public SecProp CalculateSecProp()
{
List <SecProp> SecPropList = new List <SecProp>();
foreach (IShape shape in ShapeList)
{
SecPropList.Add(shape.CalculateSecProp());
}
;
return(SectionElements.SecProp_Section(SecPropList));
}
public virtual Coordinate GlobalPointCoordinate(string PointID)
{
//Returns the coordinate of defined point
//takes into account translation (defined by properties xp & yp)
//and rotation (defined by property theta)
Coordinate pnt1_shp = LocalPointCoordinate(point);
Coordinate pnt2_shp = LocalPointCoordinate(PointID);
Coordinate point1Coordinate = SectionElements.ConvertXYtoCoordinate(xp, yp);
Coordinate pnt2_global = SectionElements.TransformCoordinate(point1Coordinate, pnt1_shp, pnt2_shp, theta, mirrorX, mirrorY);
return(pnt2_global);
}
public virtual SecProp CalculateSecProp()
{
double E = Material.E;
double _E = E;
if (E == 0)
{
_E = 1E-10;
}
SecProp SP_shape = ShapeSecProp();
//find center of gravity
Coordinate cg_global = GetGlobalCGcoord();
double xcg = cg_global.x;
double ycg = cg_global.y;
//Shape Section Properties (before rotation)
double Ixx_sh = SP_shape.EIxx / _E;
double Iyy_sh = SP_shape.EIyy / _E;
double Ixy_sh = SP_shape.EIxy / _E;
//adjust for shape mirroring (if both are true then Ixy_l is positive again)
if (mirrorX)
{
Ixy_sh = -1 * Ixy_sh;
}
if (mirrorY)
{
Ixy_sh = -1 * Ixy_sh;
}
//Local Section Properties (after rotation)
double[] Irotated = SectionElements.RotatedElementProperties(Ixx_sh, Iyy_sh, Ixy_sh, theta);
double Ixx_l = Irotated[0];
double Iyy_l = Irotated[1];
double Ixy_l = Irotated[2];
double thetap = SectionElements.Theta_Principal(Ixx_l, Iyy_l, Ixy_l);
double[] Iprincipal = SectionElements.RotatedAxesProperties(Ixx_l, Iyy_l, Ixy_l, thetap);
double I1p = Iprincipal[0];
double I2p = Iprincipal[1];
double A = SP_shape.EA / _E;
SecProp sp = new SecProp
{
Xcg = xcg,
Ycg = ycg,
EA = E * A,
EIxx = E * Ixx_l,
EIyy = E * Iyy_l,
EIxy = E * Ixy_l,
EI1p = E * I1p,
EI2p = E * I2p,
thetap = thetap
};
return(sp);
}
