A built-up beam has been constructed by nailing together seven planks as shown. The
Chapter 5, Problem 5.16(choose chapter or problem)
A built-up beam has been constructed by nailing together seven planks as shown. The nails are equally spaced along the beam, and the beam supports a vertical load. As will be shown in Chapter 13, the shearing forces exerted on the nails at A and B are proportional to the first moments with respect to the centroidal x axis of the red-shaded areas shown, respectively, in parts a and b of the figure. Knowing that the force exerted on the nail at A is 120 N, determine the force exerted on the nail at B.
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