Structural Section Properties

[Anonymous]

Is it possible to calculate I, A, J in Revit?

[catalin_lang]

Just to be sure, what do you mean by I, A, J in Revit?

[A_MAQ · Accepted solution]

I = Moment of inertia

A= area

j= factor related to column slenderness 

Is that right?

[Anonymous]

Yes,

I know that the area is calculated with a filled region but I am wondering if the moment of inertia can be calculated in Revit.  It is done easily in Acad.

[catalin_lang]

For a structural element, I, A, etc. are type parameters and are loaded from a database.

The only calculated parameter, somehow close to what you need, for a structural element, is the Volume.

Do you need to have these parameters already calculated, as for the Volume?

or do you think you need a "tool" that allows you to easily get these values?

[A_MAQ]

you can go to  your family and add a parameter for moment inertia which will be calculated based on the section dimensions, 

[Anonymous]

Easy. Need sross section points

[A_MAQ]

for example

I_x = b h³ / 12 

where b=width of cross section, h = height of cross section

so inside the family you can create a parameter called IX , and the value of this parameter will be a formula equal to I_x = b h³ / 12

[Rafal.Gaweda]

Hi @Anonymous

Or in case the section is complex, you may use Autodesk Robot Section Definition module to calculate properties and then rewrite calculated values to Revit family parameters.

See this.

[Anonymous]

public static double PolygonArea(List<Point> points)
{
var pointsCount = points.Count;
double area = 0;
for (var i = 0; i < pointsCount; i++)
{
area +=
(points[(i + 1) % pointsCount].X - points[i].X) *
(points[(i + 1) % pointsCount].Y + points[i].Y) / 2;
}
return area;
}