public static double TorsionalConstant(this FabricatedISectionProfile profile)
{
if (profile.IsNull())
{
return(0);
}
double b1 = profile.TopFlangeWidth;
double b2 = profile.BotFlangeWidth;
double height = profile.Height;
double tf1 = profile.TopFlangeThickness;
double tf2 = profile.BotFlangeThickness;
double tw = profile.WebThickness;
return((b1 * Math.Pow(tf1, 3) + b2 * Math.Pow(tf2, 3) + (height - (tf1 + tf2) / 2) * Math.Pow(tw, 3)) / 3);
}
public static double WarpingConstant(this FabricatedISectionProfile profile)
{
if (profile.IsNull())
{
return(0);
}
double b1 = profile.TopFlangeWidth;
double b2 = profile.BotFlangeWidth;
double height = profile.Height;
double tf1 = profile.TopFlangeThickness;
double tf2 = profile.BotFlangeThickness;
double tw = profile.WebThickness;
if (tf1 == tf2 && b1 == b2)
{
return(tf1 * Math.Pow(height - tf1, 2) * Math.Pow(b1, 3) / 24);
}
else
{
return(tf1 * Math.Pow(height - (tf1 + tf2) / 2, 2) / 12 * (Math.Pow(b1, 3) * Math.Pow(b2, 3) / (Math.Pow(b1, 3) + Math.Pow(b2, 3))));
}
}