Problem 1-75/1-76/1-77/ Engineering Mechanics Materials

Engineering mechanics problem with solution.
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1–75. The hangers support the joist uniformly, so that it is assumed the four nails on each hanger carry an equal portion of the load. If the joist is subjected to the loading shown, determine the average shear stress in each nail of the hanger at ends A and B . Each nail has a diameter of 0.25 in. The hangers only support vertical loads.

1–76. The hangers support the joists uniformly, so that it is assumed the four nails on each hanger carry an equal portion of the load. Determine the smallest
diameter of the nails at A and at B i f the allowable stress
for the nails is tallow = 4 ksi. The hangers only support
vertical loads.

1–77. The tension member is fastened together using two bolts, one on each side of the member as shown. Each bolt has a diameter of 0.3 in. Determine the maximum load Pthat can be applied to the member if the allowable shear stress for the bolts is tallow = 12 ksi and the allowable average normal stress is sallow = 20 ksi .