Showing posts with label Structure. Show all posts
Showing posts with label Structure. Show all posts

Thursday, May 21, 2020

Revit 2021 - W Shapes-Column Family is Missing

The stock imperial architecture template has the W Shapes-Column family loaded with two types: W10X33 and W10X49. I was experimenting with new features and noticed the family isn't part of the 2021 content deployment, weird. I had to reload from the 2020 version to add a size.

If it's not one thing it's another.

Tuesday, June 18, 2019

Eccentricity of Wall Footing

I replied to a thread at AUGI regarding the Eccentricity parameter of a Wall Footing. They observed that Revit seemed to ignore their input and didn't understand what it was meant to do. In this case the width of the footing was less than the value they entered.

The parameter is intended to shift the footing over, from interior to the exterior face of the wall. The footing starts out centered on the wall above.

The maximum eccentricity is equal to (Footing Width/2)-(Wall Thickness/2).

The interior wall surface can be aligned (flush) with the interior face of the footing but not further, creating any overhang of the wall, which seems logical to me. A picture might help?

Thursday, May 23, 2019

Structural Column Disappears - Part Deux

Yesterday while trading messages with a friend we discussed my previous post about columns disappearing. He suspected it might explain the issue he was observing. After looking more closely it turned out that it doesn't. In his situation the structural columns were modeled the full height of the building and Join Geometry was used on walls, that passed through (overlapped) the columns, at each floor (level). The result: at some levels no column appeared while at others they do.

It was necessary to pull the walls back so they stop at the surface of the columns. Join Geometry allowed for the desired appearance and the columns reappeared at the other levels where they were missing earlier.

Monday, November 09, 2015

Copy Monitor Wall Location Line Selection

I mentioned in a previous post that 2016 quietly introduced a parameter that lets us choose which Location Line is important to reference when we use the Copy part of the Copy/Monitor features.

Now that I've been trying to use it regularly I'm running into a quirky situation since installing R2 (I can't say for certain it doesn't happen in the previous version too). When I select a wall it works on the just the first wall. When I choose additional walls I get this warning.

Initially I thought it was happening because I thought it is important to assign the Location Line of the walls in the source linked file to be the same as intended in the host file, but then I don't remember having to worry about that earlier...pause...

Then it occurred to me that whatever Location Line setting I used for the last wall I sketched, in the host model, might somehow influence the process. I tried that and I don't think that matters at all; and it shouldn't in my opinion.

After experimenting a bit further it only works reliably when I use the Multiple selection option to choose all the walls I want to use Copy/Monitor on. I've repeated this using stock content (Imperial) and Architectural and Structural templates. If you'd like to corroborate my findings please try these steps:
  • Start a project with the Architectural template
  • Create six walls with: Basic Wall Exterior - EIFS on Mtl. Stud
  • Use Location Line: Wall Centerline
  • Save the file as Test CM
  • Using the Structural template link Test CM
  • Create a Stud 2x6 wall type (6" because the stud layer in the linked wall is 6")
  • Start Copy/Monitor
  • Map the linked wall type to the host's Stud 2x6 wall type (in Options)
  • Choose Location Line: Core Face: Exterior (in Options too)
  • Start Copy and select one wall (no message)
  • Select another wall (Error message yes?)
I suspect the nature of wall joins is affecting whatever method they are using to evaluate the wall for the C/M process.
  • Use Undo and Start again before using Copy/Monitor
  • Set Options again, just to be sure
  • Start Copy
  • Select Multiple
  • Select all six walls
  • Click the little Finish button (no error?)
  • Click the big Finish button
Earlier I mentioned being concerned about the Location Line setting of the walls in the linked model. I tested for that by starting with walls in the linked model assigned to Location Line: Core Face: Exterior. It didn't make any difference in my testing (see next image). Fwiw, when I first saw this new option appear I did think that was what they intended us to do but Revit just places our version of the wall according to the chosen Location Line position, not according to what the source wall is actually assigned to.

Thinking about it further I realized that if we really could influence this by changing the value in the linked model it should have already been easy for us to use C/M; if they just allowed us to swap wall types based on their setting. Revit was biased to only use Wall Centerline, ignoring the others.

I was nearly convinced that all I had to do was make sure to select the walls using the Multiple option but then in another file it didn't seem to matter or help regardless. Then I noticed any wall I was successful using C/M on (picking them individually) but was touching a wall that generated the error message also needed to be eliminated so I could start again clean. When I used Multiple after getting back to a clean slate I was able to use Copy/Monitor without an error message.

I conclude that the safest way to ensure Copy/Monitor doesn't generate a confusing warning is to isolate all the walls we want to use C/M on and choose the Multiple option. Remember the little Finish button before using the Big Finish button!

Also remember that anytime C/M gets ornery we can just use Stop Monitoring on the affected elements. Fix the problem elements and then use the Monitor part of C/M to let Revit start watching them again.

Tuesday, June 09, 2015

Placing Columns - At Grids Option does not Work

When we are placing structural columns you'll find that there is a button for the At Grids option.

All we have to do is select at least one pair of grids to define intersection locations for Revit to place columns for us quickly. If we select all our grids we get a column at every intersection, FAST. Sometimes it is faster to do that and delete a couple we might not really need than to carefully place a column at grid intersections one at a time.

When we use this option there is a condition that renders it numb or ambivalent to our wishes. Put another way we can select the option, select grids yet when we click Finish to create the columns nothing happens, no columns.

If we place columns from level 1 to level 2 but then increase the height of the columns to allow for additional height to accommodate a splice above the floor slab Revit will think there are already columns at these grid intersections when we attempt to create columns from Level 2 to 3. When a column is found by Revit within the primary range of the view Revit disregards the intersection where this column is, it isn't a valid location for a new column.

To get around this it is probably best to alter their offsets after they are all in place. Place all the columns and then reconcile where the splices should occur.

Thursday, May 14, 2015

Revit 2016 - Truss Chord Rotation

When we rotate a truss we can either allow the chords to rotate with the truss or stay aligned with the truss placement plane (usually vertical).

Thursday, December 11, 2014

New Canadian CISC Standard 9.2 Structural Shapes Available

If you rely on Canadian size structural shapes for your work then you'll wish you had a valid subscription if you don't. The Canadian Structural Content Extension for Autodesk® Revit® RST 2015 software provides the latest CISC standard 9.2 hot rolled structural steel shapes is available in the Subscription Center for you to download. This extends the current out-of-the-box content offering, reducing the need for users to seek alternative sources of content.

This was announced via the BIM & BEAM blog earlier today.

I have to admit my first reaction was that it ought to be available regardless of subscription status. I'd prefer that anybody using Revit Structure and relying on accurate structural shapes also has the latest shapes to use. If it is truly supplemental, as opposed to updating critical existing shapes, then perhaps it is a subscription benefit?