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03 | BIM Author
The “BIM author” teaches practice-oriented skills in 3D modelling. Here, knowledge in the area of Building Information Modeling (BIM) is acquired independently through hands-on exercises to create 3D models.
Module construction
The first step is to learn how to model from the architect's point of view. The model is then statically checked and adjusted. Finally, as a BIM author, we will model the TGA for our building.
Role description
Content of the module
Objectives of the module
- Knowledge of the tasks of a BIM author
- Modelling a simple building using a BIM-certified CAD tool
- Interpreting and implementing an AIA
- Interpretation and implementation of the modelling guideline and the model requirement depth (LOD, LOI, LODN)
- Create a digital delivery item as an IFC file
- Carrying out an audit using the BIM Collaboration Format (BCF)
Theory required for this module
The following theoretical components are required to complete this module.
General
In the BIM author's module, a subtask for the respective discipline must be completed. There is one task for architecture [AA], one for statics [AS] and one for building technology [AM]. The first step is to create the architectural model as a BIM author. To do this, the appropriate software (Revit or ArchiCAD), the reference plans, and the AIA must be downloaded. These can be found via the download button on this page.
The task of architecture
Based on the reference plans and the AIA, model the building in BIM-certified software, in this case Revit or ArchiCAD, and export the model as an IFC file.
Specifically, the task includes the following steps:
- Download & read AIA
- Download reference plans & building and component requirements
- Select and install software
- Create a new project
- Link reference plans and create coordination bodies
- Model start-up
- Model bullet
- Model roof
- Place rooms
- Exporting a file
- Uploading DLG to CDE
AIA
The client information requirements (AIA for short) determine when, by whom and in what quality information is delivered. For more information about AIA, click here: AIA - Client Information Requirements. The AIA for this module will be downloaded via the download button. Password: recharge downloads
Knowledge of AIA is essential for the rest of the module. Without knowing the AIA for this project, it is impossible to proceed.
Password: aufladendownloads
General
The purpose of BIM software is to improve the planning, construction and management of buildings. This is done by creating a digital twin of the real building: a 3D model that brings together all relevant construction information. Everyone involved in construction — from architects and engineers to construction managers and facility managers — works with this model, which enables seamless collaboration over the entire life cycle of the building.
However, it's important to note that not all BIM software solutions are the same. Currently, a single BIM program does not cover the entire project process, but only fulfills specific areas of responsibility. For example, architects create a 3D model of the building, engineers carry out structural planning and facility managers plan management and maintenance. Software can only be regarded as BIM software if it combines at least all relevant data on a common platform. In addition, good BIM programs work parametrically, which means that they link and relate all building components together.
BIM software for authors in the discipline of architecture [AA]
Revit
After logging in to Autodesk, Revit can be downloaded from the following link: https://www.autodesk.de/education/home
ArchiCAD
ArchiCAD can be downloaded from the following link: https://graphisoft.com/de/archicad/lizenzen/ausbildungs-lizenzen/studentenversion
Coordination body
Create a template file (Revit)
The first step is to create a template file for our software. The coordination body and origin are defined in this file.
- Place the coordination body on the coordinates [0,0,0]
- Place axis point at [20,20,0]
First steps for authors in the discipline of architecture
To start the task, the corresponding BIM-certified software is opened and a new project is created. The reference plans are then linked to the file and levels and grid lines are set on the basis of these.
Create a file and use a template (Revit)
At the beginning, a new project is created in Revit. Here we use the provided .rte template file, which can be downloaded using the download button below. The password for this is: aufladendownloads.
For more input on creating files and using templates, this can nugget be involved.
Create a file and use a template (ArchiCAD)
At the beginning, a new project is created in ArchiCAD.
For more input on creating files and using templates, this can nugget be involved.
Download and read reference plans (Revit)
Once the project has been created, the levels for our building can be adjusted. The correct heights of the levels can be derived from the task or the reference plan. The axle grid can be adjusted at the same time. The positioning of the grid can also be derived from the task or the reference plan.
Download and read reference plans (ArchiCAD)
Once the project has been created, the levels for our building can be adjusted. The correct heights of the levels can be derived from the task or the reference plan. The axle grid can be adjusted at the same time. The positioning of the grid can also be derived from the task or the reference plan.
Password: aufladendownloads
Levels (Revit)
Layers form the backbone of the model in Revit. Each element in the model is assigned to a level and positioned by linking to these layers to determine its placement in three-dimensional space. Layers are also intended to create top views of the model, which makes modeling and navigating the model easier.
Create layers and grids
1. Place layers
Before we start modeling geometry, we first place the missing planes according to the reference plans. To do this, we call up a section and can place the missing layers in the project for now.
2. Rename layers and set heights
Once the level has been placed, its height and name may need to be adjusted. You can change both parameters at any time.
3. Place grid lines
Gridlines can be placed next. These are similar to planes, but vertically and without mandatory dependency.
Create layers and grids in Revit
Create layers and grids in ArchiCAD
Modeling guidelines
This course covers the most important rules of the modeling guideline. These include:
- coordination body
- storeys
- Placement of model elements
- Multi-layered model elements
- baselines
Model start-up
1. Model the foundation
For the first step of modeling, we start with the foundation. The exact dimensions and positions of the foundation must be drawn up in accordance with the reference plans from the task. Care must be taken to select the correct components and their labeling and attribution. To learn more about the foundation function in Revit, you can use this nugget: Revit - Advanced
2. Model base plate
Once the foundation is correctly placed, the base plate including the layer of cleanliness is modelled. The exact dimensions and positions of the components must be created in accordance with the reference plans from the task. To learn more about the floor feature in Revit, this nugget can be added: Revit - Beginner
3. Model insulation
Finally, the insulation is modelled around the foundation. The exact dimensions and positions of the components must be created in accordance with the reference plans from the task. To learn more about the floor feature in Revit, this nugget can be added: Revit - Beginner
Model a foundation in Revit
Model a foundation in ArchiCAD
Create properties for classification in ArchiCAD
Startup file
Should it troubles when setting the layers and grids or when using the template file, A start file with these settings can be downloaded under the download button.
Password: aufladendownloads
LOD, LIE, LOI, LOIN
Model bullet
1. Model walls
Once the foundation has been successfully modelled, the walls can be placed on this basis. The exact dimensions and positions of the walls must be drawn up in accordance with the reference plans from the task. It is important to ensure that the walls are referenced correctly.
2. Place doors & windows
Once the walls on the ground floor have been modelled, doors and windows can be placed in them. The exact dimensions and positions of the doors and windows must be drawn up in accordance with the reference plans from the task.
3. Model the floor
Finally, the floor in the rooms is modelled. The exact dimensions and positions of the components must be created in accordance with the reference plans from the task.
Model a storey in Revit
Model a storey in ArchiCAD
Model roof
1. Model ceiling
To close the building, we first model the concrete ceiling. This is analogous to the base plate.
2. Model roof edge
In order to form the roof shape, we next model the roof edge. This is analogous to wall modelling.
3. Model insulation
In the penultimate modelling step, the roof must be insulated. The exact dimensions and slope of the insulation must be drawn up in accordance with the reference plans from the task.
4. Model attic profile
To complete the model, the attic panel is modelled along the edge of the roof. The exact dimensions and positions of the profile must be created in accordance with the reference plans from the task. To learn more about the general component function in Revit, you can use this nugget: Revit - Beginner
Model a roof in Revit
Model a roof in ArchiCAD
Place rooms
1. Place rooms
First, the room solid must be placed in enclosed spaces.
2. adjust room separation if necessary
In order to be able to read out the exact area of the room, openings for doors and windows must be manually adjusted.
3. Define room information
In the last step, the information is entered into the room stamp.
Place rooms in Revit
Place rooms in ArchiCAD
IFC
The latest version, IFC4, allows the detailed presentation of various elements in building construction, including walls, ceilings, columns, doors and windows.
IFC - Exporting
1. Export entire model
Export the entire building model as an IFC file using the export function.
2. Select IFC standard
For the architecture model, we use the IFC4 Architecture Standard. In addition, we export an IFC 2x3 for the [AS] and [AM] task. With Revit, it is important to overwrite the Pset preferences with the file, which can be downloaded using the download button below. PW recharge downloads
3. If necessary, upload IFC to the CDE
In the penultimate modelling step, the roof must be insulated. The exact dimensions and slope of the insulation must be drawn up in accordance with the reference plans from the task.
IFC - Exporting to Revit [Quix]
IFC - Importing and Configuring Psets in Revt [Quix]
IFC - Exporting to Revit
IFC - Exporting to ArchiCAD
Digital deliverables
As part of the contractor's provision of services, digital delivery items (DLG for short) must be created, checked against the requirements and handed over to the client in the required format. The delivery items, delivery times and data exchange requirements are specified by the client in an AIA, although details can be made in connection with coordination of the BIM processing plan between client and contractor. The DLGs are usually uploaded to a CDE and compiled.
Here are a few steps and considerations:
CDE
Upload digital delivery items to the CDE
ATTENTION! This step is only possible and necessary with access to the CDE. Access is available upon request from the CHARGING team.
Task for the BIM author in the discipline of structural engineer
Export the load-bearing components of project section B3, in accordance with AIA, to your design software and carry out static proofs using the design model. Ideally, use proprietary interfaces, such as Revit and Dlubal. Change the geometry of one or more load-bearing components in the design software and transfer the changes back to your specialist model structure. Then modify the properties of the specialized model structure in accordance with the AIA in the LOIN chapter. Export the technical model structure as an IFC file and save it in accordance with the file name conventions specified in the AIA (chapter 6.1.1).
Task Structural Engineer
- Open the model in Revit
- Open Dlubal in parallel
- Transfer model
- Carry out the measurement
- Transfer changes to the native model
- Add position numbers to supporting component objects
Password: recharge downloads
general
By incorporating simulation into the design process, companies can streamline their workflows. This eliminates unnecessary sequential design and analysis iterations that are common in traditional, isolated companies. With CAE, teams spend less time designing and more time developing. “[https://www.ptc.com/de/blogs/cad/what-is-cae]
BIM software for authors in the discipline of structural engineering [AS]
For our course, we use the software tools Revit 2022 and Dlubal for structural design.
Revit
After logging in to Autodesk, Revit can be downloaded from the following link: https://www.autodesk.de/education/home
Click here for detailed instructions.
Dlubal
Under the download button, you can find the click tutorial to install Dlubal or use the data center network licenses for the installation using the HRZ-Novell app on our local desktop PCs (enter Dlubal in the search field).
Password: recharge downloads
Static calculation of the structural model
Watch the videos below for the bidirectional exchange between Revit and Dlubal.
NOTE: Use Revit version 2022, as the Dlubal plug-in has not yet been adapted to Revit version 2024. The Revit 24 IFC can be imported into Revit 22 for this purpose.
You can find out more about bidirectional exchange here.
At the bottom of the page, you'll find a click tutorial with instructions on how to use RStab, if the model has already been transferred.
Transfer from native model to analysis model
1. Exporting a model from Revit
2. Create model data in Dlubal
3. Plausibility check
Idealizing the analysis model
1. Checking the knot spacing
2. Review of storage conditions
3. Review of joint formation
load combination
1. Apply dead weights and adjust gravity correctly
2. Deploy payloads
3. Create load combinations
Carry out the measurement
1. Calculate model
2. Change cross section
Transfer from analysis model to native model
1. Importing a model into Revit
Finally, the modified model is imported back into Revit.
2. Add position numbers
Add position numbers to the supporting component objects in accordance with AIA [LOIN attachment].
Tutorial for bi-directional exchange from Revit to RfEm
Tutorial for bi-directional exchange from Revit to RStab
Upload digital delivery items to the CDE
ATTENTION! This step is only possible and necessary with access to the CDE. Access is available upon request from the CHARGING team.
MEP task
Specifically, the task includes the following steps:
- Create a new project with an MEP template
- link an IFC file from [AA]
- Place drain component
- Model pipe and pipe connection
- Exporting a file
BIM software for authors in the discipline MEP [AM]
For our course, we use the Revit 2024 (or later) building technology software tool. There are a variety of software tools in this area that cannot be covered in this module.
Revit
After logging in to Autodesk, Revit can be downloaded from the following link: https://www.autodesk.de/education/home
Click here for detailed instructions.
First steps for the BIM author [AM]
The next step is to create a new file with the MEP template and link the building model. To do so, click “Next” at the bottom.
First steps for the author in the MEP discipline
To start the task, the corresponding BIM-certified software is opened and a new project is created using the MEP template. The IFC is then linked to the project from the [AA] architecture module. Using the announced model, roof drainage can be modelled.
Create a file with a template and link to IFC (Revit)
At the beginning, a new project is created in Revit. Here we use the provided .rte template file, which can be downloaded using the download button below. The password for this is: recharge downloads.
Once the file has been created, the IFC is linked. If your own is faulty or not available, it can also be downloaded via the download button.
For more input on creating files and using templates, this can nugget be involved.
Password: recharge downloads
Model drainage
1. Place the roof drain
The roof drain component is placed in the lowest part of the slope insulation at a distance of 10 cm from the attic. As a result, the pipe sticks out of the building on the long side.
2. Model pipes
From the drain, a pipe is led down the axis in the template file
3. Place connector
A connector is placed on the downpipe. The component must have the correct pipe dimensions.
4. Connect pipes to connector
All components can now be connected together
IFC - export file
1. Exporting IFC
The loaded IFC is released again and only the file is exported as an IFC 4 Reference View [Building Supply].
Model drainage and export IFC
Upload digital delivery items to the CDE
ATTENTION! This step is only possible and necessary with access to the CDE. Access is available upon request from the CHARGING team.
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