public List <IMoveableSection> GetTransformedRebarShapes(double YMax, double YMin)
{
List <IMoveableSection> barSections = new List <IMoveableSection>();
double E_c = this.Section.Material.ModulusOfElasticity;
double E_s = 29000000.0; //Steel modulus of elasticity
double n = E_s / E_c;
List <RebarPoint> filteredBars = LongitudinalBars.Where
(
b =>
b.Coordinate.Y >= YMin && b.Coordinate.Y <= YMax
).ToList();
foreach (RebarPoint rbrPnt in filteredBars)
{
double A_bar = rbrPnt.Rebar.Area * n;
double d_bar = rbrPnt.Rebar.Diameter;
if (d_bar == 0)
{
d_bar = (YMax - YMin) / 100.0;
}
Point2D thisCentroid = new Point2D(rbrPnt.Coordinate.X, rbrPnt.Coordinate.Y);
SectionRectangular rect = new SectionRectangular(null, A_bar / d_bar, d_bar, thisCentroid);
//rect.Centroid = new Point2D(rbrPnt.Coordinate.X, rbrPnt.Coordinate.Y);
barSections.Add(rect);
}
return(barSections);
}
private LinearStrainDistribution GetStrainMaxTensionMaxCompression(FlexuralCompressionFiberPosition CompressionFiberPosition)
{
//Calulate limit strain for the lowest rebar point
//Distinguish between top and bottom tension cases
double StrainDistributionHeight = 0.0;
//double MaxStrain = CalculateMaximumSteelStrain(CompressionFiberPosition);
double MaxStrain = this.MaxSteelStrain;
LinearStrainDistribution MaxMaxDistribution;
StrainDistributionHeight = GetStrainDistributionHeight(CompressionFiberPosition);
if (CompressionFiberPosition == FlexuralCompressionFiberPosition.Top)
{
var LowestPointY = LongitudinalBars.Min(yVal => yVal.Coordinate.Y);
var PointsAtLowestY = LongitudinalBars.Where(point => point.Coordinate.Y == LowestPointY).Select(point => point);
var LimitStrain = PointsAtLowestY.Min(point => point.Rebar.Material.GetUltimateStrain(point.Rebar.Diameter));
MaxStrain = LimitStrain;
MaxMaxDistribution = new LinearStrainDistribution
(StrainDistributionHeight, this.MaxConcreteStrain, -MaxStrain);
}
else
{
var HighestPointY = LongitudinalBars.Max(yVal => yVal.Coordinate.Y);
var PointsAtHighestY = LongitudinalBars.Where(point => point.Coordinate.Y == HighestPointY).Select(point => point);
var LimitStrain = PointsAtHighestY.Min(point => point.Rebar.Material.GetUltimateStrain(point.Rebar.Diameter));
MaxStrain = LimitStrain;
MaxMaxDistribution = new LinearStrainDistribution
(StrainDistributionHeight, -MaxStrain, this.MaxConcreteStrain);
}
return(MaxMaxDistribution);
}
/// <summary>
/// Pure axial strength. Implementation here is for Non prestressed section
/// </summary>
/// <returns></returns>
protected virtual double GetP_o()
{
//22.4.2.2
double A_g = Section.SliceableShape.A;
var compressionLongitudinalBars = LongitudinalBars.Where(r => r.Rebar.IsTensionOnly == false);
double A_s = compressionLongitudinalBars.Sum(b =>
{
if (b.Rebar.IsTensionOnly == false)
{
return(b.Rebar.Area);
}
else
{
return(0);
}
}
);
double f_c = Section.Material.SpecifiedCompressiveStrength;
double f_yA_s = LongitudinalBars.Sum(b => b.Rebar.Area * b.Rebar.Material.YieldStress);
//(22.4.2.2)
double P_o = 0.85 * f_c * (A_g - A_s) + f_yA_s;
return(P_o);
}
protected virtual double CalculateMaximumSteelStrain(FlexuralCompressionFiberPosition CompressionFiberPosition)
{
double MaxStrain = 0.0;
if (CompressionFiberPosition == FlexuralCompressionFiberPosition.Top)
{
var LowestPointY = LongitudinalBars.Min(yVal => yVal.Coordinate.Y);
var PointsAtLowestY = LongitudinalBars.Where(point => point.Coordinate.Y == LowestPointY).Select(point => point);
var LimitStrain = PointsAtLowestY.Min(point => point.Rebar.Material.GetUltimateStrain(point.Rebar.Diameter));
MaxStrain = -LimitStrain;
}
else
{
var HighestPointY = LongitudinalBars.Max(yVal => yVal.Coordinate.Y);
var PointsAtHighestY = LongitudinalBars.Where(point => point.Coordinate.Y == HighestPointY).Select(point => point);
var LimitStrain = PointsAtHighestY.Min(point => point.Rebar.Material.GetUltimateStrain(point.Rebar.Diameter));
MaxStrain = -LimitStrain;
}
return(MaxStrain);
}
protected double GetStrainDistributionHeight(FlexuralCompressionFiberPosition CompressionFiberPosition)
{
double StrainDistributionHeight = 0.0;
double YMax = Section.SliceableShape.YMax;
double YMin = Section.SliceableShape.YMin;
double XMax = Section.SliceableShape.XMax;
double XMin = Section.SliceableShape.XMin;
if (CompressionFiberPosition == FlexuralCompressionFiberPosition.Top)
{
var LowestPointY = LongitudinalBars.Min(yVal => yVal.Coordinate.Y);
var PointsAtLowestY = LongitudinalBars.Where(point => point.Coordinate.Y == LowestPointY).Select(point => point);
StrainDistributionHeight = Math.Abs(YMax - LowestPointY);
}
else
{
var HighestPointY = LongitudinalBars.Max(yVal => yVal.Coordinate.Y);
var PointsAtHighestY = LongitudinalBars.Where(point => point.Coordinate.Y == HighestPointY).Select(point => point);
StrainDistributionHeight = Math.Abs(YMin - HighestPointY);
}
return(StrainDistributionHeight);
}