|IxCube 4-10 form-finder module is able to relax a mesh into a shape with assigned prestress and/or tension. Not only the membrane can be specified but also the supporting steel, wood or concrete framework. The system uses a range of technologies to produce the final result based in a "self stressed" model. Membrane stress state, cable tension, beam bending moments and stiff plates are part of this global equilibrated system.
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ETFE roof for the Etiopia Council building. Robert Off Designer. Modelled and engineered with ixForten 4000
IxCube 4-10 has a number of Form-finding strategies for this purpose: Linear FDM: Linear Force Density Method controlled by the force density value C. The mesh is relaxed and all links end up with a positive tension proportional to the C value.
Brute Force FDM: The Brute Force FDM solver enables fixed force and fixed length links using a spare matrix solve technology that outperforms hundres of times the speed on the classic Non-Linear FDM solver.
NFDM method : This method uses the Natural Force Density Method developed by Prof. Ruy Marcelo Pauletti from the univerity of Brazil. It is a fast and robust technique able to relax triangle meshes with desired pre-stress very fast and a perfect tool for ETFE cushions other other classic membrane shapes.URM Solver: The Update Reference Strategy is a technique developed by prof. Bletzinger and enables direct form-finding over triangle and quad meshes. IsoTropic or Anisotropic membrane stress state can be specified and so natural minimal surfaces are easily shaped with this technology.
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2200 square meter tensile structure designed and engineered by Gerry D'Anza. Patterning and production by Loredana Di Benedetto
ixCube 4-10 : Example of Form-Finding a membrane using the Natural Force Density Method