Forums >> Revit Building >> Technical Support >> Rebar in Stepped Footing

James K Hinton, CPBD

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Joined: Mon, Sep 6, 2004
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Trying to extend my feeble brain in family creation. I am trying to create a parametric sized footing and height of step with a variable amount of zbars and cont. rebar. I have managed to get the width, depth and ht. of step parametric along with getting the rebar an adjustable distance from sides of footing and have the zbars adjust with the height of step as well as having the profiles of each zbar, cont. bars and the closed rebar tie to an adjustable radius. This all works good. Now I am trying to add quantity of bars to the stepped configuration. I hope all this is making sense, The narrow width footings is OK with the 2 sets of rebar controlled by distance from the edge of footing parameter. The wider footings might require a set in the center of the footing as in 3 sets, even wider might footings might require 4,5 or 6 sets of rebars. I have been able to set new family types up as 2 rebar set,3 rebar set,4 rebar set, 5 rebar set and 6 rebar set. These all adjust with a parameter called # of rebars to 2,3,4,5,6 accordingly. How do I make the actual geometry of the bars change with the quantity of bars? I got stuck on making the center sets visible with the correct quantity type. In other words the 2 set rebars works great. I can place a 3rd set on the center reference plane but I can not make it only visible on the 3 rebar set type. I beleive this would be very beneficial to us in relaying how we expect a contractor to install rebars in an otherwise confusing 2d set of documents if we had a 3d model of this to go along with our 2d CD's. The stepped footing w/rebar.rfa is posted here at Revit City under Concrete cast in place section All help will be very much appreciated.

James

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James K. Hinton, CPBD

Reynolds, GA

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Mr Spot

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Joined: Mon, Jan 12, 2004
2889 Posts

You need to setup the members that need to multiply as a nested family and set them as part of an array with linked parameters to the host family.  Then add an integer parameter to the array to control the number of elements.  You can then set a formula to calculate the number of bars based upon the width.

If you haven't already check out my array tutorial.  Important things to remember include constraining nested families to their defines origin references...

HTH.

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Chris.

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