Revit Truss family

[rahid_mullas]

There is a truss family which i created. the end bracings are different and the middle bracings are symmetrical. The end bracings are fine but the middle bracings are going inside each other. I need a formula to avoid the clash. When i say middle bracing, leaving the end bracings everything i am considering as middle bracings. I need forums help pls help me out. i am also attaching a family.

[Tom_Kunsman]

I've never had much luch with trying to make the web members parametric in regards to the length. Yes, I know several of the truss' that come with Revit do have some nested arrays and such.

I think you might be better off creating a truss layout for each specific span that you might need. A certain span can have multiple types.

[ToanDN]

Can you explain these formulas?  They don't look right to me.

[rahid_mullas]

@ToanDN So what i have done here is, I have taken initial ratio. for example if there are 2 lengths A=50 and B=100. So B/A = 2. So now if i change overall length i want this xyz element to increase or decrease with respect to 2 ratio.

[rahid_mullas]

@Tom_Kunsman In order to create separate length, the truss template doesnt consider nested families in that case how it is possible?

[rahid_mullas]

I am so sorry to everyone for replying so late. but pls do help me out with this.

[ToanDN]

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@rahid_mullas wrote:

@ToanDN So what i have done here is, I have taken initial ratio. for example if there are 2 lengths A=50 and B=100. So B/A = 2. So now if i change overall length i want this xyz element to increase or decrease with respect to 2 ratio.

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Your formulas don't look anything like what you explained.  What are the meaning of numbers like 15.66416 or 13.975068?  How on earth have you come up with them?

[rahid_mullas]

@ToanDN In this i wanted A to move in the ration with the length. so 25000/1596 will give you 15.66 as the ratio. so now if we change the length A will move in the ration of 15.66 with the length. But the problem is array clashed with the other element i need a formula that will maintain its position even when we change the length.

[ToanDN]

If you control A and B, then what is D doing in here?  D is given by the number of array, so it is not needed or being a reporting parameter.

[ToanDN]

Try this family.  It's 2024.

[rahid_mullas]

@ToanDN I loaded this family into the project and this is what happens. Even i tried to turn of the visibility of the vertical bracing it doesn't hide. your formula is impressive and your method is excellent can you pls rectify this error.

[ToanDN]

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@rahid_mullas wrote:

@ToanDN I loaded this family into the project and this is what happens. Even i tried to turn of the visibility of the vertical bracing it doesn't hide. your formula is impressive and your method is excellent can you pls rectify this error.

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If I remove them the family will break when the length changed.  You would need to manually delete the framing members for those webs.

[rahid_mullas]

So you are saying after loading them into the project i should delete this individual bracing.

[ToanDN · Accepted solution]

Yes that is what I am saying.

[rahid_mullas · Accepted solution]

Thanks