Karamba3D

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)

2 emergent problem to solve in karambaa

problem in analysis old building and construction in reality

problem1 how to describe the line of beam, and the extension part of beam (in reality all of them are not connected in axis of the beam)

problem2 how to describe the beam fix in wall or pillar, (in karamba  the wall might be define by one surface with karamba cross section component,   so   how to do with the beam?  extent to wall ?                    

in karamba pillar is defined by axis line with cross section component,but the beam alway not on the axis of the pillar , so how to do with it in reality)

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    Karamba3D

    Dear Jiaxing,

    it is possible to define eccentricities on beam cross sections. This can be done either per beam or per cross section (see manual).

    By default elements which meet at a common point are rigidly connected. In order to solve problem 2 extend the line to the endpoint of the pillar.

    For joining a beam with a wall use Karamba's 'Mesh Breps'-component. Plug the endpoint of your beam into the input-plug 'IPts' to make it a node of the mesh which can then be transformed into a patch of shell elements. Without further precautions this will however lead to a stress singularity at the connection point. In the finite element model the beam acts in relation toi the shel elements like an infinitely sharp needle. Thus the stiffness of the connection will tend to zero with increasing mesh refinement. For a proper connection one has to embed a short beam piece in the wall and connect the incoming beam to that.

    Best,

    Clemens

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      jiaxing

      Dear clemens

      thank u so much for this solution of eccentricity. it can solve my problem now.

      and I have another question about the cross joint cr-start ct-end

      how to identify the stiffness above, do we have some standard?

      now I need to define some typology of hinge in karamba, didn't test those before, if you could provide some basic cases set up to hinge part of steel joint i would really appreciate that

      best best best to vienna

      from bejing Lu

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