Is MCB Actually Larger than MBC in Frame Structures?

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Homework Help Overview

The discussion revolves around the comparison of moments MCB and MBC in frame structures, specifically questioning which moment is larger and the implications of a force P's position on the structure's behavior.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants explore the relationship between the moments MCB and MBC, with some suggesting that the original notation may be incorrect. There are attempts to reason based on the position of force P and its effect on the structure's movement.

Discussion Status

There is an ongoing exploration of the relationship between MCB and MBC, with some participants expressing agreement on the notion that MCB may indeed be larger than MBC due to potential typographical errors in the original statement. However, explicit consensus on the conclusion has not been reached.

Contextual Notes

Participants note that the diagram provided may be misleading, and there are concerns about the accuracy of the assumptions regarding the force's position and its effects on the structure.

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Homework Statement


How do we know that the MBC larger than MCB ?

Homework Equations

The Attempt at a Solution


I think MCB is larger than MBC because the moment of P about C is larger ... So to resist moment of P about C , opposite MCB is required... Thus, MCB is larger
 

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fonseh said:

Homework Statement


How do we know that the MBC larger than MCB ?

Homework Equations

The Attempt at a Solution


I think MCB is larger than MBC because the moment of P about C is larger ... So to resist moment of P about C , opposite MCB is required... Thus, MCB is larger
Yes, the diagram is badly drawn. With P near the left, I do not believe the structure would sway to the right like that. It just doesn't feel right. It would all make sense if P were to the right of half way.
 
Ive got a feeling they just got the subscripts wrong and it should say..

MCB is larger than MBC

Eg with p on the left it does move to the right.

I
 
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CWatters said:
Ive got a feeling they just got the subscripts wrong and it should say..

MCB is larger than MBC

Eg with p on the left it does move to the right.

I
Looking through it again, I agree with you. Thanks.
 
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haruspex said:
Looking through it again, I agree with you. Thanks.
So , the concluison now is MCB is larger than MBC ??
 
fonseh said:
So , the concluison now is MCB is larger than MBC ??
Yes, it's just a typo, as CWatters posted.
 
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