internal double GetRequiredShearStress()
{
double frv = 0.0;
double F2 = Math.Abs(this.FindMaximumForce(ForceType.F2, true).F2);
double F3 = Math.Abs(this.FindMaximumForce(ForceType.F3, true).F3);
double V = Math.Max(F2, F3);
double A = this.Area;
if (A != 0.0)
{
frv = V / A;
ICalcLogEntry ent = Log.CreateNewEntry();
ent.ValueName = v.frv;
ent.AddDependencyValue(v.Ab, A);
ent.AddDependencyValue(v.Vb, V);
ent.DescriptionReference = d.frv;
ent.FormulaID = f.frv;
ent.VariableValue = frv.ToString();
AddToLog(ent);
}
else
{
throw new Exception("Bolt load information not available");
}
return(frv);
}
internal double CheckMaximumAvailableTensileStrength(double F_pp_nt)
{
double Fnt = NominalTensileStress;
if (F_pp_nt > Fnt)
{
ICalcLogEntry ent = Log.CreateNewEntry();
ent.ValueName = v.F_pp_nt;
ent.AddDependencyValue(v.Fnt, Fnt);
ent.DescriptionReference = d.F_pp_nt;
ent.FormulaID = f.F_pp_ntMax;
ent.VariableValue = F_pp_nt.ToString();
AddToLog(ent);
return(Fnt);
}
return(F_pp_nt);
}
public double GetSlipResistanceReductionFactor(double T_u)
{
double ksc = 0.0;
//Get tension per bolt
double Du = pretensionMultiplier;
double phiR_n = this.GetAvailableTensileStrength();
if (T_u > phiR_n)
{
throw new Exception("Bolt factored force exceeeds capacity. Reduced slip strength cannot be calculated.");
}
ICalcLogEntry ent = Log.CreateNewEntry();
ent.ValueName = v.ksc;
ent.DescriptionReference = d.ksc;
if (T_b == 0.0)
{
throw new Exception("Bolt pretension cannot be zero");
}
if (Du == 0.0)
{
throw new Exception("Multiplier that reflects the ratio of the mean installed bolt pretension to the specified minimum bolt pretension cannot be zero");
}
ksc = 1.0 - T_u / (Du * T_b);
ent.AddDependencyValue(v.Tu, T_u);
ent.Reference = "AISC Formula J3-5a";
ent.FormulaID = f.J3_5.LRFD;
ent.VariableValue = ksc.ToString();
AddToLog(ent);
return(ksc);
}
public double GetAvailableTensileStrength(double V)
{
double F_pp_nt = 0.0;
double Fnt = NominalTensileStress;
double Fnv = NominalShearStress;
//double frv = GetRequiredShearStress();
double Ab = Area;
double frv = V / Ab;
double R = 0.0;
// check if interaction needs to be investigated:
double f_available;
f_available = 0.75 * Fnv;
if (f_available * 0.3 > frv)
{
//interation need not be investigated
return(0.75 * Fnt * Ab);
}
// interaction
ICalcLogEntry ent = Log.CreateNewEntry();
ent.ValueName = v.F_pp_nt;
ent.AddDependencyValue(v.Fnt, Fnt);
ent.DescriptionReference = d.F_pp_nt;
AddToLog(ent);
ent.Reference = "AISC Formula J3-3a";
ent.FormulaID = f.J3_3.a;
F_pp_nt = 1.3 * Fnt - Fnt / (0.75 * Fnv) * frv;
F_pp_nt = CheckMaximumAvailableTensileStrength(F_pp_nt);
ent.VariableValue = F_pp_nt.ToString();
ICalcLogEntry ent2 = Log.CreateNewEntry();
ent2.AddDependencyValue(v.F_pp_nt, F_pp_nt);
ent2.AddDependencyValue(v.Ab, Ab);
ent2.Reference = "AISC Formula J3-2";
ent2.DescriptionReference = d.phiRn.AvailableTensileStrengthForCombinedLoad;
ent2.FormulaID = f.J3_2.LRFD;
R = 0.75 * F_pp_nt * Ab;
ent2.ValueName = v.R;
ent2.VariableValue = R.ToString();
AddToLog(ent2);
return(R);
}