- #1
noboost4you
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I've been having difficulty with this problem for the past 5 hours. I am understanding some part, but I can't get the final answer.
http://img223.imageshack.us/img223/1103/1015zz1.th.jpg
This is what I got so far:
EFx = Ra + Rb - P = 0
Ra + Rb = P
Sab = Sac + Scb = [(-Ra)(a)/AE] + [(Rb)(b)/AE] = 0
-Ra(a) + Rb(b) = 0
-Ra(a) + (P - Ra)b = 0
Ra = (b/a+b)*P
Rb = (a/a+b)*P
Ra = (8in/18in)*100kips = 44.44 kips
Rb = (10in/18in)*100kips = 55.56 kips
I found the reactions but I cannot find the stress of each segment. The fact that the problem isn't giving me the modulus of elasticity is throwing me off.
I know stress = P/A where P = force and A = cross-sectional area
I figured then stress for segment AC = 44.44kips/6in^2 but it doesn't equal the answer in the back of the book. I also figured that would be the same for segment CB but it's not.
Please help because I feel like I've done everything I can to this problem
Thanks
http://img223.imageshack.us/img223/1103/1015zz1.th.jpg
This is what I got so far:
EFx = Ra + Rb - P = 0
Ra + Rb = P
Sab = Sac + Scb = [(-Ra)(a)/AE] + [(Rb)(b)/AE] = 0
-Ra(a) + Rb(b) = 0
-Ra(a) + (P - Ra)b = 0
Ra = (b/a+b)*P
Rb = (a/a+b)*P
Ra = (8in/18in)*100kips = 44.44 kips
Rb = (10in/18in)*100kips = 55.56 kips
I found the reactions but I cannot find the stress of each segment. The fact that the problem isn't giving me the modulus of elasticity is throwing me off.
I know stress = P/A where P = force and A = cross-sectional area
I figured then stress for segment AC = 44.44kips/6in^2 but it doesn't equal the answer in the back of the book. I also figured that would be the same for segment CB but it's not.
Please help because I feel like I've done everything I can to this problem
Thanks
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