Defining loads

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Transcript

00:01

PAWEL PULAK: Developing the analytical model

00:03

in Revit, Defining Loads.

00:06

In this video, we'll step through the process of defining

00:09

hosted line and area loads using specific load cases, including

00:14

dead, live, and wind loads.

00:17

We're working in the small Medical Center project.

00:20

In the Analyze tab, on the Analytical Model panel,

00:24

I'm clicking Load Cases.

00:26

And you can see the Load Cases that

00:28

are available predefined in the structural template,

00:32

they can also be defined here.

00:34

You can modify the name, the case number,

00:37

and assign a nature from the list that's there.

00:40

So there are existing ones like dead loads, live loads,

00:43

wind loads, and others.

00:46

Now, in the Analyze tab, on the Analytical Model panel,

00:50

I'm going to click Loads.

00:52

First of all, I want to add a hosted line load.

00:56

I'm verifying the load case is dead load.

00:60

And then I'm going to go ahead and type

01:02

in the size of the dead load that I want.

01:05

I'm now going to apply it to each of these rafter's

01:08

on the side of the building.

01:11

So this is a dead load that I'm applying here.

01:18

Now, I'm going to switch to a hosted area load.

01:21

I want to change the load case to a live load,

01:26

then I'm going to change the force to negative 0.05.

01:32

And I'm going to apply this to just the floors, not

01:35

the roof slabs, but all of the floor slabs in this building.

01:41

So over here on the back, there's a first floor slab.

01:44

And there's a second floor slab here as well.

01:49

I'm now going to move back to another line load.

01:52

I want this one to be wind, so I'm

01:56

going to change my load case to wind.

01:58

And I'm also going to change my forces.

02:02

Now, first of all, I'm going to change my Fz to 0.

02:06

And then I'm going to change my Fx to 0.2.

02:10

It's always important to remember

02:12

to check these things as you're working through.

02:18

Now, I'm going to apply this wind

02:21

load to the edge of that slab and the edge of these beams

02:25

here.

02:30

I'm going to change the force and make it a little bit more

02:33

powerful.

02:35

So I'm going to put this to 0.4.

02:38

And I'm now going to add that same load to the edge

02:41

of the roof slab out here.

02:43

You can see the difference in how long

02:46

the icon is there, showing the load.

02:50

Let's do another hosted area load.

02:54

This time, I'm checking to make sure I have--

02:56

OK, it's Fz.

02:57

We're still down in there, but I want this now

02:59

to be a smaller one, 0.2.

03:02

And I'm going to add that now to my outside slabs.

03:06

So these are roof slabs.

03:09

The one in the back is actually used as a roof garden.

03:15

One more line load.

03:17

We're going to have Fx set to

03:27

And I'm applying this load now to the one I had applied loads

03:31

to otherwise.

03:32

And so I'm adding this to all of these rafters in here.

03:37

So loads can be added, multiple loads can be added.

03:42

So you'd continue working through the model

03:43

now, adding the various loads you

03:45

need so you can get an accurate structural analysis when

03:49

you send the project to Robot or other analysis programs.

Video transcript

00:01

PAWEL PULAK: Developing the analytical model

00:03

in Revit, Defining Loads.

00:06

In this video, we'll step through the process of defining

00:09

hosted line and area loads using specific load cases, including

00:14

dead, live, and wind loads.

00:17

We're working in the small Medical Center project.

00:20

In the Analyze tab, on the Analytical Model panel,

00:24

I'm clicking Load Cases.

00:26

And you can see the Load Cases that

00:28

are available predefined in the structural template,

00:32

they can also be defined here.

00:34

You can modify the name, the case number,

00:37

and assign a nature from the list that's there.

00:40

So there are existing ones like dead loads, live loads,

00:43

wind loads, and others.

00:46

Now, in the Analyze tab, on the Analytical Model panel,

00:50

I'm going to click Loads.

00:52

First of all, I want to add a hosted line load.

00:56

I'm verifying the load case is dead load.

00:60

And then I'm going to go ahead and type

01:02

in the size of the dead load that I want.

01:05

I'm now going to apply it to each of these rafter's

01:08

on the side of the building.

01:11

So this is a dead load that I'm applying here.

01:18

Now, I'm going to switch to a hosted area load.

01:21

I want to change the load case to a live load,

01:26

then I'm going to change the force to negative 0.05.

01:32

And I'm going to apply this to just the floors, not

01:35

the roof slabs, but all of the floor slabs in this building.

01:41

So over here on the back, there's a first floor slab.

01:44

And there's a second floor slab here as well.

01:49

I'm now going to move back to another line load.

01:52

I want this one to be wind, so I'm

01:56

going to change my load case to wind.

01:58

And I'm also going to change my forces.

02:02

Now, first of all, I'm going to change my Fz to 0.

02:06

And then I'm going to change my Fx to 0.2.

02:10

It's always important to remember

02:12

to check these things as you're working through.

02:18

Now, I'm going to apply this wind

02:21

load to the edge of that slab and the edge of these beams

02:25

here.

02:30

I'm going to change the force and make it a little bit more

02:33

powerful.

02:35

So I'm going to put this to 0.4.

02:38

And I'm now going to add that same load to the edge

02:41

of the roof slab out here.

02:43

You can see the difference in how long

02:46

the icon is there, showing the load.

02:50

Let's do another hosted area load.

02:54

This time, I'm checking to make sure I have--

02:56

OK, it's Fz.

02:57

We're still down in there, but I want this now

02:59

to be a smaller one, 0.2.

03:02

And I'm going to add that now to my outside slabs.

03:06

So these are roof slabs.

03:09

The one in the back is actually used as a roof garden.

03:15

One more line load.

03:17

We're going to have Fx set to

03:27

And I'm applying this load now to the one I had applied loads

03:31

to otherwise.

03:32

And so I'm adding this to all of these rafters in here.

03:37

So loads can be added, multiple loads can be added.

03:42

So you'd continue working through the model

03:43

now, adding the various loads you

03:45

need so you can get an accurate structural analysis when

03:49

you send the project to Robot or other analysis programs.

Define loads - Exercise

In this practice, you will step through the process of defining loads.

Open the project Small Medical Center – Define Loads.rvt.
To see the list of already defined load cases, select Load cases from the Analytical Model panel on the Analyze ribbon.
It will result in displaying the Structural Settings dialog box with the Load Cases tab active. The load cases may be pre-defined in the structural template or defined here. It is also possible to define/modify the name and the case number and to assign the nature from the pre-defined list.
Close the Structural Settings dialog box and select Loads from the Analytical Model panel on the Analyze ribbon.
Select Hosted Line Loads, make sure that the active load case is DL1 (1), specify the value of load Fz 1 = -0.15 ft/kip, and apply it to all rafter beams marked here.
Select Hosted Area Loads, change the active load case to LL1 (2), specify the value of load Fz 1 = -0.05 ksf, and apply it to 4 slabs marked here.
Select Hosted Line Loads, change the active load case to WIND1 (3), specify the value of load Fx 1 = 0.200 kip/ft (remember about setting Fz 1 to zero), and apply it to beams and slab edges marked here.
Change the value of load Fx 1 to 0.400 kip/ft and apply it the slab edge marked here.
Save the model with a new name.

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Defining loads

Define loads - Exercise

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