Practice Problem 3-3 (a) Back | Index | Next

Given: In Practice Problem 2-4, it was found that member CD of the truss at right was subjected to a force of 520 lb (tension). Such roof trusses are usually built out of Douglas Fir (E = 1.8 Msi). Assume that the truss member is a "2x6", having actual cross-sectional dimensions 1.5 in. by 5.5 in.

Req'd: Determine the axial (normal) stress in member CD, sCD.

sCD =  psi  (1%)  

roof truss