//Direct Strength Method F.3-2
public AluminumLimitStateValue GetLocalBucklingStrength(double b, double t, LateralSupportType LateralSupportType,
FlexuralCompressionFiberPosition CompressionLocation, WeldCase WeldCase,
SubElementType SubElementType = SubElementType.Flat)
{
double S_xc = GetSectionModulusCompressionSxc(CompressionLocation);
double M_np = this.GetPlasticMoment();
FlexuralLocalBucklingElement LocalElement = new FlexuralLocalBucklingElement(this.Section.Material, b, t, LateralSupportType,
M_np, S_xc, WeldCase, SubElementType);
double F_b = LocalElement.GetCriticalStress();
double M_n = S_xc * F_b;
AluminumLimitStateValue Y = GetFlexuralYieldingStrength(CompressionLocation);
bool applicable;
double val;
if (M_n > Y.Value)
{
applicable = false;
val = -1.0;
}
else
{
applicable = true;
val = 0.9 * M_n;
}
return(new AluminumLimitStateValue(val, applicable));
}
public AluminumLimitStateValue GetLocalBucklingFlexuralCriticalStress(double b, double t, LateralSupportType LateralSupportType,
FlexuralCompressionFiberPosition CompressionLocation, WeldCase WeldCase,
SubElementType SubElementType = SubElementType.Flat)
{
double S_xc = GetSectionModulusCompressionSxc(CompressionLocation);
double M_np = this.GetPlasticMoment();
FlexuralLocalBucklingElement LocalElement = new FlexuralLocalBucklingElement(this.Section.Material, b, t, LateralSupportType,
M_np, S_xc, WeldCase, SubElementType);
double F_b = LocalElement.GetCriticalStress();
double F_y = 0;
if (WeldCase == Entities.WeldCase.NotAffected)
{
F_y = this.Section.Material.F_ty;
}
else
{
F_y = this.Section.Material.F_tyw;
}
if (F_b > F_y)
{
F_b = F_y;
}
return(new AluminumLimitStateValue(F_b, true));
}
public FlexuralLocalBucklingElement(IAluminumMaterial Material, double b, double t, LateralSupportType LateralSupportType, double M_np, double S_xc,
WeldCase WeldCase, SubElementType SubElementType = SubElementType.Flat)
{
this.Material = Material;
this.b = b;
this.t = t;
this.M_np = M_np;
this.S_xc = S_xc;
this.LateralSupportType = LateralSupportType;
}
