Transcript
00:04
After completing this lesson, you will be able to understand structural framing, understand structural usage, and create concrete and steel beams.
00:14
The objective domains covered are, 1.1e, work with structural framing and connections.
00:22
Beams are load-bearing structural elements that form an important part of structural framing systems.
00:28
They must primarily resist bending and axial loads, and are often connected to columns and walls to transfer the loads to other structural elements.
00:37
Beams can be formed from a variety of materials such as in-situ concrete, precast concrete, steel, or timber.
00:45
The type of material used has an important effect on how elements are joined to other elements.
00:52
This property is called the model behavior and it's set in the Revit family parameters.
00:57
In the example shown, a concrete frame will join and become monolithic,
01:01
but other concrete members such as precast, steel, or timber will have a gap between the elements.
01:10
The structural usage of a beam determines its rank.
01:13
A girder being a primary member.
01:15
A joist being a secondary member.
01:17
And the purlin being a tertiary member.
01:20
Revit automatically detects the structural usage based on what the beam is connected with.
01:26
If no connection exists on one or both ends, then Revit will set the usage to other.
01:31
However, structural usage can be overridden, if required.
01:38
Go ahead and open up the file 010-Work with structural framing.
01:43
The model will open up in the First Floor plan.
01:48
Our first task is to draw some girders in the front section of the model.
01:55
On the Structure ribbon, let's select Beam.
02:01
On the Context ribbon, you'll note that we have the ability to load a new family.
02:06
We have our Draw panel displayed with various different drafting tools.
02:10
We can place our beams on grids and also tag those beams as we place them.
02:17
On the Options bar, the placement plane is the level that the beams will be sitting on.
02:22
By default this will match the floor plane.
02:24
So in this case, we're on level 01-First Floor, but you can see here that we can override and change that, if we require.
02:33
The structural usage is set to automatic, so Revit will auto-detect the structural usage of the framing based on what I model the beams between.
02:42
However, I could override this, if required.
02:47
You'd also notice here that I have the Chain option switched on.
02:52
In the Properties palette, in the type selector, go ahead and select W16X26.
03:02
As I model my beam, you'll note I'm going to snap from the column midpoint to the column endpoint here.
03:11
Before I go too much further, let's open up the 3D View and have a look at how this beam has been modeled.
03:20
You'll note here that, although, I snapped from column center to column center, the beam is, in fact, cut back to the columns.
03:29
The analytical model will still remain connected to those column centers,
03:33
but the physical size of the beam will cut back to the bounding box of the column.
03:39
This is due to the material usage of our beam.
03:43
Ok, let's switch back to the First Floor plan.
03:48
We'll now continue to draw some more girders.
03:52
Here, I'm going to select the original girder I've just drawn.
03:56
And up on the Context ribbon, I'm going to click Create Similar.
04:03
We can now draw our second girder.
04:10
I would now like to create the rolled beam around the front of the structure.
04:15
To do this, I can select the Start-End-Radius Arc.
04:20
And then go ahead and snap to the column endpoint, the column endpoint here, and finally the endpoint on this raking column here.
04:33
Again, if we look in 3D, we can now see our beams are modeled.
04:40
Next, we're going to model an in-situ beam across this part of the structure to give the floor slab a little bit of extra support.
04:49
So let's return back to the First Floor plan.
04:54
On the Structure ribbon, let's select Beam.
04:59
In the Properties palette, we're now going to ensure that we have Concrete-Rectangular Beam 12"x24" selected.
05:08
We can now draw our concrete beam between the column midpoints.
05:15
Notice that the difference here is this in-situ beam would join and become monolithic to the column.
05:26
Next, we investigate the difference between a girder, a joist, and a purlin.
05:32
To do this, on the Structure ribbon, let's select the Beam command.
05:38
In the Properties palette, click the Type Selector.
05:42
We're going to change our section to W12X26.
05:48
Now, when I modeled the framing here, this slab is slightly lower because it's a steel deck.
05:54
So what I can do here is change my placement plane and you'll notice here, I already have a reference plane set up called 01-Top Of Steel.
06:04
Even though I'm on the First Floor plan when I created this structural framing, it will now be constrained to that reference plane.
06:12
So now I'm going to model my girders.
06:20
If I select one of the girders that I just created here, in the Properties palette, you'll note that the structural usage is set to girder.
06:31
We're now going to create some joists across this framing system.
06:35
So once again, we can select our Beam, we'll select Create Similar.
06:41
Now just for this example here, I'm going to create a joist in between the two primary beams.
06:47
And I'll create a second one through here.
06:51
If I select this member, you'll now note that the structural usage is set to joist.
06:59
If I now create another beam, this time I'm going to span between the two joists,
07:05
and we then go ahead and select that member, you can now see the structural usage is set to a purlin.
07:11
If I create another beam and I just model this without connecting it to any other elements,
07:18
and I select that beam, you'll notice the structural usage is set to other.
07:22
Here, of course, we can change that though.
07:25
I could go back and say actually it's a girder.
07:28
The significance of this is it can determine how the structural framing looks in a coarse level of detail.
07:35
If I temporarily switch to coarse level of detail and I toggle on Thick Lines,
07:42
you can now see clearly we have different thicknesses for our structural framing.
07:46
Now this can be set up in the object styles and you don't have to accept this style.
07:51
But you can see each of the different structural usages will display differently with this particular template.
07:58
Now, of course, if I don't want that to happen, I could simply override.
08:01
So here, I could set this to a joist and you can see the appearance now changes.
00:04
After completing this lesson, you will be able to understand structural framing, understand structural usage, and create concrete and steel beams.
00:14
The objective domains covered are, 1.1e, work with structural framing and connections.
00:22
Beams are load-bearing structural elements that form an important part of structural framing systems.
00:28
They must primarily resist bending and axial loads, and are often connected to columns and walls to transfer the loads to other structural elements.
00:37
Beams can be formed from a variety of materials such as in-situ concrete, precast concrete, steel, or timber.
00:45
The type of material used has an important effect on how elements are joined to other elements.
00:52
This property is called the model behavior and it's set in the Revit family parameters.
00:57
In the example shown, a concrete frame will join and become monolithic,
01:01
but other concrete members such as precast, steel, or timber will have a gap between the elements.
01:10
The structural usage of a beam determines its rank.
01:13
A girder being a primary member.
01:15
A joist being a secondary member.
01:17
And the purlin being a tertiary member.
01:20
Revit automatically detects the structural usage based on what the beam is connected with.
01:26
If no connection exists on one or both ends, then Revit will set the usage to other.
01:31
However, structural usage can be overridden, if required.
01:38
Go ahead and open up the file 010-Work with structural framing.
01:43
The model will open up in the First Floor plan.
01:48
Our first task is to draw some girders in the front section of the model.
01:55
On the Structure ribbon, let's select Beam.
02:01
On the Context ribbon, you'll note that we have the ability to load a new family.
02:06
We have our Draw panel displayed with various different drafting tools.
02:10
We can place our beams on grids and also tag those beams as we place them.
02:17
On the Options bar, the placement plane is the level that the beams will be sitting on.
02:22
By default this will match the floor plane.
02:24
So in this case, we're on level 01-First Floor, but you can see here that we can override and change that, if we require.
02:33
The structural usage is set to automatic, so Revit will auto-detect the structural usage of the framing based on what I model the beams between.
02:42
However, I could override this, if required.
02:47
You'd also notice here that I have the Chain option switched on.
02:52
In the Properties palette, in the type selector, go ahead and select W16X26.
03:02
As I model my beam, you'll note I'm going to snap from the column midpoint to the column endpoint here.
03:11
Before I go too much further, let's open up the 3D View and have a look at how this beam has been modeled.
03:20
You'll note here that, although, I snapped from column center to column center, the beam is, in fact, cut back to the columns.
03:29
The analytical model will still remain connected to those column centers,
03:33
but the physical size of the beam will cut back to the bounding box of the column.
03:39
This is due to the material usage of our beam.
03:43
Ok, let's switch back to the First Floor plan.
03:48
We'll now continue to draw some more girders.
03:52
Here, I'm going to select the original girder I've just drawn.
03:56
And up on the Context ribbon, I'm going to click Create Similar.
04:03
We can now draw our second girder.
04:10
I would now like to create the rolled beam around the front of the structure.
04:15
To do this, I can select the Start-End-Radius Arc.
04:20
And then go ahead and snap to the column endpoint, the column endpoint here, and finally the endpoint on this raking column here.
04:33
Again, if we look in 3D, we can now see our beams are modeled.
04:40
Next, we're going to model an in-situ beam across this part of the structure to give the floor slab a little bit of extra support.
04:49
So let's return back to the First Floor plan.
04:54
On the Structure ribbon, let's select Beam.
04:59
In the Properties palette, we're now going to ensure that we have Concrete-Rectangular Beam 12"x24" selected.
05:08
We can now draw our concrete beam between the column midpoints.
05:15
Notice that the difference here is this in-situ beam would join and become monolithic to the column.
05:26
Next, we investigate the difference between a girder, a joist, and a purlin.
05:32
To do this, on the Structure ribbon, let's select the Beam command.
05:38
In the Properties palette, click the Type Selector.
05:42
We're going to change our section to W12X26.
05:48
Now, when I modeled the framing here, this slab is slightly lower because it's a steel deck.
05:54
So what I can do here is change my placement plane and you'll notice here, I already have a reference plane set up called 01-Top Of Steel.
06:04
Even though I'm on the First Floor plan when I created this structural framing, it will now be constrained to that reference plane.
06:12
So now I'm going to model my girders.
06:20
If I select one of the girders that I just created here, in the Properties palette, you'll note that the structural usage is set to girder.
06:31
We're now going to create some joists across this framing system.
06:35
So once again, we can select our Beam, we'll select Create Similar.
06:41
Now just for this example here, I'm going to create a joist in between the two primary beams.
06:47
And I'll create a second one through here.
06:51
If I select this member, you'll now note that the structural usage is set to joist.
06:59
If I now create another beam, this time I'm going to span between the two joists,
07:05
and we then go ahead and select that member, you can now see the structural usage is set to a purlin.
07:11
If I create another beam and I just model this without connecting it to any other elements,
07:18
and I select that beam, you'll notice the structural usage is set to other.
07:22
Here, of course, we can change that though.
07:25
I could go back and say actually it's a girder.
07:28
The significance of this is it can determine how the structural framing looks in a coarse level of detail.
07:35
If I temporarily switch to coarse level of detail and I toggle on Thick Lines,
07:42
you can now see clearly we have different thicknesses for our structural framing.
07:46
Now this can be set up in the object styles and you don't have to accept this style.
07:51
But you can see each of the different structural usages will display differently with this particular template.
07:58
Now, of course, if I don't want that to happen, I could simply override.
08:01
So here, I could set this to a joist and you can see the appearance now changes.
