//Compression Flange Local Buckling F4.3
public double GetCompressionFlangeLocalBucklingCapacity(FlexuralCompressionFiberPosition compressionFiberPosition)
{
double Mn = 0.0;
double bf = GetCompressionFlangeWidthbfc(compressionFiberPosition);
double tf = GetCompressionFlangeThicknesstfc(compressionFiberPosition);
ShapeCompactness.IShapeMember compactness = new ShapeCompactness.IShapeMember(Section, IsRolledMember, compressionFiberPosition);
CompactnessClassFlexure flangeCompactness = compactness.GetFlangeCompactnessFlexure();
double lambda = compactness.GetCompressionFlangeLambda();
double Sxc = GetSectionModulusCompressionSxc(compressionFiberPosition);
switch (flangeCompactness)
{
case CompactnessClassFlexure.Compact:
throw new LimitStateNotApplicableException("Compression Flange Local buckling");
case CompactnessClassFlexure.Noncompact:
double Rpc = GetRpc(compressionFiberPosition);
double Myc = GetCompressionFiberYieldMomentMyc(compressionFiberPosition);
double lambdapf = compactness.GetFlangeLambda_p(StressType.Flexure);
double lambdarf = compactness.GetFlangeLambda_r(StressType.Flexure);
double FL = GetStressFL(compressionFiberPosition);
Mn = Rpc * Myc - (Rpc * Myc - FL * Sxc) * ((lambda - lambdapf) / (lambdarf - lambdapf)); //(F4-13)
break;
case CompactnessClassFlexure.Slender:
double kc = Getkc();
double E = this.Section.Material.ModulusOfElasticity;
Mn = 0.9 * E * kc * Sxc / Math.Pow(lambda, 2);
break;
}
double phiM_n = 0.9 * Mn;
return(phiM_n);
}
protected virtual double GetLambdarf(FlexuralCompressionFiberPosition compressionFiberPosition)
{
compactness = new ShapeCompactness.IShapeMember
(this.Section, this.isRolledMember, compressionFiberPosition);
return(compactness.GetFlangeLambda_r(StressType.Flexure));
}