Karamba3D

1118 members

Description

Karamba3D is a parametric structural engineering tool which provides accurate analysis of spatial trusses, frames and shells.

Current Version: 1.3.2 (July 9 2019)

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scissor structure in karamba

by Gotzman

Jun 8, 2015

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.

  • up

    Karamba3D

    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

     

    Jun 8, 2015