Working with structural framing Part 3

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After completing this lesson, you will be able to understand bracing,

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create a framing elevation,

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create vertical bracing,

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create horizontal bracing and understand framing properties.

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The objective domains covered are 1.1 e

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work with structural framing and connections,

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bracing members are designed to resist lateral

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loads typically from wind and seismic forces.

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Normally,

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a brace is constructed from materials such as

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steel that can resist both tension and compression.

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A brace is a specific element inside rev it with a

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unique set of properties that enables efficient modeling and setting out.

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You should not use beams to represent bracing.

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Go ahead and open up the file 010 work with structural framing part three.

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You'll notice that the model opens up in the 3d view.

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We're going to start by creating some vertical bracing in this area of the structure

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to create the vertical bracing. We first must create a framing innovation.

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The framing elevation will need to be created in a floor plan

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in our project browser. Let's go ahead and open up the 00 ground floor plan.

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Let's now zoom up on grid three

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and our framing elevation will elevate all the framing along grid three

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to create the framing elevation.

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Let's click the view ribbon

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and then pick the elevation drop down

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and select framing elevation.

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You'll now notice that when we hover over a grid line,

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the framing elevation symbol would attach itself to the grid.

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Notice as I move my mouse, either side of the grid line,

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the framing elevation would either look outside or inside the structure

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on the options bar

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attached to grid is selected.

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This is the default option and the one

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we generally want when we're creating bracing,

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I'm gonna go ahead and place down my framing elevation.

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You'll now notice in a project browser that a new folder has created innovations,

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framing innovation.

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Let's then go ahead and open up elevation one a

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you'll note that the crop region goes to the foot extents of the structure.

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I'm going to edit that so we can select the crop region

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and use the segment handle to reduce the height of our crop

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will then change the scale

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and our detail level.

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So I'm now ready to model my vertical bracing

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on the structure ribbon select price.

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You'll note on the context ribbon.

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We only have the option of drawing a straight line since this is a tension component

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in the properties paddock,

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click the type selector and just ensure that our flat bars are selected

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when we draw our first element.

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It's really important that we attach it first to the column

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and then second to the top of the beam,

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I can ensure that I'm attaching to the correct elements by keeping

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an eye on the status bar in the bottom left of rev.

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It, you'll notice. Now it says nearest to structural framing

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I can then go ahead and place this at an arbitrary position.

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The accuracy of this placement doesn't matter too much.

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At the moment,

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we'll use the properties paddock to get this into an X braced configuration.

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I'll then repeat that on the other side

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and there's my brace in placed.

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What we now need to do is use the properties

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pad and the constraints to accurately position our vertical bracing.

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Let's start with this braced member here.

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I'm going to expand the properties paddock so

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we can fully read all of the properties.

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Let's start here. So you'll note that I have a start attachment level reference.

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This is attached itself at the minute to the top of foundation.

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I'm gonna change that to ground floor

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and set my attachment elevation to zero.

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You'll now notice that the bracing starts at the ground floor level.

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The end attachment type is currently set to distance

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and here we've got roughly 7 ft from the end of the beam to this position here.

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The end attachment type is presently set to distance.

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I'm going to change this to ratio.

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The ratio will range from zero being the start of the

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beam and then one being the end of the beam.

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For example, if I type in 0.25 for the ratio.

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You can see that the brace then snaps a quarter of the way along the beam.

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In our case here, let's set this to one.

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I'll then repeat that for the brace on the other side.

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So once again, we can set this to the ground floor level,

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we can set a start attachment elevation to zero,

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change the distance to ratio

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and set the ratio in this case to zero.

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So our bracing is now complete.

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Let's switch to the 3D view

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and we can review our bracing.

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Now you will notice here that actually we

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have a clash between the two braced elements.

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I'm gonna resolve that by offsetting one of these braced elements in the Y axis.

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I'm going to select this brace here

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and not

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in our properties. We have white offset value.

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The thickness of the bracing is 3/8 of an inch. So I'm going to offset it 3/8

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right. So,

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and you can now see that this member is now in front of this member here

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using a ratio to set out. The bracing is a good idea.

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If the bay changes size, then the bracing would automatically adapt.

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Next, we create some horizontal bracing on our roof structure.

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So here on the roof,

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we're required to place some circuit hollow sections for the roof bracing

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on the structure ribbon. Let's select brace

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in the properties paddock in the type selector.

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Let's ensure that we're using our 3.5 inch round structural tube

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on the options bar. You'll note here that we have 3D snapping enabled.

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This is quite important.

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You'll notice as I now move over the frames here,

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I can snap to these frames in three dimensions.

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So my first brace is going to be attached to this beam here

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and then to this beam here.

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And I'll draw a second braced member

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across in the opposite direction.

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So again, we've got an X configuration for our bracing.

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Let's begin by setting out this braced element here.

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So when I pick this element again,

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we have the same settings in our properties paddock.

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So you note here that we have start attachment type, I'm going to set this to ratio

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and once again, I'll set the ratio to zero

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and we'll do the same over here.

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This is going to be set to a ratio

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and set that to zero.

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Now, also at this end, we also need to be at zero

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and this member's now correctly set out.

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This member here is gonna give us a bit of a

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problem because actually this beam here is in one length.

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So in order to set this out,

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I actually need to know the distance from this point here to this point here

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to measure that I'm going to open up the fifth floor plan.

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So I can now see my bracing in plan and I can also see the distance I need to measure.

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So on the quick access toolbar, I'm going to select measure between two references

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and I'm going to measure between the center of this column here

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and the intersection here of these two beams.

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If we take a look at our value here, it's approximately 25 ft two and a quarter inches.

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So if I select my brace, in this case, I'm clicking it in the plane view,

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you'll notice here that I can set this distance.

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Now, here, I can type in 25 ft and two and a quarter inches,

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right? So,

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and you can see the brace is now uh directed to the correct location.

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However, that is dependent on this end of attachment to reference,

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is that reference in the end of the beam or the start of the beam.

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So we've got to be a bit mindful about that as well.

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Now,

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something you will notice is that my symbolic

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line for my bracing is actually off axes.

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If I select both braced elements,

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you'll notice here that we have structural usage,

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I'm gonna go ahead and set this to kick a bracing

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and you'll now notice the bracings positioned down on the center lines.

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If we go into the 3d view,

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you can now see our bracings configured quite nicely in that bay.

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The last thing to do is perhaps set the Z offset value.

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So the two braces don't clash in the center of the bay

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So I'm gonna opt to uh, offset this member down and this member up.

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So the diameter of our tubing is 3.5 inches.

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So here you'll note we have our Z offset value.

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So here I could set this to 1.75 inches

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and that moves up

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and then this one here can be set to negative 1.75 inches

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and our bracing now doesn't clash.