Set concrete compression for concrete material

Developers
,
1

Hi All

In the concrete material I created, I can’t set the “concrete compression” property to be equal to (20 MPa); it remains unchanged at (0.1 MPa) as shown in the image below

concrete_compression
concrete_compression790×567 33.3 KB

As far as I know, the internal unit for pressure in Revit is N/ft². I used a formula to convert the unit to MPa, but I don’t know what’s wrong with my code

import clr
import sys
import System
import math

#import Revit API
clr.AddReference('RevitAPI')
import Autodesk
from Autodesk.Revit.DB import *
import Autodesk.Revit.DB as DB
#import specify namespace
from Autodesk.Revit.DB.Structure import *


#import net library
from System import Array
from System.Collections.Generic import List, IList, Dictionary

clr.AddReference('RevitNodes')
import Revit
clr.ImportExtensions(Revit.Elements)
clr.ImportExtensions(Revit.GeometryConversion)
clr.ImportExtensions(Revit.GeometryReferences)

#import transactionManager and DocumentManager (RevitServices is specific to Dynamo)
clr.AddReference('RevitServices')
import RevitServices
from RevitServices.Persistence import DocumentManager
from RevitServices.Transactions import TransactionManager

doc = DocumentManager.Instance.CurrentDBDocument


clr.AddReference("System.Core")
clr.ImportExtensions(System.Linq)


materials = FilteredElementCollector(doc).WherePasses(ElementCategoryFilter(BuiltInCategory.OST_Materials))

material = [i for i in materials if i.Name == "Béton - Coulé sur place - Béton20"]

# converting unit from **`N/ft²`**  to MPA
c = 1/92903.04

if len(material) > 0:
    mat = m
    m_Id = mat.Id
else:
    t = Transaction(doc, 'Get/create concrete material')
    t.Start()
    m_Id = Material.Create(doc, "Béton - Coulé sur place - Béton20")
    mat = doc.GetElement(m_Id)
    mat.MaterialClass = "Concrete"
    asset = StructuralAsset("b", StructuralAssetClass.Concrete)
    asset.ConcreteCompression = 20*c
    struc = PropertySetElement.Create(doc, asset)
    mat.SetMaterialAspectByPropertySet(MaterialAspect.Structural, struc.Id)
    t.Commit()

Any help would be appreciated.

Thanks.

2

Revit internal units for Concrete Compression are N / ft . m - Newton per foot metre which is a totally bizarre unit… anyway
To convert as follows using 1 ft = 0.3048 m:
MPa = 106 N / m2
N / ft . m = MPa * 304800
MPa = N / ft . m / 304800

Edit: Using UnitUtils

UnitUtils.ConvertToInternalUnits(50, UnitTypeId.Megapascals)
# 15240000
UnitUtils.ConvertFromInternalUnits(15240000, UnitTypeId.Megapascals)
# 50