Transcript Corporate Template

More on Categories, Families,
Types, and Instances
Domain Knowledge in BIM
Slides are made based on Autodesk BIM Curriculum, Greenwold, S., and D. Driver. (2007). Building Information
Modeling with Revit Architecture: Lecture Notes, Autodesk, Inc. with additional content created by Wei Yan, Texas A&M
University.
Review: Categories, Families, Types, and
Instances
Categories: All objects in the building model are assigned a category.
All doors in a project belong to the category Doors. This broad
category is further broken down into families.
Families: Families are groupings of like geometry. Continuing with the
door example, a single flush door belongs to a different family than a
double door with glass in it because the geometry of the two types of
doors is different.
Types: All design objects have a type. (A type is the same as a class.)
The type defines what properties an object has, how it interacts with
other objects, and how it draws itself into each different kind of
representation.
Instances: An instance is simply a single object of a type in the
building model.
Wall:
Working with Revit Elements and Families
Families

Families are groups of similar elements.

A family integrates elements that have the same parameters,
identical use, and similar graphical representation.

Every family can contain multiple types.
1.
Double glass door
2.
Overhead-sectional
glass door
3.
Single-flush vision
door
4.
Single-flush door
© 2007 Autodesk
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Working with Revit Elements and Families
Families

Families are groups of similar elements.

A family integrates elements that have the same parameters,
identical use, and similar graphical representation.

Every family can contain multiple types.
1.
Double glass door
2.
Overhead-sectional
glass door
3.
Single-flush vision
door
4.
Single-flush door
A door can easily be swapped for a different kind of door because they
are in the same category. You cannot make a wall and then change it
into a window because they are in different categories.
Working with Revit Elements and Families
Family Types

Component family: A family you can
load into your project or create by using
templates. Reuse of family.

In-place family: A special type of
component family specific to the project in
which it is created and edited. Contains
only a single type. No need reuse.

System family: A family that is
predefined by the software. System
families can be transferred between
projects.
© 2007 Autodesk
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More on System Families
“If you can’t create the wall or roof you want with the explicit Wall or Roof
tool, you can create your own custom-shaped walls or roofs using the Model
in Place tool. This tool lets you make a 3D solid geometry of the wall that you
can then assign to the Wall category and that will behave and schedule as a
regular wall.
System families are also used for many annotation categories, such as
sections, elevations, levels, grids, text, and dimensions—they aren’t limited
to model elements.
Another characteristic of system families is that you can’t save them outside
of your project to a shared library as a standalone component. Even so, it’s
still possible to reuse system families in other projects. To transfer system
families between projects, go to the Manage tab, and from the Project
Settings tab, choose Transfer Project Standards …”
– Source: Mastering Revit Architecture 2010, by Greg Demchak, Tatjana Dzambazova, and Eddy Krygiel
Revit->Manage->Transfer Project Standards… for two projects.
Note that only non-in-place types can show in the list of types and
can be transferred. Try Revit->Home->Component->Model in Place>Wall…
In Place Walls
http://revitclinic.typepad.com/my_weblog/2009/04/in
place-family-walls.html
Working with Revit Elements and Families
Example of Families
Family/System Family
Walls: Basic Wall
Type
Exterior - Brick on CMU (Concrete
Masonry Unit)
Instance
Actual user-drawn wall in a project
© 2007 Autodesk
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Working with Revit Elements and Families
Guidelines

Familiarize yourself with the default content libraries in the
software.

When you modify a Revit element, save the family back to the
library folder.

Avoid clicking the elements in a view so that you do not modify any
element accidentally.

Move the cursor over an element to determine its family and type.
© 2007 Autodesk
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Review
Families
You can define the parameters for system families. You can also
load and create system families as separate files.
 True
 False
© 2007 Autodesk
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Review
Families
You can define the parameters for system families. You can also
load and create system families as separate files.
 True
 False
© 2007 Autodesk
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Review
Family Types
In a project, you have created families for doors, windows,
tables, and walls. You group different elements either under one
family or different families. Which of the following options are
correctly grouped?
 Mahogany wood tables and Oak wood tables under different
families
 Chairs of different sizes under one family
 Walls and their dimensions under different families
 Sliding windows and fixed windows under different families
 Windows under one family with fixed and sliding as different
types
© 2007 Autodesk
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Review
Family Types
In a project, you have created families for doors, windows,
tables, and walls. You group different elements either under one
family or different families. Which of the following options are
correctly grouped?
 Mahogany wood tables and Oak wood tables under different
families
 Chairs of different sizes under one family
 Walls and their dimensions under different families
 Sliding windows and fixed windows under different families
 Windows under one family with fixed and sliding as different
types
© 2007 Autodesk
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Review
Guidelines
To make a new family type available across projects, you should
save the family back to the library folder.
 True
 False
© 2007 Autodesk
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Review
Guidelines
To make a new family type available across projects, you should
save the family back to the library folder.
 True
 False
© 2007 Autodesk
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Questions?
Question:
How does Revit know that an element is a wall or a door, when both
elements are of the same shape (e.g. rectangle)?
Specify What, Then Where
Workflow in BIM design proceeds as follows:
1. Specify what type of object you are about to place into the model.
2. Specify all the necessary information about it so that it can be placed
properly.
What that information is depends in large part on what kind of object
you are placing. For a wall you must at least specify its start and end
points. You will also have chosen ahead of time what kind of wall it is
(partition, exterior, and so forth) and its height, but you can
change these later. This way there is no ambiguity.
Question:
How does Revit know that an element is a wall or a door, when both
elements are of the same shape (e.g. rectangle)?
Specify What, Then Where
Workflow in BIM design proceeds as follows:
1. Specify what type of object you are about to place into the model.
2. Specify all the necessary information about it so that it can be placed
properly.
What that information is depends in large part on what kind of object
you are placing. For a wall you must at least specify its start and end
points. You will also have chosen ahead of time what kind of wall it is
(partition, exterior, and so forth) and its height, but you can
change these later. This way there is no ambiguity.
Autodesk BIM Curriculum, Greenwold, S., and D. Driver. (2007)
Building Information Modeling
Families and Domain
Knowledge
Image courtesy of:
Ryder Architecture Limited
Example - Compound and Vertically
Compound Walls
Compound Walls
Compound walls are composed of multiple layers that provide space
for structural components, underlayment, insulation, air space,
membranes or moisture barriers, and finish surfaces.
© 2007 Autodesk
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Working with Compound and Vertically
Compound Walls
Materials Used in Compound Walls

You can assign a different material to each layer in a compound
wall.

You distinguish materials assigned to different layers by fill patterns
that follow certain recognized graphic standards.
© 2007 Autodesk
1.
3/8” Gypsum board
2.
3 5/8” Metal stud
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Working with Compound and Vertically
Compound Walls
Functions of Compound Wall Layers
Layer functions follow an order of precedence. A priority 1 layer has
the highest priority and can pass through low priority layers before it is
joined.
Structure (priority 1)
Supports the remainder of the wall, floor, or roof.
Substrate (priority 2) Consists of materials such as plywood or gypsum
board, which act as a foundation for another layer
made of the same material.
Thermal/Air Layer
(priority 3)
Provides insulation and prevents air penetration.
Membrane Layer
Prevents water vapor penetration. The membrane
layer should have zero thickness. It doesn’t need a
priority.
Finish 1 (priority 4)
Used as the exterior layer.
Finish 2 (priority 5)
Used as the interior layer.
© 2007 Autodesk
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Domain Knowledge in BIM Tools
The walls are almost configured properly. However, the horizontal
insulation must be moved inside of the core in order to cut through
the air space that shares it’s same priority level. Remember,
insulation and air space share the same function
(http://www.marathondrafting.com/?p=43
http://wikihelp.autodesk.com/Revit/enu/2012/Help/Revit_User's_Guide/2654-Tools_an2654/2908Compound2908/2911-Applying2911)
Assumption here: insulation should cut through air space. Making it into
Core (horizontal), this cut-through will happen automatically in Revit.
Another way to do this is to lower air space priority to 4, but it breaks the
rule of the same function layers have the same priority.
Core means core boundaries.