Working with foundations Part 1

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After completing this lesson, you will be able to understand foundations, place pile caps, create wall foundations, and create foundation slabs.

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The objective domains covered are, 1.1a, work with foundations.

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A foundation connects elements to the ground and distributes load safely to the earth and rock.

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Revit has three main types of foundation elements: a wall foundation, a foundation slab, and an isolated foundation.

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Each of these elements has relationships to the structural elements that they support.

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For example, the wall foundation will follow the wall's plane shape and always attached to the bottom.

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An isolated foundation can be located at a structural column base,

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and again, will remain attached and follow the element in plan position as a way to stick into the bottom of the column.

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Go ahead and open up the model 012-Work with structural foundations Part 1.

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The model will open up in a 3D view.

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Our first task is to place some isolated foundations down on the top of foundation plan.

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So in the Project Browser, let's go ahead and open up the Top of Foundation plan.

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We'll then zoom up towards grid B2 and we'll go ahead and place our first isolated foundation.

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On the Structure ribbon, select "Isolated."

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Note on the context ribbon, we have the option of placing the foundations At Grids or At Columns.

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In the Properties palette, select the Type selector and ensure that you've selected the Pile Cap-6 Pile.

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To rotate this element, you can move over existing elements in Revit and press the "Space bar" to orientate the foundation.

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We can then place a foundation out at grid B2, and another one at B4.

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I'm then required to place some 4 pile foundations down at C2 and also at D2.

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So here we are going to utilize the At Columns tool.

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In the Properties palette, in the type selector, we will now go ahead and choose the 68x68x35 inch.

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Now we can make a selection set of our columns.

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Notice that Revit now places the foundations down at the column bases.

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We can then go ahead and select "Finish".

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Let's review our model in 3D.

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So click the 3D view and you can now see our foundations are placed.

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So note here we have our pile caps and our piles.

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Our next task is to place a retaining foundation underneath the walls on the left hand side of the model here.

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On the Structure ribbon, select "Wall".

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On the Properties palette, in the type selector, ensure that you've selected Retaining Footing.

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This is simply placed by movement over a wall, selecting the Tab key and you can place all the footings in one click.

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The footings are linked to the wall, so if we start to change the wall's geometry, the footings will update.

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Let's now take a look at the type properties of these footings.

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Selects a footing that you've just placed.

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In the Properties palette, select "Edit Type".

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You'll note here that we have a structural usage and currently it's set to Retaining.

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If I set this to bearing, you will notice that we have a simple width and foundation thickness.

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In this example, the foundation will then be centered about the wall.

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If I set this to Retaining, you can see that we can set a toe length, a heel length, as well as a foundation thickness.

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Note also here that we can actually set an end extension length as well.

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So in this case, my foundation is projecting 1 foot past the wall.

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Finally, we place a foundation slab underneath the lift pit.

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In the Project Browser, open up "-02 Lift Pit".

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And then zoom up on the lift pit walls.

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Here we're required to place a foundation slab 24 inches thick underneath these structural walls.

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On the Structure ribbon, select the "Slab" tool.

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On the Properties palette, in the type selector, we have foundation slab, 24 inch foundation slab selected.

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You'll notice on the context ribbon here, we have Boundary Line selected, and by default Pick Walls is the placement method.

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On the options bar, we currently have a 1 foot offset.

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I'm going to change this to 1 foot and 6 inches.

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And now, as I select the walls, you can see now that the boundary is created 1 foot and 6 inches from the wall.

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We can then simply click the green tick to finish the edit mode, and our foundation slab has been created.

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Once again, we can review our model in 3D.

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And here's our newly created foundation slab.