7-40. The simply-supported beam is built-up from three boards by nailing them together as shown. The wood has an allowable shear stress of t allow = 1.5 MPa, and an allowable bending stress of s allow = 9 MPa. The nails are spaced at s = 75 mm, and each has a shear strength of 1.5 kN. Determine the maximum allowable force P that can be applied to the beam. | |
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