Introduction

Question 1

What is the definition of BIM?

Answer 1

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.

Question 2

Give 2 ways in which BIM is improving the way construction projects are completed.

Answer 2

• 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.

Question 3

What is graphical data?

Answer 3

Geometric modelling e.g. shape, volume assosiated with a component.

Question 4

What is non-graphical data?

Answer 4

Semantic modelling. It shows the type and properties of a component and its relation to others.

Question 5

What are documents?

Answer 5

Static data in the form of specs, reports, drawings etc.

Question 6

What are 3 characterists of a BIM project?

Answer 6

• Uses BIM platformsm, processes and tools.
• Parametric object modelling.
• Support for team collaboration.

Question 7

What are 3 signs that a project isn’t a BIM project?

Answer 7

• Models contain 3D data and few object attributes.
• Non-parametric modelling.
• Models don’t automatically update in all views when they change in one.

Question 8

What are the benefits of BIM to an owner/client?

Answer 8

Increased buidling performance/quality, improved collaboration using integrated project delivery.

Question 9

What are the benefits of BIM to designers?

Answer 9

Earlier and more accurate visualisations, accurate and consistent 2D drawings at any point, earlier collaboration between disciplines, improvement to energy efficiency & sustainability.

Question 10

What are the benefits of BIM during construction?

Answer 10

Quick reaction to design changes, synchronization between design and construction planning.

Question 11

What are the benefits of BIM post-construction?

Answer 11

Better management of facilities, improved handover of facility information.

Question 12

What are the 2 methods of modelling solid object in BIM?

Answer 12

B-Rep and CSG

Question 13

Describe how B-Rep is used to model solid objects.

Answer 13

B-Rep describes the surface of the object and is then infilled with a material.

Question 14

Describe how CSG is used to model solid objects.

Answer 14

CSG combines solid objects using boolean set algebra to form more complex shapes.

Question 15

Explain what a hydrid approach is for modelling solid objects.

Answer 15

A hydrid approach is where basic shapes are made using B-Rep and then can be edited by the user using CSG.

Question 16

What is a object class/family?

Answer 16

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.

Question 17

What is object-based parametric modelling?

Answer 17

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.

Question 18

What is an instance of a class?

Answer 18

An instance of a class is an object created using a class’ ‘blueprint’.

Question 19

What is a type of an object?

Answer 19

An object’s type has a specific value for a parameter in a family.

Question 20

What are generic and specific objects?

Answer 20

Generic objects are placeholders for visual expression.
Specific objects are objects that repesent a manufacturer’s specific product.

Question 21

What is LoD 100?

Answer 21

Element in a model with symbol or generic representation.

Question 22

What is LoD 200?

Answer 22

Generic objects with approximate quantities.

Question 23

What is LoD 300?

Answer 23

LoD 200 but with specific quantities instead of generic quantities.

Question 24

What is LoD 350?

Answer 24

LoD 300 but with how buildings interface with eachother.

Question 25

What is LoD 400?

Answer 25

How objects can be installed with fabrication, assembly etc.

Question 26

What is LoD 500?

Answer 26

As-built.

Question 27

What is level of information need according to ISO?

Answer 27

The specific information required for each stage in a project. This is made up of level of detail and level of information.

Question 28

What are the differences between AIA and ISO framworks?

Answer 28

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.