WEBVTT

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Hello, I'm Doug Eicher, and I'd like to introduce you to the Joist

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Wizard. This tool analyzes your joist geometry and loading

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requirements to help you determine the most cost-effective joist depth for

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your project. It also helps you to estimate various properties of the joist,

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including weight, moment of inertia, and maximum allowable duct

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sizes. Let's jump in. All right, so we start off

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on the home screen of the tool, and right away you'll notice this Project

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Info tab on the right-hand side. So the first four fields of

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this are really just header information.

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They're going to be used on the report that you generate at the end.

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So they're really optional. If you want to put them in, you can, but they're not

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required. Next, you'll notice we can select our units.

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So this tool supports both metric and imperial units.

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We have our design method, and then we have our design code, which is

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just going to be used to decide which load combinations to

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run during the analysis. Then we have a Save Record button.

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If you want to come back and view your work later, you can save a record, and we'll

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talk about how to do that here in just a second.

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Moving to the rest of the inputs. Up here, this is blank

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right now, but as you're inputting information, this is going to

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populate with a parametric joist view.

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So basically, it'll show the basic geometry of the joist and all the loading that's

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applied to it in real time as you go.

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And then here under our specifications, we have some basic information about the

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joist. So we have our span, which is going to be that grid line to grid line

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dimension.

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If we have a situation where we need to limit how deep

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the joist is, we can specify depth limits, in which case it'll give you a

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minimum and maximum depth you can specify.

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We have our tributary width, which is going to be used to calculate the unit

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loading that's applied to the joist from the area loads that you input.

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And then we have our live load deflection limit.

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Next, we have our uniform loads.

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Right away you'll notice there's this toggle here.

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If I have a situation where I have some more advanced loading,

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maybe I have a concentrated load or a drift load or something along those lines, I

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can come in here and select this toggle and it'll take me to some more advanced

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input. And we'll get into that in just a minute.

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We have our basic uniform loads here, and then we also have this Add

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Self Weight option. So if you're in a situation where you don't want to have to

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include the self weight of the joist and the bridging in your dead

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load, what you can do is select this, and in the background, the tool

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will calculate that weight as it's going through the analysis and apply it to

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the joist.

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Next, we have our uplift. So by default, the tool is going to assume gross

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uplift. But if you'd like to apply net uplift, you can do that as well.

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If you select gross uplift, the tool will run the net uplift calculation

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in the background, or if you select net, then it will just take that at face

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value.

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Okay, so let's take a look at our advanced mode.

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So I can switch to that with either one of these toggles, either the one down here

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or the one in the upper right-hand corner.

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Both of them will take me to the same place.

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If I click on that, now you'll see I have a few more

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inputs. So under our specifications, now I have this

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TCXL and TCXR. So if I want the

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top chord to extend past that grid line dimension on either

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end, I can input those here.

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I have a slope input as well if I have a sloped joist, and if I'm trying to

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meet a minimum stiffness criteria, I can input a minimum moment of inertia.

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Under my uniform loads, these look pretty similar to before, but now I just have a

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few more inputs.

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One thing you'll notice up front here is this dead reliable and dead collateral.

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So the difference between these two, they're virtually the same, but the difference

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between them is if I have gross uplift input, when the

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tool runs the net uplift calculation, it will only subtract the

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dead reliable load from the uplift, and it won't subtract the

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dead collateral. So in practicality, this would probably look like for

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the weight of your roof structure would be considered dead reliable load.

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And then anything hanging maybe on the bottom chord or light

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fixtures, things like that would be considered dead collateral because it's not

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necessarily permanent and might move around.

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We also have a rain load input. Now keep in mind this tool does not do

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ponding analysis. So this rain load is just going to be applied as a

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basic uniform load. And then we have our downward wind input

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here as well.

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And then under the uplift, this is also pretty similar, but now we have the option

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for zonal uplift. So let's say you're in a situation where your joist is

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right at the transition zone between two uplift

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zones. What you can do is you can select the zonal uplift, and then

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it'll give you this option to input the magnitudes and then the start

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and lengths for each one of these different uplift zones.

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And now we get into some of the bigger pieces of this advanced mode.

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We have our distributed loads input.

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So this would be used for loads that either have a differing start and end

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magnitude, or maybe they don't span the full length of the joist.

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So I can input those here. I also have concentrated

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loads. So if I want to apply those here, I have the option to input a

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magnitude and a location. And we also have this Add Load

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option. So this would be used in a situation where, say, maybe you have a

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rooftop unit that you know is going to be applied via two point

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loads somewhere on the joist, but you don't know exactly where they're going to be.

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What you could do in that situation is you could take those two concentrated loads,

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you could sum the magnitudes, and then apply that as an add load to the

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joist. And then what would happen is when Vulcraft designs that joist,

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it will be checked for that load at every panel point.

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So that way, we know that the joist will be good regardless of where

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those loads are located along the length of the

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joist. Next, we have our axial loads.

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So if the joist is part of the lateral system,

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then we can input an axial load. You can select

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a top or bottom chord for that load to be transferred through.

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You can select a transfer method, so that's basically how the load gets into the

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joist and how it gets out. You can choose either joist seat or other.

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Just keep in mind that if you do select the joist seat, then there's some

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additional restrictions on the magnitude of load that can go through the joist

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seat.

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We can select a load type, so you can select wind or seismic, and

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then you can give a magnitude for your axial load.

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And then here at the bottom, we have our end moments.

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So if your joist is part of, say, a moment frame where your

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bottom chords are welded to your column, you can add end moments to the

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joist. So here we can specify a moment type, whether

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it's gravity or lateral. So that would be if

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your moment is being applied by your gravity loads versus by the

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lateral loads on your building.

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You can select an end for that moment, so if you want to apply it to

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the left or right end. You can select a transfer method, so either

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other or through the joist seat, and then you can select your load

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type. So just keep in mind that depending on what you

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input for the moment type over here, you will get differing

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options for your load type.

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And then lastly, you can input the magnitude for that.

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Okay, so now that we've walked through the various inputs, let's go ahead and

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let's go back to our basic mode. And just notice it'll bring up

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this little dialog that lets us know, hey, any advanced inputs that we

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gave are going to be cleared. So we'll go ahead and say yes.

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And then let's go ahead and just run a basic example.

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So we can do either metric or imperial units, but in

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this case, I'm just going to leave it at metric units.

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Let's go ahead and input a span.

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And then for our depth limits, let's go ahead and select yes.

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And you'll notice here that some values are pre-populated, and these are based

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on allowable span-to-depth ratios for the joist.

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So let's go ahead and leave our minimum depth where it's at, and let's put our max

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depth at 406 millimeters.

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For our tributary width, we'll give 1650.

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We'll leave our live load deflection limit where it is.

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And then for our uniform loads, we'll put our dead

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reliable at 0.75 kPa, and then we'll

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put our snow at 1.7 kPa. And then let's

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go ahead and enter 0.75 kPa

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for our gross uplift.

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And with that, let's run a design. Okay, so now we're here on the

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results page, and you'll notice right away that one of these is

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highlighted with this green bar, and that's just indicating that it's the most

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cost-effective option out of the different depths that it ran.

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So in this case, you can see that it ran two options,

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356 millimeters and 406 millimeters.

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And so it's just highlighting this one as the most cost-effective option.

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So starting at the left-hand side here, we have our depth in millimeters, we have

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the cost ratio,

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and then we have our self-weight. So that's going to be the weight of the joist

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plus the weight of the bridging. And there's just a little note here to make

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sure that you've included the joist self-weight in the specified dead

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load that you've provided. We have our moment of

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inertia, and there's a note here just indicating these are

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estimates for the moment of inertia.

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So if you have a minimum requirement that you need to meet, you want to make sure

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to provide that to Vulcraft so we can design the joist

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accordingly. We have our live load deflection ratio.

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Again, we have a note indicating that these calculated deflections have been

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increased by 15% to account for shear

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deformation. We have our top chord width,

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so this is going to be the total width of the top chord, so the length of both

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angle legs plus the chord gap between them.

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We have our number of bridging rows, and then we have our max duct

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sizes. So these are estimates of the maximum size ductwork

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that can fit through the plane of the joist.

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And again, these are estimates, so if you have ductwork on your

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project, you'll want to make sure that you provide the actual duct

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sizes and locations to Vulcraft, and we can make sure to design

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the joist accordingly around that ductwork.

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We can also generate a report if we want to, which we'll walk through here in just

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a second. But first off, let's go back to our input screen and let's take

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a look at our advanced mode.

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So let's say that we have slightly more complex loading

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requirements than what we had here.

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What we can do is we can click on this advanced mode, and you can go there either

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with this toggle or this one up here in the right-hand side.

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Either one will take you to the same place.

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Click on this toggle, and now you'll see we have a few

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different options to enter for our loading and our geometry

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inputs. So we'll come in here. Let's go ahead and take away

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our depth limits. So we're just going to go ahead and let it run wide open for the

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depth. We're going to leave our tributary width where it's at.

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But now we're going to go ahead and enter a top chord extension.

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So in our case, we'll enter 300 millimeters, and so now you'll see the

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diagram updating here on the left-hand side, that top chord extension.

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We'll add a slope, and then we'll leave our minimum I where it's

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at.

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For our uniform loads, let's change it up a little bit.

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We'll put in 0.3 kPa for the dead reliable,

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0.75 for that dead collateral. Again, the distinction between those two

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is one is used in the net uplift calculation, the dead reliable, versus the other is

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not.

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Let's leave our snow where we are. Let's go ahead and input a downward

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wind load of 0.75 kPa. Let's check

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add self-weight. Let's leave our uplift where it is.

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So let's go ahead and input a distributed load.

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So let's say we have a drift load. We'll select snow.

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For our starting magnitude, we'll go ahead and enter that.

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For end magnitude, we'll go to zero.

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Okay, and then we have our start location. So just something to keep in

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mind, if I were to, say, put in the length of my

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load and then go up to the diagram and leave the start location at zero, you'd

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see how this load is actually starting not at the end of the

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TCX, but right here at the grid line dimension.

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And so in this case, we'd probably actually want it to start at the very end of the

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joist. And so the way that this works in this tool is everything to the

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right of that grid line dimension is a positive number, everything to the left

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is a negative number. So in my case, if I want to shift the load back, what I

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would have to do is come down here, and for my start location, I'll enter

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-300. And so now if I go back up to the top, I'll see that

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this load has shifted to the end of the TCX where I want it to be.

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Let's go ahead and enter a concentrated load.

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We'll leave it at the dead reliable.

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And then for our load magnitude, we'll put in eight

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kilonewtons.

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For our location,

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we'll enter

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5,550 millimeters. We'll go ahead and leave the

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add load option unchecked.

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Let's add an axial load. We'll leave the other inputs where they are,

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and then let's go ahead and enter our magnitude.

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And you'll notice if we go to the top now that the diagram updates

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and we see that wind load here on the top chord, and we also see that concentrated

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load.

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And then one last thing, we're not going to worry about end moments for this case,

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but if we were to add an end moment, like say that we just put a magnitude in

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here just so we can see it. If you scroll back to the top, you'll see that that

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moment is now shown on the diagram on the end of the joist where it's

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applied. But in this case, we're not going to worry about it, so we'll just set

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this magnitude to zero.

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All right, and then just so we can see how this looks on the report, let's go

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ahead and enter some identifying header information.

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So we'll just put in a project number.

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We'll put in a project name,

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a design mark,

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an engineer, and then we'll go ahead and leave everything else where it is.

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So let's go ahead and run our analysis.

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Okay, and so now you'll see everything looks pretty similar.

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Now we have a few more depth options because we let that run wide open.

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You will notice here at the top we have this note, and that's just indicating that

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since we chose to have the tool apply the joist self weight, we'll need

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to make sure that we notify Vulcraft of what that self weight is so that

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we can apply that correctly in our design.

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One other thing, too, down here we have this equivalent uniform load section.

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So we don't actually recommend using equivalent uniform loads to specify

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the joist because there can be stress reversal issues with the joist webs in the

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center, and so it could cause the joist webs to be designed

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incorrectly. But this is just given so you have kind of a

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window into how the tool is estimating joist

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properties. So if I click here, I can see all the different load

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combinations that were run, and if I click on one of them, now I

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see the shear and moment diagrams for that particular load

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combination. And here you'll notice that we see a difference between

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the equivalent shear, which is shown by this blue line, and the actual

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shear, which is shown by this purple line here.

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And the same thing with the moment as well.

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And you'll notice that with each one of these, if I hover over it, it

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will show me the value at that particular

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location. Okay, so now let's go ahead and take a look at our

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report. If we click generate report and we select the depth we

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want and hit generate,

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it'll spin for a second, and it will generate a PDF.

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And so here we can see it just gives us a basic load diagram with

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all the load inputs that we gave, and then it will give us some basic

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project info, and then also the results that we obtained from the

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analysis.

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And then if I want to come back later, so I want to save my work and come back

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later and change things, or maybe I want a colleague to take a look at my

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work, what I can do is click this save record button, and this will

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generate a record key for me, and if I click this button, it'll copy it to the

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clipboard. And what this will do is, is if I come back to the input screen

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and say we just refresh the tool so we clear everything out.

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I can come back, I can click load project, I can drop in that

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record key and click get record. And so now you see all of those

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inputs populate in, so now I can come back and I don't have to start again

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from scratch.

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Okay, just a couple more things. We do have some additional pages.

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If you, say, have a question about the tool or about how it's analyzing

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something, you can click on this FAQ page, and in here we

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have quite a few frequently asked questions, and so if you're

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curious about something, you can click on that question and it will show you an

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answer here. And then we also have a technical revisions

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page, so if you want to follow along with how the tool is being updated, see what

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changed since the last version, you can click in here and you can see all those

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updates.

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And then lastly, we just have this licensing page, which is just for legal

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reasons, that shows the licensing for the different

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components that were used in the design of this tool.

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And that's the Joist Wizard, your go-to resource for determining the best joist

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option for your design. And with that, happy specifying.