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Solve Prob. 1.51, assuming that the structure has been redesigned to use 5/16-in.-diameter pins at A and C as well as at B and that no other changes have been made.
Prob. 1.51
Link AC is made of a steel with a 65-ksi ultimate normal stress and has a 1/4 X 1/2-in. uniform rectangular cross section. It is connected to a support at A and to
member BCD at C by 3/4-in.-diameter pins, while member BCD is connected to its support at B by a 5/16-in.-diameter pin. All of the pins are made of a steel with a 25-
ksi ultimate shearing stress and are in single shear. Knowing that a factor of safety of 3.25 is desired, determine the largest load P that can be applied at D. Note
that link AC is not reinforced around the pin holes.

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