What is the key to solving this two and three force members problem?

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The discussion focuses on solving a structural mechanics problem involving a load applied to a structure with two and three force members. Key points include the identification of two-force members, which are crucial for determining the equilibrium conditions, and the distinction between the hinges at points E and F, which affects the bending moments and reaction forces. Participants emphasize the importance of understanding these concepts to find the reaction forces at points D and G. The conversation highlights the need for a solid grasp of equilibrium equations and moments to solve the problem effectively. Ultimately, mastering these principles is essential for successfully determining the required reactions in the structure.
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Homework Statement



Hi, I've been looking over this problem and I can't manage to find a suitable approach to such a question :S maybe you could help me out. The structure can be seen in the given image.

As shown, a load of magnitude is applied to a structure. Assuming that all members are weightless and that ABEF and BCD are rigid bodies, find the magnitudes of the reactions at D and G needed to maintain the structure in equilibrium.

Assume the following values: a = 4.50m , b = 3.00m , and P = 110N .

Homework Equations



Equilibrium equations..

The Attempt at a Solution



No attemps..
 

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thanks for the overwhelming help :D i managed to work it out by myself.
 
I know you did this problem long ago, but if you still understand how to do it, could you please explain? I am very lost
 
where could i find how to this problem?!
 
:smile:
Ady1219 said:
where could i find how to this problem?!

Hi, Ady1219, welcome to Physics Forums! :smile:
Looks like lmck33 couldn't wait a day for the help, so he may still be a bit heated. Hint: Can you identify a 2 force member in this problem? There are two of them. A 2-force member is one in which forces are applied at the ends of the member only, with no forces in between, and as a result, the 2 forces on these members must be equal and opposite and point toward each other from one end to the other, from equilibrium considerations.
 
Hi guys

I really need help with that Question, I really don't how to find the reaction force acting D and G. I have Identified all the 2 and 3 force members so far but still haven't got enought skill to find the solution.

anyone keen to explain to me will be great !.
 
The key to this problem is to understand the difference between the hinge at E and the hinge at F. Whereas ABEF is a bar with various moments in it, especially at E because it is continuous there, F is different. What do you know about the bending moment at F? How does that help you find the reaction at G?
 

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