[ Frames ] Determining the resultant forces at pins B and C

In summary, the conversation is about someone seeking help with a problem involving determining support reactions and finding correct answers for Fcd, Fbe, and 1.53 kip. The person is looking for clarification and assistance with their process and equations, as well as advice on determining support reactions first and using the concept of 2 force members.
  • #1
student314
4
0
So I'm a little bummed out about this one, I'd appreciate the help. Apparently the correct answers should be Fcd = 350lb, Fbe = 1531.25lb, or 1.53 kip.

Problem can be viewed here: http://i.imgur.com/pK79lVN.png

Here's my attempt at solution album: http://imgur.com/a/GQsxJ

What can I do? Did I do something wrong? Thanks
 
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  • #2
There's a reason why we have the template here. There's also a reason why we say "Don't post images of your work".

That picture is extremely messy and hard to follow. I'm not even sure what you, re doing on that page.
 
  • #3
I am having trouble seeing what you are doing, I am not following your numbers. It is always a good idea to see if you can determine support reactions first by summing moments about one of the supports before you break apart the individual frame members. You will be able to get the horizontal force reactions. Note that the 1050 pound load acts at the center of its distribution when determining such reactions. Also take advantage of the so called 2 force members where end reactions of these members must be equal and opposite and directed toward each other along the same line of action. You must write down your equations more clearly. Use a sharp pencil!
 

FAQ: [ Frames ] Determining the resultant forces at pins B and C

What is the purpose of determining the resultant forces at pins B and C?

Determining the resultant forces at pins B and C allows us to understand the overall force and direction acting on the frame, which is crucial for analyzing its stability and structural integrity.

How do you calculate the resultant forces at pins B and C?

The resultant force at a pin can be calculated by taking the sum of all the forces acting on that pin, considering both magnitude and direction. This can be done using equations of equilibrium or by drawing a free body diagram.

What factors can affect the resultant forces at pins B and C?

The resultant forces at pins B and C can be affected by various factors such as the weight of the frame, external forces acting on the frame, and the angle and direction of the applied forces.

How do the resultant forces at pins B and C affect the stability of the frame?

The resultant forces at pins B and C play a significant role in determining the stability of the frame. If the resultant force is pointing outside of the frame, it can cause the frame to tip over or collapse. However, if the resultant force is pointing towards the center of the frame, it can help maintain its stability.

What are some real-world applications of determining the resultant forces at pins B and C?

The concept of determining resultant forces at pins B and C is crucial in various fields such as structural engineering, architecture, and physics. It is used to design and analyze the stability of structures like bridges, buildings, and cranes. It is also used in understanding the forces acting on objects in motion, such as vehicles and airplanes.

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