Constrain a girder to a lower slab level

[t.sautierr]

I'd like to know how it is possible to make a constraint on the top flange of a girder so that it follows the lower slab level when I thicken it.

Other way to say it : how to set the  offset of a beam to a paramter which is the slab thickness in this case.

Any general procedure to be able to set parameter of a family following another fmily paramter would be very appreciated also.

[zijie.chen]

Hi t.sautier,

    I think you can use Dynamo to make it, i did a small test( see attachment), and its ok, maybe you can try it and do it better. thank you!

[t.sautierr]

Thanks a lot, I'll try it and give feedback!

[Anonymous]

I believe you may be able to accomplish this also by using global parameters.

Set up a dimension for the thickness of the slab and create a global parameter using this dimension. Then you can link this global parameter to your beam offset. That way whenever you change the thickness of the slab the beam will be offset accordingly.

[zijie.chen]

hi evi_mata,

yes, I try it before,but i can`t find the link location to the global parameter(see attachment).Can you give me a step in the operation?thank you!

[Anonymous · Accepted solution]

hello @zijie.chen,

I think you should be using the "Z Offset Value" parameter below. Also since the global parameter from the slab thickness is positive, when you link it, your beam will move up. So you have to create one more parameter to turn that value into a negative one and then link it to the beam. Below is a sample file of how I have been doing this so far. Please let me know if there is a better way.

Hope this helps.

[zijie.chen]

Hi, @t.sautierr

    Thank you.

[t.sautierr]

Hi,

I've tried to see what you have done to share this useful trick.

However I can't figure out :

How do you have create this constraint :

How the beam offsset is linked to this constraint :

I couldn't find this parameter in the global parameter :

[zijie.chen · Accepted solution]

Hi, 

    please see the attachment, thank you!

[t.sautierr]

Perfect, all understood! Sorry for those questions, I 'am only engineer and this was beyond my revit skills!