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Spring 2007
e Lab # 3 — Beam design
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Show ail calculations
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1 For the beam shown above, find the largest load w, the beam can support if bending controls. The bending stress
allowable is 1750 psi and the beam is a two-ply 2x6 stringer. L is equal to 4’- 4.”
2. Find the largest load for the beam if shear controls and everything else remains the same as in problem #1. The
@ allowable shear stress is 180 psi.
3. What is the allowable load for the beam if the deflection must be limited to 1/360? The modulus of elasticity is
1.5E6 psi and everything else is the same as in problems | and 2.
4. Is the capacity of the beam above controlled by bending, shear, or deflection? Explain.
5. What is the largest span for the beam if it is a single 2x8 and has a load w equal to 248 pif? Assume the wood
properties remain the same and the deflection must be less than L/270,
6. Whar is the smallest standard size lumber beam that will carry a load of 375 pif when supported as above with a
span of 3’- 6” and an allowable bending stress of 1400 psi, shear stress allowable of 140 psi, and an E = 1. 4E6
psi. Deflection must be limited to 1/240.
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