Structural Frame Analysis

[Da CnS Engr]

Hi everyone,

Attached is photo of a structural frame. Can anyone help to resolve R1, R2, R3 and R4 in terms of "P" and "L"?

From my own understanding:

1. P = R3 + R4
2. Since the frame should stay static, the tilting force from P would result in R1 to be a downward force.

I did my own calculations but got confused, still had some doubts. Hope someone can help on this, thanks!

 

[dik]

In the absense of DL and LL forces, R1 should be downward, or have a magnitude of P x L2 / L1 with a minus sign. You can use a +ve or -ve sign to change the direction, too...

So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates

-Dik

 

[BAretired]

P*L2 = R2*L1; R1=-R2; R3=R4 = P/2.

BA

 

[271828]

What BAretired said, assuming the columns are equal size.