Architectural shell on the closed circuit

The method of geometric shell modeling resting on four spatial contour with-holding segments of conic sections is given. For the surface forming one-parameter set of curves of the second order with variable eccentricity is used. Shell form management is provided by changing the shape of the auxiliary ruled surfaces. The example of construction of a composite shell for spatial reference circuit with-holding link with a break is given. The comparison of the membranes obtained by the proposed method and bicubic spline interpolation is performed. It is shown that when using spline interpolation on the design surface one can see unacceptable oscillations.