public double GetCb(double Mmax, double MA, double MB, double MC)
{
CbData data = new CbData()
{
M_A = MA, M_B = MB, M_C = MC, Mmax = Mmax
};
return(GetCb(data));
}
internal double GetCb(CbData d)
{
//Cb, the lateral-torsional buckling modification factor for nonuniform moment
//diagrams when both ends of the segment are braced.
// Mmax = absolute value of maximum moment in the unbraced segment, kip-in.(N-mm)
// MA = absolute value of moment at quarter point of the unbraced segment, kip-in. (N-mm)
// MB = absolute value of moment at centerline of the unbraced segment, kipin.(N-mm)
// MC = absolute value of moment at three-quarter point of the unbraced segment kip-in. (N-mm)
// For cantilevers or overhangs where the free end is unbraced, Cb = 1.0.
double Mmax = d.Mmax;
double M_A = d.M_A;
double M_B = d.M_B;
double M_C = d.M_C;
double Cb = 1.0;
Cb = 12.5 * Mmax / (2.5 * Mmax + 3.0 * M_A + 4.0 * M_B + 3.0 * M_C); //(F1-1)
return(Cb);
}
internal double GetCb(CbData d)
{
//Cb, the lateral-torsional buckling modification factor for nonuniform moment
//diagrams when both ends of the segment are braced.
// Mmax = absolute value of maximum moment in the unbraced segment, kip-in.(N-mm)
// MA = absolute value of moment at quarter point of the unbraced segment, kip-in. (N-mm)
// MB = absolute value of moment at centerline of the unbraced segment, kipin.(N-mm)
// MC = absolute value of moment at three-quarter point of the unbraced segment kip-in. (N-mm)
// For cantilevers or overhangs where the free end is unbraced, Cb = 1.0.
double Mmax =d.Mmax;
double M_A=d.M_A;
double M_B=d.M_B;
double M_C = d.M_C;
double Cb = 1.0;
Cb = 12.5 * Mmax / (2.5 * Mmax + 3.0 * M_A + 4.0 * M_B + 3.0 * M_C); //(F1-1)
return Cb;
}
public double GetCb( double Mmax, double MA, double MB, double MC)
{
CbData data = new CbData() { M_A = MA, M_B = MB, M_C = MC, Mmax = Mmax };
return GetCb(data);
}
