Im modelling 2cell box girder bridge for railway. As box girder outer web is inclined i have to model tendons in sofiplus in 3D as spline geometry. The radius of curvature given by sofiplus report as shown in fig is with respect to both horizontal and vertical becuase im unable to verify with hand calculation and if its 3D radius of curvature how should I justify with minimum allowed radius of curvature allowed by PT vendors.