Introduction Flashcards
What is the definition of BIM?
The use of a shared digital representation of a built asset to facilitate design, construction and operation processes to from a reliabale basis for decisions.
Give 2 ways in which BIM is improving the way construction projects are completed.
- Information is combined from various parts of a project to avoid losing information between stages which reduces errors and costs.
- Data is avaliable earlier meaning that design changes occur earlier and reduces their impact on cost and effort required to make them.
What is graphical data?
Geometric modelling e.g. shape, volume assosiated with a component.
What is non-graphical data?
Semantic modelling. It shows the type and properties of a component and its relation to others.
What are documents?
Static data in the form of specs, reports, drawings etc.
What are 3 characterists of a BIM project?
- Uses BIM platformsm, processes and tools.
- Parametric object modelling.
- Support for team collaboration.
What are 3 signs that a project isn’t a BIM project?
- Models contain 3D data and few object attributes.
- Non-parametric modelling.
- Models don’t automatically update in all views when they change in one.
What are the benefits of BIM to an owner/client?
Increased buidling performance/quality, improved collaboration using integrated project delivery.
What are the benefits of BIM to designers?
Earlier and more accurate visualisations, accurate and consistent 2D drawings at any point, earlier collaboration between disciplines, improvement to energy efficiency & sustainability.
What are the benefits of BIM during construction?
Quick reaction to design changes, synchronization between design and construction planning.
What are the benefits of BIM post-construction?
Better management of facilities, improved handover of facility information.
What are the 2 methods of modelling solid object in BIM?
B-Rep and CSG
Describe how B-Rep is used to model solid objects.
B-Rep describes the surface of the object and is then infilled with a material.
Describe how CSG is used to model solid objects.
CSG combines solid objects using boolean set algebra to form more complex shapes.
Explain what a hydrid approach is for modelling solid objects.
A hydrid approach is where basic shapes are made using B-Rep and then can be edited by the user using CSG.
What is a object class/family?
A collection of things that exhibit the same characteristics and behaviour. A deisgner describes them by a set of parameters and how the parameters relate to eachother.
What is object-based parametric modelling?
Object-based parametric modelling is the creation of a model based on a series of object classes that can be altered and it will update automatically in all instances in the project.
What is an instance of a class?
An instance of a class is an object created using a class’ ‘blueprint’.
What is a type of an object?
An object’s type has a specific value for a parameter in a family.
What are generic and specific objects?
Generic objects are placeholders for visual expression.
Specific objects are objects that repesent a manufacturer’s specific product.
What is LoD 100?
Element in a model with symbol or generic representation.
What is LoD 200?
Generic objects with approximate quantities.
What is LoD 300?
LoD 200 but with specific quantities instead of generic quantities.
What is LoD 350?
LoD 300 but with how buildings interface with eachother.
What is LoD 400?
How objects can be installed with fabrication, assembly etc.
What is LoD 500?
As-built.
What is level of information need according to ISO?
The specific information required for each stage in a project. This is made up of level of detail and level of information.
What are the differences between AIA and ISO framworks?
AIA is more rigid and gives definitive set of guidance for each level but has no link between project stage and LoD.
ISO has a good link between the level of information need and stage of a project.
