Method of Joints Example Calculation - Truss Analysis - External and Internal Forces on a Truss

The method of joints is a process you can use to determine internal forces in a truss structure. The principle behind method of joints is the equilibrium. In another words all forces acting on a joint must add up to zero. If the forces acting on a joint don’t add up to zero then the joint would not be in equilibrium; meaning the joint would move.
In this example we show you how to calculate external forces on a truss structure and then how to calculate internal force in the members of the truss.

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[nil]

Thank you very much. You just helped me with my studying for my quiz.

[sameersalihy]

Hi dear teacher!
Your videos is very helpful .

[jacobsinger]

You have AC cos(45) = 10. But which 10 kN force are you referring too, the horizontal 10 kN force or the external 10 kN force pointing downward?

[amitdebbarma]

How to calculate having cross truss diagram.. means 3 unknown member having difficulty

[butter]

Should we always assume that joints BC n AD are Zero ? If there are no forces acting on Fx?

[gametricks]

Sir, how to calculate compression load, (Ned)?

[utibeukobo]

The 10 from the AC=cos45....where did it come from