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algorithmic modeling for Rhino

Sofia
  • Perugia
  • Italy
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cable for tensile structure

Hello everyone! For my thesis I'm studying glass facades supported by tensile structures, so I'm trying to replicate the behavior of cables in a vertical facade in Grasshopper, in particular with…Continue

Started Dec 28, 2016

 

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karamba replied to Sofia's discussion 3D cable net in the group Karamba
"Hello Sofia, could you please reduce the size of the problem as much as possible (to e.g. one vertical and one horizontal row of cables) so that it is easier to test it? Best, Clemens"
Mar 6
Sofia added a discussion to the group Karamba
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3D cable net

Hello!I'm trying to calculate the max deformation and the max axial force of a cable net 3D, under a (point) wind load and pretension, using first "Large-Deformation" component and then "Analyze Th.II" for the forces. In the 2D cable net there wasn't any problem, but in this if I set the pretension over about "1" the cables explode, but the value that I need is "2.6". May it could be a problem of joints between the elements? Thanks in advance,SofiaSee More
Feb 24
karamba replied to Sofia's discussion cable fot tensile structure in the group Karamba
"Hi Sofia, the AnalyzeThII-component takes account of the geometric stiffness due to axial forces but still assumes small displacements. This means that transverse beam or truss displacements do not result in additional axial strains (see e.g.…"
Feb 21
Sofia replied to Sofia's discussion cable fot tensile structure in the group Karamba
"Hi Clemens, you were right because it was a problem of combination of loads and geometry, thank you.I have a question about how Karamba treats the element rope/cable: using the "Beam Resultant Forces" component I see that in my model…"
Feb 20
karamba replied to Sofia's discussion cable fot tensile structure in the group Karamba
"Hi Sofia, the reason for the small deflections is the geometry of the glass plane in combination with the support and loading conditions you chose. Make sure that the support conditions are realistic; also include a wind load case with wind only on…"
Feb 12
Sofia replied to Sofia's discussion cable fot tensile structure in the group Karamba
"Hi Clemens, Thank you for the help with calbe truss, it was also a problem of visualization of the model, in which I'm not so able as you can see! Anyway in the curve model I've tried to change the base-curve, and when I create a…"
Feb 9
karamba replied to Sofia's discussion cable fot tensile structure in the group Karamba
"Hi Sofia, try to make the model as small as possible for testing. Consider e.g. only one vertical cable truss. With the 'Buckling Modes'-component one can see, that the cable trusses buckle sideways. In case the connectors are modeled as…"
Feb 7
Sofia replied to Sofia's discussion cable fot tensile structure in the group Karamba
"Hi Clemens, when I try to switch "false" the bending toggle, the Analyze-component says me that structural system buckles in 75 modes. And if I stay "true" there are the deformation because of the gravity, as you can see in…"
Feb 7
karamba replied to Sofia's discussion cable fot tensile structure in the group Karamba
"Hi Sofia, when you use beam elements for the cables and do not prestress them they show large deflections due to their small bending stgiffness. Is this what you mean by 'strange deformations'`? You can remedy this by switching off bending…"
Jan 26
Sofia replied to Sofia's discussion cable fot tensile structure in the group Karamba
"Hi Clemens,I have a doubt about loads: till now I didn't use Gravity-load, but it's necessary to simulate the weight of the structure? Because when I try to use it there are strange deformations, on cables expecially!  And a second…"
Jan 26
karamba replied to Sofia's discussion cable fot tensile structure in the group Karamba
"Hello Sofia, there were duplicate points when you assembled the structure. This partly disconnected the substructure form the glass plane.In order to get a realistic response for the glass plane the mesh needs to be fine enough. There were also some…"
Jan 23
Sofia replied to Sofia's discussion cable fot tensile structure in the group Karamba
"Hello Clemens! I modified the file that you have created and I think now it works, so thank you! But now I have to do the same with more complex shapes, like cable trusses.In this case I can't understand the strange distribution of the glass…"
Jan 22
karamba replied to Sofia's discussion cable fot tensile structure in the group Karamba
"Hello Sofia, you did not flatten the input of the Assemble component, which resulted in multiple models. There were some other minor issues (see annotation of groups in attached definition). The cables lie in the same plane as the glass. I think…"
Jan 16
Sofia replied to Sofia's discussion cable fot tensile structure in the group Karamba
"Hello Clemens, thank you so much for the replay!I'm trying to modify the algorithm separating the cable-beams from the glass-mesh and creating connections-beams between them. I've found the Joint-component to connect both but it…"
Jan 12
karamba replied to Sofia's discussion cable fot tensile structure in the group Karamba
"Hello Sofia, I think you forgot to flatten the input of the 'Assemble'-component which results in multiple models. When you give truss elements an initial tensile prestress and calculate them using 'Analyze Th II' they have a…"
Jan 3
Sofia added a discussion to the group Karamba
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cable fot tensile structure

Hello everyone! For my thesis I'm studying glass facades supported by tensile structures, so I'm trying to replicate the behavior of cables in a vertical facade in Grasshopper, in particular with Karamba. By now I've done a beam component for the cables and a mesh that simulates the glass.The forces I want in my cables are the pretension, the weight of glass applied to attacks and the wind as a point load on the attacks. On the glass I want to simulate the wind as a mesh load. So my question…See More
Dec 30, 2016

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