private IShapeCompactness GetCompactness()
{
ISectionI Isec = section as ISectionI;
if (Isec != null)
{
compactness = new ShapeCompactness.IShapeMember(section, IsRolledMember, compressionFiberPosition);
}
else
{
throw new ShapeTypeNotSupportedException(" flexural calculation of I-beam");
}
return(compactness);
}
public double GetCompressionFlangeLocalBucklingCapacity()
{
// compactness criteria is selected by the most slender flange
bool LimitStateApplicable = DetermineIfFLBLimitStateIsApplicable();
double Mn = 0;
CompactnessResult compactnessResult = GetShapeCompactness();
IShapeCompactness thisShapeCompactness = compactnessResult.ShapeCompactness;
CompactnessClassFlexure flangeCompactness = compactnessResult.FlangeCompactness;
double b = compactnessResult.b;
double tf = compactnessResult.tf;
double lambda = compactnessResult.lambda;
double Mp = Z_y * F_y;
double lambdapf = thisShapeCompactness.GetFlangeLambda_p(StressType.Flexure);
double lambdarf = thisShapeCompactness.GetFlangeLambda_r(StressType.Flexure);
switch (flangeCompactness)
{
case CompactnessClassFlexure.Compact:
Mn = double.PositiveInfinity;
break;
case CompactnessClassFlexure.Noncompact:
Mn = Mp - (Mp - 0.7 * F_y * S_y) * ((lambda - lambdapf) / (lambdarf - lambdapf)); //(F6-2)
break;
case CompactnessClassFlexure.Slender:
double Fcr = 0.69 * E / Math.Pow(b / tf, 2.0); //(F6-4)
Mn = Fcr * S_y; //(F6-3)
break;
}
double phiM_n = 0.9 * Mn;
return(phiM_n);
}
private IShapeCompactness GetCompactness()
{
ISectionI Isec = section as ISectionI;
if (Isec != null)
{
compactness = new ShapeCompactness.IShapeMember(section, IsRolledMember, compressionFiberPosition);
}
else
{
throw new ShapeTypeNotSupportedException(" flexural calculation of I-beam");
}
return compactness;
}