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Forums >> Revit Structure >> Technical Support >> Concrete pad footing moves with steel column
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Joined: Tue, May 12, 2009
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I have a steel column sitting atop a concrete pad footing. I added a concrete column on top of the footing and want to move the bottom of column to sit on top of the concrete column. Problem is, the pad footing wants to move with the bottom of column, even if I pin the pad footing to it's current location. Anyone know of a solution??
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Joined: Wed, Mar 12, 2008
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I don't really have a fix for you; foundations are tricky- especially when you've modeled things to where they should be. Here is something you could try, although I don't know how much success you will have with it. In a section view 1. Create a level for Top of Pier if you haven't already done so In a plan view 2. Select all of your pad footings with Piers and Columns 3. Copy 4. Edit your steel columns so that they have a typical base of t/pier elevation. You can re-adjust the base offset as required after you re-paste your footings. 5. Paste aligned. This should break the association between footings and steel columns. Vertical movement with your concrete piers should now establish some sort of relationship. FYI - I usually create a t/ pier elevation at the begining of my projects and constrain the steel columns to that level to avoid this. I also create a t/ftg elevation and constrain my piers from the tfe to tpe elevations I created. I usually end up erasing these levels, but use them for this purpose.
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Joined: Thu, Jan 6, 2011
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Isolated footings have to be attached to any kind of columns, so if first you add all your piers in the same place as the steel columns then you can go and change the steel columns to be on top of the pier. This time the footing will mive with it, but since now you have a concrete column below you will be able to change of the top of footing elevation to be the bottom of concrete pier. I know it is cumbersome but footings need to be attached to cilumns.
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Joined: Mon, Jan 12, 2004
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Structure can be a pain with its auto-constraints and auto joining!! Wish it would let us define when we want something to connect... Anyway, select the footing, use the cut tool to put in on the clipboard. Adjust the column base, then paste aligned-->Same Place and the footing should be back in the correct location and no longer connected to your column... hopefully.
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Chris.
Co-Founder | BIM Consultant | Software Designer  B. Arch)
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I use the following method: place the steel columns, place the foundation pads. Regardless of the level I attach the foundations pads to, they will jump to the bottom of columns - ugly!. In a section view I draw a detail line to the level I want the top of foundation to be, then I align the top of foundation to that (using "align" command), then delete the detail line. That seems to work for me but as Chris said, its a pitty we can't control what we attach to what. This way I can make steel columns embeded into concrete piles etc.
Hope that helps.
Cheers, Marian
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