I have got a moment about one point, how do I calculate its equivalent moment about another point?

[fran.cesc]

In a beam, one constraint gives a moment as reaction.

I want to write the equation of equilibrium of moments about a point which is different from the point about which my reaction moment is calculated.

How can I calculate the moment about a desired point which is equivalent to the moment about a different point?

Thanks

 

[Stenbrook]

The simplest explanation I can give you is that you must satisfy equilibrium. As in sum of the vertical forces = 0, sum or horizontal forces = 0, and then the sum of the moments = 0 for each direction. If you already have your reactions solved on the beam and want to know what the moment is in the beam at a particular location, than you can "cut the beam" at that location and set up a little free body diagram to solve for what the required internal shear, moment, and axial load in the beam must be to satisfy equilibrium. Without knowing what your beam looks like or what your loading is I don't think there is much more I can say.

 

[rb1957]

if you have a moment at one point in a structure, and no other forces, then you have the same moment at a different point.


another day in paradise, or is paradise one day closer ?

 

[BAretired]

Actually, there are several possibilities. Provide a sketch of your problem.

BA