jpchaney 10 Posted September 12, 2012 A structural engineer asked me to find the center of gravity of a steel truss. But not the center of a mass - I mean the actual center of gravty - taking into account the weight per linear foot of steel of all members involved. Is there a way to do this using Revit Structural or even regular Autocad? Quote Share this post Link to post Share on other sites
Dadgad 11 Posted September 13, 2012 Welcome to the forum. MASSPROP is an awesome command, it will only work on solids or regions. I exploded the xrefed image here, then used union so that MASSPROP would treat it as an assembly. This was done in Autocad Vanilla, I am not sure, but would think that REVIT must have it, or something like it. As you see at the bottom of the window, there is an option to write the information to a file too. Quote Share this post Link to post Share on other sites
SLW210 74 Posted September 13, 2012 A structural engineer asked me to find the center of gravity of a steel truss. But not the center of a mass - I mean the actual center of gravty - taking into account the weight per linear foot of steel of all members involved. Is there a way to do this using Revit Structural or even regular Autocad? What is the difference between center of mass and center of gravity? Quote Share this post Link to post Share on other sites
Lee Roy 10 Posted September 13, 2012 What is the difference between center of mass and center of gravity? There isn't a difference, unless he's a theoretical physicist working with non-uniform gravitational fields, in which case I don't think he'd be here asking questions. *Penny, Penny, Penny* http://en.wikipedia.org/wiki/Center_of_mass The term "center of mass" is often used interchangeably with the term center of gravity because any uniform gravitational field g acts on a system as if the mass M of the system were concentrated at the center of mass R. The center of gravity is defined as the average position of weight distribution, and mass and weight are technically different properties. However, because weight and mass are proportional, the center of gravity and center of mass refer to the same point of an object for almost all objects on and near Earth's surface. Generally, physicists prefer to use the term center of mass, as an object has a center of mass whether or not it is under the influence of gravity. In addition, the term "center of gravity" refers to the single point associated with an object where the force of gravity can be considered to act, Quote Share this post Link to post Share on other sites
SLW210 74 Posted September 13, 2012 That was my point. It was a trick question or the "engineer" needs to go back to school. Quote Share this post Link to post Share on other sites