/// <summary>
/// Calculates shear lag factor per AISC Table D3.1 "Shear Lag Factors for Connections to Tension Members".
/// </summary>
public override double GetShearLagFactor()
{
double U;
if (N < 3)
{
ShearLagCase2 Case2 = new ShearLagCase2(x_ob, l);
U = Case2.GetShearLagFactor();
}
else if (N == 3)
{
U = 0.6;
}
else
{
U = 0.8;
}
// If Case 2 information is applicable
if (x_ob > 0 && l > 0)
{
ShearLagCase2 Case2 = new ShearLagCase2(x_ob, l);
double U_case2 = Case2.GetShearLagFactor();
U = Math.Min(U, U_case2);
}
return(U);
}
/// <summary>
/// Calculates shear lag factor per AISC Table D3.1 "Shear Lag Factors for Connections to Tension Members".
/// </summary>
public override double GetShearLagFactor()
{
double U, U1, U2;
if (N < 3)
{
ShearLagCase2 Case2 = new ShearLagCase2(x_ob, l);
U1 = Case2.GetShearLagFactor();
}
else if (N == 3)
{
if (bf > 2.0 / 3.0 * d)
{
U1 = 0.9;
}
else
{
U1 = 0.85;
}
}
else
{
U1 = 0.7;
}
// If Case 2 information is applicable
if (x_ob > 0 && l > 0)
{
ShearLagCase2 Case2 = new ShearLagCase2(x_ob, l);
U2 = Case2.GetShearLagFactor();
U = Math.Max(U1, U2);
}
else
{
U = U1;
}
return(U);
}
public double GetShearLagFactor(ShearLagCase Case, double x_bar, double b_plate, double l,
double B, double H, double A_g, double A_connected, bool IsOpenTensionSection)
{
ShearLagFactorBase shearLagCase;
switch (Case)
{
case ShearLagCase.Case1:
shearLagCase = new ShearLagCase1();
break;
case ShearLagCase.Case2:
shearLagCase = new ShearLagCase2(x_bar, l);
break;
case ShearLagCase.Case3:
shearLagCase = new ShearLagCase3();
break;
case ShearLagCase.Case4:
shearLagCase = new ShearLagCase4(b_plate, l);
break;
case ShearLagCase.Case5:
shearLagCase = new ShearLagCase5(B, l);
break;
case ShearLagCase.Case6a:
shearLagCase = new ShearLagCase6(true, B, H, l);
break;
case ShearLagCase.Case6b:
shearLagCase = new ShearLagCase6(false, B, H, l);
break;
case ShearLagCase.Case7a:
shearLagCase = new ShearLagCase7(2, H, b_plate, x_bar, l);
break;
case ShearLagCase.Case7b:
shearLagCase = new ShearLagCase7(3, H, b_plate, x_bar, l);
break;
case ShearLagCase.Case7c:
shearLagCase = new ShearLagCase7(4, H, b_plate, x_bar, l);
break;
case ShearLagCase.Case8a:
shearLagCase = new ShearLagCase8(2, x_bar, l);
break;
case ShearLagCase.Case8b:
shearLagCase = new ShearLagCase8(3, x_bar, l);
break;
case ShearLagCase.Case8c:
shearLagCase = new ShearLagCase8(4, x_bar, l);
break;
default:
shearLagCase = new ShearLagCase2(x_bar, l);
break;
}
double U = shearLagCase.GetShearLagFactor();
if (IsOpenTensionSection == false)
{
return(U);
}
else
{
//AISC section D3
//For open cross sections such as W, M, S, C or HP shapes, WTs, STs, and single and
//double angles, the shear lag factor, U, need not be less than the ratio of the gross area
//of the connected element(s) to the member gross area. This provision does not apply
//to closed sections, such as HSS sections, nor to plates
double Umax = A_connected / A_g;
U = U < Umax ? Umax : U;
return(U);
}
}
