public static Dictionary <string, object> ThresholdTorsion(ConcreteFlexureAndAxiaSection ConcreteSection, double N_u, double c_transv_ctr,
bool IsPrestressed = false, string Code = "ACI318-14")
{
//Default values
double phiT_th = 0;
//Calculation logic:
TorsionShapeFactory tss = new TorsionShapeFactory();
ConcreteSectionFlexure cross_Section = ConcreteSection.FlexuralSection as ConcreteSectionFlexure;
if (cross_Section != null)
{
if (cross_Section.Section.SliceableShape is ISectionRectangular)
{
IConcreteTorsionalShape shape = tss.GetShape(cross_Section.Section.SliceableShape, ConcreteSection.ConcreteMaterial.Concrete, c_transv_ctr);
ConcreteSectionTorsion s = new ConcreteSectionTorsion(shape);
phiT_th = s.GetThreshholdTorsion(N_u) / 1000.0; //Conversion from ACI psi units to ksi units
}
else
{
throw new Exception("Only rectangular cross-sections are currently supported for torsional calculations");
}
}
else
{
throw new Exception("Unrecognized shape type");
}
return(new Dictionary <string, object>
{
{ "T_th", phiT_th }
});
}
public void RectangularBeamReturnsThresholdTorsionValue()
{
double h = 24.0;
double d = 21.5;
double b = 14.0;
double N_u = 0.0;
double fc = 3000.0;
double c_center = 0.0;
ConcreteSectionTorsion tb = GetConcreteTorsionBeam(b, h, fc, d, false, c_center);
double T_th = tb.GetThreshholdTorsion(N_u) / 1000.0; //Conversion from ACI psi units to ksi units
double refValue = 61; //Example 7-2
double actualTolerance = EvaluateActualTolerance(T_th, refValue);
Assert.LessOrEqual(actualTolerance, tolerance);
}
