Question about beam and moment in mechanic engineering

AI Thread Summary
The discussion focuses on determining the reactions and moments for a connected beam system in mechanical engineering. The initial calculations provided by the user include various vertical and horizontal reactions, but there is uncertainty about their correctness. Key points raised include the need for vertical reactions at points A and C to sum to the total downward load and the importance of including the reactive moment at A in the free body diagram. The problem is identified as statically indeterminate, requiring the use of axial deflection compatibility equations to solve for horizontal reactions. Overall, the accuracy of the user's answers is questioned, and further clarification on the problem's setup is suggested.
kai92
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Homework Statement



The beam AB shown is connected to beam BC.Find the reaction at each supporting point and moment at A.
Question.PNG


Homework Equations


This is the FBD given by the lecturer:
FBD.PNG


The Attempt at a Solution


Actually,I get the answer but not sure correct or not.These are my answer:
y=0.14kN
Ax=0N
Ay=0.07kN
Bx=0.105kN
By=0.07kN
Cx=-0.105kN
Cy=7.93kN

Someone please tell me whether my answer are correct or not.If not,please give me suggestion.Thanks
 
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I am not sure why you are getting decimal numbers..the vertical load for examople is 16 kN down, so the vert reactions at A and C must add to 16 kN up. And the horiz reactions must add up to 6 kN. The reactive moment at A is missing from the free body diagram. The problem is statically indeterminate..to get the horiz reactions, you have to use axial deflection compatability equations (A will 'hog' most of the horizonatl load.)
 
This is statically determinate, the extra equation coming from the zero bending moment at B. What is the bending moment at B, taking moments to the right of B?
 
pongo38 said:
This is statically determinate, the extra equation coming from the zero bending moment at B. What is the bending moment at B, taking moments to the right of B?
Both ends are restrained from lateral movement, thus, the problem is statically indeterminate in the x direction.
 
Apologies. Jay is right. But I wonder if the question is correctly illustrating what was intended?
 
Yes, I have my doubts also.
 
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