topic Re: Structural Section Properties in Revit Structure Forum

Structural Section Properties

Anonymous — Mon, 29 Jan 2018 22:50:54 GMT

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

Re: Structural Section Properties

catalin_lang — Tue, 30 Jan 2018 04:40:33 GMT

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

Re: Structural Section Properties

A_MAQ — Tue, 30 Jan 2018 11:03:33 GMT

I = Moment of inertia

A= area

j= factor related to column slenderness

Is that right?

Re: Structural Section Properties

Anonymous — Tue, 30 Jan 2018 12:04:43 GMT

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.

Re: Structural Section Properties

catalin_lang — Wed, 31 Jan 2018 04:31:14 GMT

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?

Re: Structural Section Properties

A_MAQ — Wed, 31 Jan 2018 08:51:20 GMT

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

Re: Structural Section Properties

Anonymous — Thu, 01 Feb 2018 06:15:56 GMT

Easy. Need sross section points

Re: Structural Section Properties

A_MAQ — Thu, 01 Feb 2018 08:04:03 GMT

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

Re: Structural Section Properties

Rafal.Gaweda — Thu, 01 Feb 2018 12:41:43 GMT

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.

Re: Structural Section Properties

Anonymous — Thu, 01 Feb 2018 13:50:46 GMT

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;
}