Creating Load Combinations

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MARTHA HOLLOWELL: Developing the Analytical Model in Revit--

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Creating Load Combinations.

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In this video, we'll step through the process

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of defining load combinations of various types

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that can be then exported to Robot

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or other structural analysis programs.

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Were working in the Small Medical Center Project,

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and we want to start the Load Combinations command.

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In the Analyze tab, we click Load Combinations.

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This opens the Structural Settings dialog box with Load

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Combinations tab available.

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To add the load combinations, we just click on the Add button

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and then type in a name.

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We're going to use these as the ultimate combination.

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So ULS 1-- we're going to change the state to Ultimate.

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And then, to define the formula, we go down to the bottom,

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and where it says Edit Selected Formula,

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and we add in our factor and set the case or combination.

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Let's add another one, ULS 2.

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And this one is going to be a combination of more than one.

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We'll change the state to Ultimate

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and then add our various factors.

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So 1.2 and a dead load, and then we'll add another one.

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And this one's going to be a 1.6.

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And we're going to set that to be a live load.

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We can continue to add.

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In this case, I'm going to do a factor of 0.5

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in the case of snow.

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So let's add another one in--

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ULS 3.

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We're going to continue to make this the ultimate state.

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And then we're going to add in our various factors--

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and a snow load of 0.5.

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I can continue working through the process

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of adding these various load combinations as I need to.

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And here's an example of several other load combinations.

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Let's add one more.

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This one, we're going to have a serviceability state.

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So we'll name it SLS.

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And then, we're going to come down and edit our selected

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formula and add the various parts of the formula

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that we need--

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live load, wind load, and snow load.

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And then, we can modify the factors if needed.

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So this is a process of how you would define the load

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combinations of various types, how you would edit them

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if you need to, and then they can

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be exported to Robot or other structural analysis programs.