Join Eric Wing for an in-depth discussion in this video Configuring in-place concrete footing steps, part of Creating Concrete Buildings with Revit Structure.
So when Revit steps a footing, it doesn't quite do it right. It's cool what does it do, but something is certainly missing. From time to time, Revit's going to miss some small detail that you'll need to do yourself. This is where having the ability to create a family comes into play. There are two different ways to create a family. One is to actually start with a Revit family template. And create an object that is loaded into your model once you're done and use. The second is to physically create the family right in your current model.
This is called an in place family. The objective of this video is to create an in place family. Lets go to the West elevation looking at our step footing condition. What we're going to do is we're going to actually model a little chunk in place of concrete, that's going to make it look like this footing was actually carved out of earth with the backhoe. To do that, go to the Structure tab. Under Component. Click the drop-down right here, and let's go Model In Place. We need to tell Revit what we expect this family to be.
So let's scroll down until we find Structural Foundations, and select it. Let's click OK. For the name, let's call it Stepped Footing. Let's click OK again. Under Structural Foundations, let's make sure the Material for Model Behavior. Is going to be Concrete. Click Apply. Now the next thing we want to do is physically create an extrusion. Notice that our entire toolbar has been changed into the Family Editor. On the Create tab, click the Extrusion button.
Revit doesn't understand where exactly we want to place this, so we need to specify a work plane, so under Specify a New Work Plane we're going to click Pick a plane and we're going to click OK. Hover over the center of this footing until you see the entire footing highlight, then pick that. What we've done is that we've established the front face of our extrusion is going to be the front face of this footing. For the Extrusion End. Let's type in minus 44". Let's hit Enter. For the material, let's click into where it says By Category.
Let's click on the Builder button, and the Material browser. type in Concrete. Let's select Concrete, Cast in Place gray. Let's click OK. Now what I'd like to do is, let's keep the Line button selected. We're going to draw a line over about 12". I'm going to come up at a 45 degree angle and let it intersect with the top footing. I'm going to draw my line back, I'm going to draw my line down. I'm going to hit Escape a couple times. I'm going to pick a window around my lines, and I'm going to click the Copy button. Make sure Constrain is turned off.
We don't need Multiple on for this maneuver. I'm going to click this endpoint here. I'm going to copy it right down to here. Then I'm going to hit Escape a couple times. Let's mirror these to the other side. I'm going to pick a window, run my two concrete footings. I'm going to click my Mirror Pick Axis button, or I'm going to type mm. I'm going to pick this column centerline, and our footings are mirrored over to the other side. Once I've got that, I'm going to simply click on Finish Edit Mode. I'm going to hit Escape a couple times. Now we're still in our family, so I'm going to click on Finish Model.
It puts them in. One thing we need to do, however, is join these footings so we get rid of all these extra lines. On the Modified tab, click the Join button. Select the family you just created, now select the footing that's already in place, and click Escape a couple times. Now Revit shows it as one continuous pour. Go to a 3D view. Let's zoom in on our creation. This is how Revit likes to step down footings. So, when Revit only gets you to the five yard line, sometimes you need to keep the ball and run with it. To close out, let's go back down to our level one plan.
Let's click on our Close Hidden Windows button. Let's save our model.
- Creating levels
- Creating a structural grid
- Adding single and multiple columns
- Laying foundations
- Creating perimeter framing and pan joists
- Placing concrete slabs
- Reinforcing with rebar