scissor structure in karamba

Welcome colleagues
if you can you please help with an error occurs in the algorithm

Grasshopper gives the following error

error

1. Singular Stiffness-matrix: Can not solve static system.
Make sure that boundary conditions are set so that the structure can not move in rigid body modes.
When you analyze a flat shell structure lock the rotation perpendicular to the plate in at least one node.
Use the 'Eigen Modes'-component and activate the display of local coordinate axes: The first eigenmode will be the rigid body motion.

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SCISSOR1.gh, 33 KB

Replies to This Discussion

Permalink Reply by Karamba3D on June 8, 2015 at 11:56pm

Hi,

your structure consists of eight unconnected parts which causes kinematic modes (see attached definition). In Karamba elements are connected at their end- or corner points only.

There is a definition with a scissor structure in the examples that come with Karamba.

Best,

Clemens

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