Homework #8 60 #/' 12' fb = My/l = M/S fv=VQ/lb (general formula) A 2x8 joist (b=1.5"; h=7.25") is loaded with a ur span. Determine the maximum bending stress developed in the joist.

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Q: the maximum shear stress in the wood.  Vmax=3530.8 N, Iz=287239583.3 mm4 Answer: 0.2017MPa

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Sizing Joists and Rafters

In civil engineering and building construction, joists and rafters are the major components including beams and columns. Almost every structural construction including buildings, skyscrapers, bridges, commercial complexes, and so on makes use of joists and rafters to provide structural integrity to the building. Joists are primarily thick long pieces of metals, concrete, or wood that are used to support the floor and ceiling. On the other hand, rafters form the major component of pitched roofs, which are a series of sloped long pieces extending from a ridged area that makes contact with the plane area of the wall. They account for the load-bearing of the building along with the beams.