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Laying a Truss, or Lighting Pipe across another Truss

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I'm trying to work out how to get a truss that is sat on top of another truss structure to be part of a system culculable by Braceworks. I was trying with Lighting Pipe, but I've changed to truss until I get my head around it. When I sit the new trusses on top of the existing truss structure, I get some Truss Connectors pop up, but when I right click on the main structure and select "Select System Objects" it doesn't include the new ones on top. 


If I hang some lights on the top truss and do a calcultaion I get a non supported error.


I've been working through the Mark Doubleday tutorial on the University about converting pipes to symbols, and then truss. I can't get it to work any way I try. Am I just being stupid here? If anyone can help me out that'd be great. Thank you.



Screenshot 2024-06-14 at 16.39.49.png

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  • Vectorworks, Inc Employee

Hi Chris,

First, ground supported structures are not yet supported/calculated.
As for select system object, each system may still be considered independent even though they have the truss connectors. Do you have a sample file to share?

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  • Vectorworks, Inc Employee

@Chris J Clarke
A quick way to check what is in a truss system is to use the change trim height of system command in the truss object properties,
The change dropdown menu gives you options to control what will be affected by the command, which will be hightlighted in your design, enabling you to see what is included in the truss system.

In you above example place deadhang bridles or hoist above each corner of the ground support, this will allow you to calculate the system, it won't tell you how the legs respond to the loads or the exact force exerted on the floor but you will see how the truss laid ontop and  supporting sections perform.

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Hi Guys,


Thanks for your responses. Sorry it's late in getting back, I've been ill. The joys of having a young child in nursery!


I think I'm making progress. The only thing I can't do now is move the lighting pipe to be above the outer chord of the short truss section. It makes me run it along the centre. Something in the back of my mind says that it's a limitation? IS it possible to run it along the outer chord rather than the centre?



Screenshot 2024-06-19 at 10.54.48.png

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@Scott C. Parker I've attached my file below. It's moving on quite well now, but I can't seem to get the lighting pipes to connect to a 1m or 0.5m truss on the two outer short truss runs. I have to use 0.25m bits of truss.


It must be somehting I'm doing wrong? I've been connecting using an offset of 64mm to get the pipes to sit up and look correct with my Doughty coupler symbol.

B360 - BBC Paris 2024 - BW Test.zip

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