Isolated foundation analysis properties

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The isolated foundation.

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Analytical model contains a single analytical point which access

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a support when transferred to robot structure analysis professional.

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The fixity of the support can then be defined

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the isolated foundation supports can be

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automatically checked against a user defined tolerance

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that checks the structural members position

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relative to the isolated foundations support.

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When linking REV to robot, an isolated foundation becomes a robot support.

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The support is named REV

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BC fixed and by default is fixed in all six degrees of freedom.

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It's also worth noting that a RT

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boundary condition will transfer to robots and become a robot support.

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This will also be mapped at A R

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BC support type.

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You'll notice in the model that we have four simple beams supported

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by four steel columns that are each supported by isolated structural foundations.

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However,

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you'll note that the bottom two foundations

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are offset causing eccentricity within the structure.

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Let's now investigate this in the analytical model

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in the project browser. Go ahead and double click on the analytical model view

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in the analytical model.

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You'll notice that the analytical isolated foundation

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is represented by this gray point.

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You'll notice that we have support under the two columns here.

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But as we said earlier,

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you can see that the supports are offset from the columns causing eccentricity.

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We'll now get rev it to check the supports

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to do this. Go ahead and select the analyzed ribbon

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and on the analyzed ribbon, go ahead and select check member supports.

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Notice that

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it gives a warning and you can see here that in the warning dialogue box,

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it's informing us that the structured element may not be supported.

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Notice that the structured element here is highlighted,

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I can view the next warning by selecting the next warning button

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and you can see it's now highlighted this member here.

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However, in reality, these two columns are supported.

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But as we've said earlier, the foundations are eccentric.

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In this example, we'll change the tolerance that rev it's using

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to do this. Let's go ahead and select the analytical model settings.

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This is found in the analytical model tools panel

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and here we can select analytical model settings

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in the structural settings dialog box.

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You'll note here that we have an area for tolerances.

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Notice here that the support distance is currently set to 1 ft

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here. I'm going to change this and we'll now select 2 ft

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and click. OK?

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We will then get another warning informing us that

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these changes could take some time to complete.

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We'll just go ahead and select close there

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and once again, we'll go up and select check member supports

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in the warnings, dialog box.

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You'll now notice that the member support check is complete.

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No unsupported elements have been detected.

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OK.

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So now that the checks are completing rev it,

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we can now start to have a look at the interaction between rev

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and robot structural analysis professional

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on the analyze ribbon. Go ahead and select robot structure analysis

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in the pull down menu, select robot structure analysis link

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in the integration with robot structural analysis dialogue box.

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The direction of integration is going to be to send the model to robots

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and we'll use a direct integration method.

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Go ahead and select OK.

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Rev it will now send the model to robot structure analysis.

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The information dialogue box allows us to see information that may be present.

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In this case, we'll just click no.

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And you can now see we're in robot structural analysis professional.

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Let's first begin by reviewing the support.

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So if we select a support in robots, you'll now notice that it's using the R

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BC fixed type.

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And again, here we can review this by selecting support

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and in the supports dialog box. If we double click on REV

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BC fixed,

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we can now confirm that all six degrees of freedom are fixed.

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OK. Let's go ahead and click close and close again to the supports dialogue.

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Before we can analyze this structure,

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we need to create a rigid link between the support here and a common base

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to do this. We'll go ahead and set up the geometry menu.

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And then we'll go to additional attributes

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and select rigid links.

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We'll need to create a fixed rigid link to do this.

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We'll select the new rigid link tool

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and here we can type in fixed the label.

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And here I'm going to block all six directions and click add.

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We can then click close to the rigid link dialog box.

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And now we can set our master node and our slave node.

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the master node must be the support and the slave node will be the column base.

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So go ahead and select master node

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and we'll pick the node here

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and then we'll select slave node and pick the column base.

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And in this case,

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you can see that we have node three for master add node seven for the slave node,

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click apply

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and then click close.

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We'll now repeat the same process for the other support on the column base.

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So to do this, we'll go back to the geometry menu

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will go to additional attributes and select rigid links.

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And once again here we'll select master node,

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we'll select the supports

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and then pick slave node and pick the column base.

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And of course click apply

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and close.

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We're now ready to run the calculations

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on the standard toolbar. Go ahead and select calculations.

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You can now set the calculations of run without any errors or warnings

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and will now go to the layout menu

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and choose results.

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And here we'll choose results diagrams.

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Now here, we're simply just interested in the reactions at the supports.

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To view these, we'll select the reactions tab

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and we'll select the reaction in the FZ direction.

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And also the moment in the X direction

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would also view the descriptions and then click apply.

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You can now see that we have the same force

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showing in the Z direction for all four supports.

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But of course, we have a much bigger moment on these areas here with the rigid link.

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So to summarize this, we can take a simple rait

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model, transfer it across to robot,

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add some rigid links to transfer moments

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across and then get accurate analysis results.