Issues with point load

Hello,

I'm having issues with applying point loads to my truss model. When I use a gravity load it works fine. However, when I try to apply multiple points which are in my model I am getting an error on the assemble. The error reads "1. Solution exception:Could not find node at (-444.858938558345/11.1667168923624/72.4190861433771) where point-load number 0 is attached." I have attached pictures. In the first picture you can see I referenced the points in my model which I want to be loads. If anyone knows how to fix this issue that would be great. I can submit the definition as well but there are several linked portions which I figured would just make it difficult however upon request I can attach the rhino file with the definition.

Attachments:

help for karamba.PNG, 544 KB
help for karamba 2.PNG, 33 KB

Replies to This Discussion

Permalink Reply by Karamba3D on April 16, 2018 at 1:59pm

Hello Joe,

did you divide the elements so that the points where you want to apply the loads become nodes of the model?

Best,

Clemens

Permalink Reply by Joe Burleigh on April 16, 2018 at 2:19pm

No I did not. How would I go about doing this?

Permalink Reply by Karamba3D on April 16, 2018 at 4:31pm

Hello Joe,

you can simply split the lines in Rhino at the points before you bring it into Grasshopper.

best,

Matthew

Permalink Reply by Joe Burleigh on April 17, 2018 at 2:45pm

Thanks for your help. Also how do you determine the value for the force vector?

Permalink Reply by Karamba3D on April 17, 2018 at 3:45pm

Hi Joe,

you can use the construct point or construct vector component to set the amount of force in a specific direction.

Matthew

Permalink Reply by Joe Burleigh on April 17, 2018 at 3:52pm

Yes, I understand that. I was just wondering if there are any tips and tricks in estimating the amount of force which I should use. Sorry I am an architecture student and have little experience in engineering. Is there any method of prediction built into the program where I can input the materiality to get a general weight and then use this weight to determine the force?

Permalink Reply by Karamba3D on April 24, 2018 at 12:40am

Hi Joe,

there should be guides online that would be able to assist you with that. The loads also differ according to different country norms as well so you could look into the norms for your specific country too. To calculate the dead weight of material applied as a force, you will need to manually do this.

Matthew

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