public virtual SectionAnalysisResult GetSectionResult(LinearStrainDistribution StrainDistribution, FlexuralCompressionFiberPosition compFiberPosition)
{
double CompressedBarCentroidCoordinate = 0; //Calculate the Coordinate of rebar resultant
ForceMomentContribution CForceRebarResultant = GetCompressionForceRebarResultant(StrainDistribution, compFiberPosition);
double CompressedRebarArea = GetCompressedRebarArea(CForceRebarResultant);
ForceMomentContribution CForceConcreteResultant = GetCompressionForceConcreteResultant(StrainDistribution, compFiberPosition,
CompressedRebarArea, CompressedBarCentroidCoordinate);
ForceMomentContribution CForceResultant = CForceRebarResultant + CForceConcreteResultant;
ForceMomentContribution TForceResultant = GetTensionForceResultant(StrainDistribution, compFiberPosition);
SectionAnalysisResult result = new SectionAnalysisResult()
{
AxialForce = CForceResultant.Force + TForceResultant.Force,
CForce = CForceResultant.Force,
TForce = TForceResultant.Force,
Moment = CForceResultant.Moment + TForceResultant.Moment,
Rotation = 0,
StrainDistribution = StrainDistribution,
CompressionRebarResults = CForceRebarResultant.RebarResults,
TensionRebarResults = TForceResultant.RebarResults
};
return(result);
}
protected virtual ForceMomentContribution GetCompressionForceConcreteResultant(LinearStrainDistribution StrainDistribution, FlexuralCompressionFiberPosition compFiberPosition,
double CompressedRebarArea, double CompressedBarCentroidCoordinate)
{
ForceMomentContribution concreteContrib = GetConcreteForceResultant(StrainDistribution, compFiberPosition, CompressedRebarArea, CompressedBarCentroidCoordinate);
return(concreteContrib);
}
protected ForceMomentContribution GetApproximateRebarResultant(BarCoordinateFilter CoordinateFilter, BarCoordinateLimitFilterType LimitFilterType,
double CutoffCoordinate)
{
ForceMomentContribution resultant = new ForceMomentContribution();
double barLimitForce = 0;
double barLimitForceMoment = 0;
List <RebarPoint> filteredBars = GetFilteredBars(CutoffCoordinate, CoordinateFilter, LimitFilterType);
foreach (var bar in filteredBars)
{
if (CoordinateFilter == BarCoordinateFilter.X) // && LimitFilterType == BarCoordinateLimitFilterType.Maximum)
{
barLimitForce = bar.Rebar.GetDesignForce();
barLimitForceMoment = barLimitForce * bar.Coordinate.X;
}
else
{
barLimitForce = bar.Rebar.GetDesignForce();
barLimitForceMoment = barLimitForce * bar.Coordinate.Y;
}
ForceMomentContribution barResultant = new ForceMomentContribution()
{
Force = barLimitForce, Moment = barLimitForceMoment
};
resultant += barResultant;
}
return(resultant);
}
protected ForceMomentContribution GetRebarResultant(LinearStrainDistribution StrainDistribution, ResultantType resType
, FlexuralCompressionFiberPosition p)
{
ForceMomentContribution resultant = new ForceMomentContribution();
//tension is negative
List <RebarPointResult> RebarResults = CalculateRebarResults(StrainDistribution, p);
foreach (var barResult in RebarResults)
{
if (resType == ResultantType.Tension)
{
if (barResult.Strain < 0)
{
resultant.Force += barResult.Force;
resultant.Moment += barResult.Force * barResult.DistanceToNeutralAxis;
}
}
else
{
if (barResult.Strain > 0)
{
resultant.Force += barResult.Force;
resultant.Moment += barResult.Force * barResult.DistanceToNeutralAxis;
}
}
}
resultant.RebarResults = RebarResults;
return(resultant);
}
protected virtual LinearStrainDistribution GetInitialStrainEstimate(FlexuralCompressionFiberPosition CompressionFiberPosition)
{
//Find rebar resultant force
// for initial estimate include only rebar below the centroid line
// as a reasonable estimate for most regular beams
double centroidY = Section.SliceableShape.YMin + Section.SliceableShape.y_Bar;
ForceMomentContribution rebarResultant = null;
switch (CompressionFiberPosition)
{
case FlexuralCompressionFiberPosition.Top:
rebarResultant = GetApproximateRebarResultant(BarCoordinateFilter.Y, BarCoordinateLimitFilterType.Maximum, centroidY);
break;
case FlexuralCompressionFiberPosition.Bottom:
rebarResultant = GetApproximateRebarResultant(BarCoordinateFilter.Y, BarCoordinateLimitFilterType.Minimum, centroidY);
break;
default:
throw new CompressionFiberPositionException();
}
//Get corresponding strain
double a = GetCompressionBlockDepth(rebarResultant.Force, CompressionFiberPosition);
LinearStrainDistribution strainDistribution = GetStrainDistributionBasedOn_a(a, CompressionFiberPosition);
return(strainDistribution);
}
public static ForceMomentContribution operator +(ForceMomentContribution a, ForceMomentContribution b)
{
ForceMomentContribution forceContrib = new ForceMomentContribution();
forceContrib.Force = a.Force + b.Force;
//forceContrib.Moment = Math.Abs(a.Moment) + Math.Abs(b.Moment);
forceContrib.Moment = a.Moment + b.Moment;
return(forceContrib);
}
protected ForceMomentContribution GetRebarResultant(BarCoordinateFilter CoordinateFilter, BarCoordinateLimitFilterType LimitFilter, double CutoffCoordinate)
{
ForceMomentContribution resultant = new ForceMomentContribution();
foreach (var bar in longitBars)
{
double barLimitForce = 0;
double barLimitForceMoment = 0;
if (CoordinateFilter == BarCoordinateFilter.X && LimitFilter == BarCoordinateLimitFilterType.Maximum)
{
if (bar.Coordinate.X <= CutoffCoordinate)
{
barLimitForce = bar.Rebar.GetDesignForce();
barLimitForceMoment = barLimitForce * bar.Coordinate.X;
}
}
if (CoordinateFilter == BarCoordinateFilter.Y && LimitFilter == BarCoordinateLimitFilterType.Maximum)
{
if (bar.Coordinate.Y <= CutoffCoordinate)
{
barLimitForce = bar.Rebar.GetDesignForce();
barLimitForceMoment = barLimitForce * bar.Coordinate.Y;
}
}
if (CoordinateFilter == BarCoordinateFilter.X && LimitFilter == BarCoordinateLimitFilterType.Minimum)
{
if (bar.Coordinate.X >= CutoffCoordinate)
{
barLimitForce = bar.Rebar.GetDesignForce();
barLimitForceMoment = barLimitForce * bar.Coordinate.X;
}
}
if (CoordinateFilter == BarCoordinateFilter.Y && LimitFilter == BarCoordinateLimitFilterType.Minimum)
{
if (bar.Coordinate.Y >= CutoffCoordinate)
{
barLimitForce = bar.Rebar.GetDesignForce();
barLimitForceMoment = barLimitForce * bar.Coordinate.Y;
}
}
ForceMomentContribution barResultant = new ForceMomentContribution()
{
Force = barLimitForce, Moment = barLimitForceMoment
};
resultant += barResultant;
}
return(resultant);
}
private double GetCompressedRebarArea(ForceMomentContribution CForceRebarResultant)
{
double A = 0;
foreach (var bar in CForceRebarResultant.RebarResults)
{
if (bar.Stress > 0)
{
A = A + bar.Point.Rebar.Area;
}
}
return(A);
}
protected ForceMomentContribution GetConcreteWhitneyForceResultant(LinearStrainDistribution StrainDistribution, FlexuralCompressionFiberPosition compFiberPosition,
double CompressedRebarArea, double CompressedRebarCentroidCoordinate)
{
ForceMomentContribution ConcreteCompressionContribution = new ForceMomentContribution();
// CalculateBeta and compression block height
double c = GetDistanceToNeutralAxis(StrainDistribution, compFiberPosition);
double h = Section.SliceableShape.YMax - Section.SliceableShape.YMin;
double a;
if (c == double.PositiveInfinity || c == double.NegativeInfinity)
{
a = h;
}
else
{
a = GetCompressionBlockDepth(c);
if (a > h)
{
a = h;
}
}
//double CentroidYToTopEdge = (Section.SliceableShape.YMax-Section.SliceableShape.YMin)-Section.SliceableShape.y_Bar;
//double neutralAxisToBottomOfCompressedShapeOffset = CentroidYToTopEdge - a;
IMoveableSection compressedPortion = null;
ISliceableSection sec = this.Section.SliceableShape as ISliceableSection;
if (sec != null)
{
compressedPortion = GetCompressedConcreteSection(StrainDistribution, compFiberPosition, a);
}
//this analysis subtracts the area of bars from the section but the location of the centroid of the
//compressed section is not modified
double A = compressedPortion.A - CompressedRebarArea;
double fc = Section.Material.SpecifiedCompressiveStrength;
double WhitneyBlockStress = GetWhitneyBlockStress();
double ConcreteResultantForce = A * WhitneyBlockStress;
ConcreteCompressionContribution.Force = ConcreteResultantForce;
double concreteForceCentroidDistance = compressedPortion.GetElasticCentroidCoordinate().Y - Section.SliceableShape.GetElasticCentroidCoordinate().Y;
ConcreteCompressionContribution.Moment = concreteForceCentroidDistance * ConcreteResultantForce;
return(ConcreteCompressionContribution);
}
ForceMomentContribution GetConcreteForceResultant(LinearStrainDistribution StrainDistribution, FlexuralCompressionFiberPosition compFiberPosition,
double CompressedRebarArea, double CompressedBarCentroidCoordinate)
{
ForceMomentContribution concreteForceResultant = null;
if (compFiberPosition == FlexuralCompressionFiberPosition.Top)
{
if (StrainDistribution.TopFiberStrain < this.MaxConcreteStrain && StrainDistribution.TopFiberStrain >= 0)
{
concreteForceResultant = GetConcreteParabolicStressForceResultant(StrainDistribution);
}
else
{
if (StrainDistribution.TopFiberStrain == this.MaxConcreteStrain)
{
concreteForceResultant = GetConcreteWhitneyForceResultant(StrainDistribution, compFiberPosition, CompressedRebarArea, CompressedBarCentroidCoordinate);
}
else if (StrainDistribution.TopFiberStrain < 0)
{
concreteForceResultant = new ForceMomentContribution()
{
Force = 0,
Moment = 0,
RebarResults = new List <RebarPointResult>()
};
}
else
{
throw new UltimateConcreteStrainExceededException();
}
}
}
else
{
if (StrainDistribution.BottomFiberStrain < this.MaxConcreteStrain && StrainDistribution.TopFiberStrain >= 0)
{
concreteForceResultant = GetConcreteParabolicStressForceResultant(StrainDistribution);
}
else
{
if (StrainDistribution.BottomFiberStrain == this.MaxConcreteStrain)
{
concreteForceResultant = GetConcreteWhitneyForceResultant(StrainDistribution, compFiberPosition, CompressedRebarArea, CompressedBarCentroidCoordinate);
}
else if (StrainDistribution.TopFiberStrain < 0)
{
concreteForceResultant = new ForceMomentContribution()
{
Force = 0,
Moment = 0,
RebarResults = new List <RebarPointResult>()
};
}
else
{
throw new UltimateConcreteStrainExceededException();
}
}
}
return(concreteForceResultant);
}
protected virtual ForceMomentContribution GetTensionForceResultant(LinearStrainDistribution StrainDistribution, FlexuralCompressionFiberPosition compFiberPosition)
{
ForceMomentContribution rebarContribution = GetRebarResultant(StrainDistribution, ResultantType.Tension, compFiberPosition);
return(rebarContribution);
}
