Question

Hello, anyone please help me solve this mechanics problem together? Using 1) method of joints and 2) method of section joint analysis to find out the all forces of each members. If you are able to solve any of the 2 qs above, or even you can't, but u do have some ideas, welcome here to contribute them. :D Thank you very much! ^_^

p/s: There are a few Zero-force members but I can't distinguish them.. :(

Answer 1

I'd start the problem by Finding the Forces components applied on the joint F and G (no horizontal force on G). Then with use of \(F_G\) find stresses on EG and GC. From there find AC and CE. From \(F_F\) find stresses on FB and FD. From FB find stresses on BD and BA. Eventually ED

Answer 2

Oh, thanks! :) I will try that too ..

Answer 3

Is there any zero-force members? Cuz I see too many unkowns.. >.<

Answer 4

If you look at node G, You can find the Force from the slider to the joint should be vertical (take \(F_G\)). Now there are only three forces applied on the joint G. From EC, CG and
\(F_G\). CG and \(F_G\) is in same line. Thus EC should be zero.

Answer 5

so, \[F_{AC} \sin21.80 = F_{G}\] right? But there will be 2 unknowns on joint E, \[F_{EG} and F_{EC}\].. How to calculate Feg then?

Answer 6

sry, i mean Feg and Fed..

Answer 7

Can you tell me how you got \(F_{AC} \sin 21.80 = F_G\)? Below is the forces directions for joint G and C. Also try to choose a node where only 2 unknown forces are present. Therefore you can find those forces by taking components or 'force triangle'