Foundation slab analysis properties

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Analytical model is represented with a planar panel

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and is very similar to the structural flaw.

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A foundation slab does not require any support

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as it's expected to be supported on grade.

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When linking rev to robot, a foundation slab becomes a robot floor,

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the robot floor will have the same name of

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material properties as the foundation slab in rev.

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Although the foundation slab does not require a support in rev

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when transferred to robot, the floor will need a suitable support.

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The foundation slab has an area boundary condition applied that is fixed

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in the X and Y direction but released in the Z direction.

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When transferred to robot,

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we can define the elastic support coefficient in the KZ direction which

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describes the soil resistance that the slab will be sitting on.

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We're going to inspect the analytical model of our structural foundation slab.

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We'll add a boundary condition to restrain the slab in the X and Y plane

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and then we'll transfer the model to robot

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and perform an analysis on the foundation slab.

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Let's begin by inspecting the analytical model in rev

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it in the project browser under 3d views.

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Let's double click on the analytical model to open it.

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Here, we can see the structural foundation slab represented by this green panel.

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Here,

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we also have the wall represented by this blue panel and some column positions.

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When this model is transferred to robot,

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the structural foundation slab will become a flaw.

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In order to analyze this in robot,

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we're going to define an elastic support coefficient in a KZ direction,

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which will describe the soil resistance.

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This will partially support the slab in the Z direction,

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but it won't support the slab in the X and Y plane.

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So we're first going to add a boundary condition to give us support in the X and Y plane

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to do this. Let's go ahead and select the analyze ribbon

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and on the analyze ribbon, we'll select boundary condition

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on the context ribbon.

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You can see here that we have three boundary conditions that we can apply. In

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this example, we're going to apply an area boundary condition

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in the property's palate.

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You'll note here that the state of our

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boundary condition is currently set to pinned.

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In actual fact, you'll note here that the Xynz translations are all fixed.

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Let's change this to user

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and we want this to remain fixed in the X and Y, but we want to release it in the Z.

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We can then apply the boundary condition to our analytical model.

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Let's go ahead and select the edge of our analytical foundation slab.

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You can now see the boundary condition is applied.

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OK.

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So we're now ready to transfer this to robots before we do this,

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we'll release the boundary condition command

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by selecting modifier on the context ribbon

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on the analyze ribbon. We'll go ahead and select robot structure analysis

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and select robot structure analysis link

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in the integration with robot structure analysis dialogue box.

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We're going to send the model to robot

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and we're going to use direct integration.

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Go ahead and select OK.

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This will just take a few seconds to export a robot.

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Now that the model is transferred to robot back in rev,

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we have the option of seeing an events report.

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In this example, we'll select no.

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So here we are in robots.

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Let's begin by inspecting our floor.

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We'll select the floor

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and in the object inspector in the properties panel,

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you can see here that the structural object is indeed a floor.

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We'll notice that the thickness has adopted the

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same name as our foundation slab in rev.

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So this is a 12 inch foundation slab.

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And again, here we can see the materials transferred from rev it.

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So this is concrete normal weight for K si

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let's now take a look at the thickness in more detail to see this.

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Let's go ahead and select thickness

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in the fe thickness dialog box. Let's double click on 12 inch foundation slab

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in the new thickness dialog box.

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Once again,

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you can see the label which is confirming that

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we're working on our 12 inch foundation slab,

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which is the concrete normal weight for K si But what

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we need to do here is set our elastic support coefficient

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to do this. We'll select the check box here

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and we'll select parameters of foundation elasticity

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here. We can now set our coefficient. This is going to be 3600.

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We'll select add,

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we'll click, add again,

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we'll say yes to modify.

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We can then close down the new thickness dialog

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box and apply the fe thickness and click close.

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We're now ready to perform our analysis on the standard tool bar.

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Go ahead and select calculations.

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This will just take a few seconds.

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You can now see the calculations have been performed with no warnings or errors.

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You'll also notice on screen that robot is displaying all of the supports.

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We're going to turn these off for clarity

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to do this. We'll right mouse click, we'll go to display

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and in the display dialog box, let's uncheck supports.

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We can then click, OK.

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And that tidies up our model. Let's now review the results to do this.

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We'll go to the standard toolbar and select the layouts. Pull down.

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We'll go to results

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and we'll select result maps

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in the maps dialog box. Let's take a look at the moments in the X direction

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and then we'll select apply.

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We can now clearly see our moments on the slab.

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Let's also inspect these in the Y

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axis

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and click, apply

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and finally, we'll change the display of the results

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in the maps dialog box. Let's go across to scale

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and for the scale, let's set this to 256 colors.

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We then click apply

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and we can now clearly see those moments on our floor.

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OK. So in summary, we've taken our structural foundation slab from rev,

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we've added a boundary condition in rev

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to restrain the slab in the X and Y plane.

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We've then transferred that to robot.

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That structural foundation slab has then become a flaw in robot,

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the material and the thickness were also transferred across.

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And then in robot,

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we've defined an elastic support coefficient and then run the calculations.