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Autodesk® Revit® reality check for residential construction

3

WallHeights

The levels in Autodesk® Revit® should be setup at true heights of walls. In this example we will verify the 1st floor has 9’ 1-1/8” tall walls on the first floor and 8’1-1/8” tall walls on the second floor. The floor system between the levels is a 16” iJoist as specified by the builder for design of the home. The builder has also specified a ¾” subfloor decking so we need to make sure there is a 16 ¾” floor space in the model to allow the components to fit correctly.

LevelSettings

The trades need to know the difference in levels that are used for modeling vs. levels that are true building stories. Check each level in the model for these settings in the property palette.

Roof

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5

CheckRoofLocations

The locations of the roofs should also be checked. Trussed roofs do not sit on top of walls the same way rafter roofs do. You should verify all roofs are in the correct locations by creating sections. It is wise to keep those sections in your project even if you do not use them in the documentation process just as a reference that you have checked the model for accuracy.

Door

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7

Useofyourdatain3rdpartyapplications

Once the model is checked for structural accuracy it can be exported to a format useable by trades and the software they use. In a trades work flow prior to adapting to the acceptance of BIM data the trade would have to take a set of construction documents and redraw the information they need prior to applying the trade skill set. In the workflow that includes the acceptance of BIM data the trade would start at the point of the trades skill set. For example there is no need for a truss manufacturer to draw walls because the architect has already performed this task. Another example is that there is no need for an estimator to measure walls because the measurements where placed on the wall objects when the architect modeled them.

Let’s have a look at some of the trades importing the BIM data and see the point they can start applying the expertise of their trade.

RoofTrussManufacturer

Step one; the roof truss manufacturer imports the data. Once the data is in, it needs to be checked for properties that are expected. This roof truss manufacturer would want to double-check the architect’s structural accuracy. The roof envelope and location will be verified that it is correct. The walls will be checked for structural accuracy and also that they have the correct exposure and load bearing properties. While it is pretty easy for the architect to set a wall exposure to interior or exterior, they cannot easily predict if a wall will be used to bear weight of the truss design prior to design of the trusses. The truss manufacturer should check and set the properties as needed in his software.


8

Once the data is verified and all settings are made, the work of designing and engineering roof trusses can begin. This process has been documented as cutting the time needed to complete a roof truss design in half due to the layout already being completed at the start of the job.

FloorFramingManufacturer

BIM data is imported into the floor system manufacturer software just as it was brought into the truss software. All walls and openings are imported and the wall layout is automated. Once this data is in all the floor layout technician has to do is give the data a quick check for proper settings and then begin the task of laying out the floor system.


9

WallPanelManufacturer

Wall panel software and stick framing software have the same benefits from the BIM data. They also have an additional advantage. Not only can they benefit from the architectural models data, they can also import and utilize the data exported from the roof truss manufacturer and the floor system manufacturer. With the walls and openings imported form the architectural model and the roof and floor systems in place, the tasks of doing in line framing becomes much less difficult. So does the task of applying hardware that connects roof systems to wall system, wall systems to floor systems and so on.

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11

DetailedAnchorBoltLayouts

This layout is useful for the trades that are installing the anchor bolts. This sample was created in AutoCAD® Architecture®. The framed walls and locations of anchor bolts were done using data imported from the Revit® Architectural model. This same layout could be done inside Revit® after linking the structural drawings back into Revit.

WallSnaplineLocationDrawings

This layout is useful for the framers who are either installing pre-manufactured wall panels or are building the walls on site. The framer can take this plan and pull a tape measure from the identified start locations. At each measurement location he would pop a caulk line to mark the location of where the wall or wall panel will be installed. This was created in AutoCAD Architecture® using data from the Revit® architectural model. This same layout could also be done inside Revit® after linking the structural drawings back into Revit®.


12

WallPanelLocationDrawing

This drawing is used to install wall panels. The wall panels by number and openings are noted in schedules. Openings also have rough opening values that were fed into the system by the Revit® family rough opening values that we saw in module one.

FloorFramingLayout

This drawing shows floor framing that was imported into AutoCAD® Architecture® from an engineered floor system vendor. The vendor used the BIM data form the Revit® model to populate his project with the basic geometry needed to perform the task of laying out the floor system. Once done the vendor then passed his floor framing data back and it was used to create this layout that the framer will use to identify floor beams and know the locations where they are meant to be installed.


13

RoofFramingLayouts

The roof framing layouts are needed no matter if the roof is a trussed roof or if it is a stick framed roof. Framers need these layouts to help them layout the members in the correct locations.

RoofTrussShopDrawings

The shop drawings for roof trusses are created from inside the roof truss engineering software. They are needed on the shop floors for creating the roof trusses on special tables that help position the members of the truss in a specific location prior to pressing the metal plates that permanently hold the members in place.


14

3DDWFwithLinkedBillOfMaterials

There are software packages that extract a bill of material from the models after all framing is done. This data is pushed into a spreadsheet view in a 3D DWF file along with the actual objects in the model. The data is linked to those objects. The linking is a very helpful tool when quantifying material. This deliverable can be given to an estimator so it can be verified that the list of material pumped out of the model is accurate.

3DFramingforAutodeskQuantityTakeoff®

3D DWF framing files can also be given to an estimator using Autodesk Quantity Takeoff®. This 3D framing is very helpful to an estimator where before he would have done the takeoff based on formulas tied to 3D wall lengths, now he can base his estimating on counts of items which is about 10 to 20% more accurate. At this stage the estimator can also check for structural accuracy to ensure the model was framed using the preferred methods of construction for the company.


15

Microsoft®Excel®ForBillOfMaterialsandEstimates

Information from BIM models can also be exported to file formats useable by Microsoft® Excel®. This is one of the most common tools for estimating used today. This can also be used as a platform to convert the data into a format useable by other estimating or back office purchasing software.

Usestructuraldatainarchitecturalmodels Data flowing one way from the architectural model into the truss, floor and wall manufacturer trades is very beneficial to everyone in the project. Even more beneficial is the ability to roundtrip that manufacturing data back into the BIM models. Once the framing and hardware are created, this data can be captured and sent back into the original BIM model. By exporting this data and importing that into blank structural models. In these structural models setup specifically to receive wall framing and wall hardware you can now have a wall framing model that can be inked into any Revit® model. This is useful for creating sections and even reporting bill of materials if you choose to do so from Revit®. Below are some structural models that were setup to receive data from various manufacturers.


16

ImportingwallframingandhardwareintoAutodesk®Revit®structuralmodel

Here is a model where the wall framing and hardware were imported. You can see that Revit® families of the framing and hardware were created upon import and can now be used as any other Revit® data can be used in a project.

ImportingrooftrussesintoAutodesk®Revit®structuralmodel

In this model I imported roof trusses. If you notice in all the screen shots there is a green cross. This is a useful mark to help line up all the framing should anything get out of line during the manufactures export of the data.

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18

LinkingstructuralmodelsintooneAutodesk®Revit®structuralmodel

The benefit of starting with a blank structural model is that you can link all of these into one master structural and create structural documentation.


19

LinkingstructuralmodelsintothearchitecturalAutodesk®Revit®model

Since the manufactured framing systems were imported into individual files, specific framing systems can now be linked into the architectural model. In this example, all we wanted was a section showing the roof trusses along with the typical architectural building section.

Documents

AB6105-V Autodesk® Revit® reality check for …aucache.autodesk.com/au2012/sessionsFiles/6105/951/VirtualHandout... · Revit® n: is Tool Wo vit® for arch has not be roducts mak