Is MCB Actually Larger than MBC in Frame Structures?

[fonseh]

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

 

[haruspex]

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.

 

[CWatters]

Ive got a feeling they just got the subscripts wrong and it should say..

M_CB is larger than M_BC

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

I

 

[CWatters]

The only other source/reference I could google up was this one and it's just a diagram with no explanation..

http://www.arch.ttu.edu/courses/2008/fall/3501perl/SanMartin/Project1/MultipleFrames.htm

 

[haruspex]

Ive got a feeling they just got the subscripts wrong and it should say..

M_CB is larger than M_BC

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

I

Looking through it again, I agree with you. Thanks.

 

[fonseh]

Looking through it again, I agree with you. Thanks.

So , the concluison now is MCB is larger than MBC ??

 

[haruspex]

So , the concluison now is MCB is larger than MBC ??

Yes, it's just a typo, as CWatters posted.