• Modern, intuitive user interface.
• Multi-ring, multi-span analysis (no need to balance thrusts).
• Use a wide range of built-in and user-defined arch profiles.
• Include local defects such as mortar loss and weak masonry.
• Undertake support settlement analyses.
• View moment, shear and normal force diagrams.
• Allocate separate properties to nearsurface and deep fill.
• Model reinforcement.

LimitState RING uses rigorous mathematical optimization to directly identify a wide range of potential modes of response, including those involving:

• Hinging and/or masonry failure.
• Radial sliding.
• Ring separation.
• Single or multi-spans.
• Support movement.

More info.

• Accurate, durable joins between surfaces.
• Parametric variation: MultiSurf updates the entire model when you change underlying objects.
• A surface for every purpose: 30 surface types let you use the right surface for every aspect of your design (not limited to NURBS like other applications).
• Fairing tools: curvature profile and surface curvatures displays help you refine your design.

Export: DXF, IGES, POV-Ray rendering files, VRML; to AeroHydro programs: MSDEV developable plate expansion, MSPLEX compound-curved plate expansion, HYDRO hydrostatics, OFE offset file editor, AHVPP sailboat performance analysis.

Import: DXF, IGES; FL/2B, Autoship, MaxSurf, FastYacht files.

General calculations: weight schedule, mass properties, angles, clearance, distance of points.

Special marine design tools: upright hydrostatics, ship lines, offset files.

There are some demos. You can find them here.