-larch, No. 1 grade
from Table 6.1, for the following data. (wood column design)
Required Axial
Load (kips)
Required Axial
Load (kN)
Unbraced
Length ( ft)
Unbraced
Length (m)
50
222
12
3.66
Partial answers to check with: Padequate = 79.0 k.
Problem 6.5.B.* Ten-feet-high 2 x 4 studs of Douglas fir-larch, No. 1 grade, are used in an
exterior wall. Wind load is 25 psf on the wall surface; studs are 16 in. on center; the gravity
load on the wall is 500 lb/ft of wall length. Investigate the studs for combined action of
compression plus bending using the ASD method. Determine the working compression stress
and bending stress that would be used to investigate the studs for combined stresses. (beam-
column analysis)
Partial answers to check with: fc = 127 psi, fb = 1632 psi (>Fb*CD!)
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