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## Main Question or Discussion Point

Hi people,

I'm a bit confused as to when we can and cannot add 2 moments together. From what I understand, we CAN add them together if they are both about the same origin but CANNOT if they are about different origins.

But when drawing and calculating bending moment diagrams, you have to find the bending moment at each point/section of the structure but doing so seems to require you to add external moments and internal moments together even though they do not rotate about the same point.

Could someone please clarify this for me?

Thanks

I'm a bit confused as to when we can and cannot add 2 moments together. From what I understand, we CAN add them together if they are both about the same origin but CANNOT if they are about different origins.

But when drawing and calculating bending moment diagrams, you have to find the bending moment at each point/section of the structure but doing so seems to require you to add external moments and internal moments together even though they do not rotate about the same point.

Could someone please clarify this for me?

Thanks