| Practice Problem 3-3 (a) |
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Given: Earlier (in Practice Problem 2-4) it was found that member CD of the truss at right was subjected to a force of 520 lb. Truss systems like the one at right are usually built out of Dougles Fir (E = 1.8 Msi). Assume that the truss member is a '2 x 6' (actual dimensions 1.5 in. by 5.5 in.). Req'd: |
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Solution: The axial stress is given by: sCD = F/A sCD = (520 lb)/[(1.5 in)(5.5 in)] = 63.0 psi |
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