Homework Answers
Lemgth of AB=12"
Area of AB=2 in²
E of AB=29000 ksi
Max stress in AB=20 Ksi
Max load allowable in AB=20*2=40 kips
Verticak displacemet of B=(20/29000)*12=0.00827 in
Vertical displacement at D=0.00827*(6+4)/6=0.0137 in<0.05 in
Therefore, F should be such that force in AB is 40 kips
From moment equilibrium about C,
F*4=40*6
F=60 kips
This is the required answer
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