center of gravity of structure

[monchie]

Hello,

In finding the center of gravity of structures,ie, core walls(3 core walls located at various location of the building), it is normally ;1.) establish your reference point 2.) take the individual components(walls) of each core walls(x&y axis on "plan"), and from this you can get its center of gravity.

I've seen some calculations take all the "loadings" of the core walls/structures and from there, they get the center of gravity of the core walls. Any ideas regarding this? Which one is the most reliable method?

 

[KootK]

I don't understand the second method. Can you elaborate?

What is your goal here? Distribution of lateral forces?

I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.

 

[manstrom]

I typically use cad to find the geometric centroid of a polyline that I have drawn around the boundary. If the building has an uneven weight distribution (half wood, half concrete) then method 1 would apply.

Never heard of method 2.

When I am working on a problem, I never think about beauty but when I have finished, if the solution is not beautiful, I know it is wrong.

-R. Buckminster Fuller

 

[BUGGAR]

In "method 2", are you finding the center of resistance? Which may or may not coincide with the center of gravity of the actual forces (resulting in rotation)?

 

[JStephen]

From the description, it sounds like Method 1 is the centroid of an area, and Method 2 is the centroid of the forces applied? Depends on what you're doing with that number. Center of "gravity" implies a centroid of a mass, which would be misleading in either case.