3D, 4D and 5D BIM Flashcards
Which type of information is included in 3D BIM?
Graphical (shape), Non-graphical (properties) and Documents (reports)
Which type of analysis is included in 3D BIM?
Clash Detection, Structural Analysis, Visualisations, Fabrication etc.
What is 4D BIM / Definition?
3D + Scheduling = 4D BIM
Creation of a construction programme based on experience, weather, site constraints, plant availability
What defines the quality of your 4D BIM model?
Quality of the programme and model information
Give an example of a programme used to create a schedule and a visualisation animation
MS Project, Navisworks
Benefits of 4D BIM
Most up to date information Mitigation of errors Increase efficiency Identify space and time conflicts Gives everyone a clear visual understanding of the planned works Can compare with actual progress
Limitations of 4D BIM
Quality based on programme and model information
2D section could be clearer
Thought is still required
It does not replace engineering judgement
Able to add equipment plant to represent the build
What is 5D BIM / Definition?
3D quantities + Scheduling Information + Cost information = 5D BIM
Benefits of 5D BIM?
Visually see spend over the project
Costing information is consistent
Mitigation of errors compared to manual take off
More efficient than manual take off
Quantities used in 5D BIM
Actual model component dimensions
Derived from model components that are not modelled (window mouldings)
Non-modelling quantities (temporary works)
Limitations of 5D BIM
Accuracy of cost reliant on multiple teams
Estimators still have to fill in gaps
Many elements are only modelled in 2D
Difference in models on how things are classified and the LOD
Ways to link quantity take off and costing
Direct link between BIM models and costing software
Output to Excel, create material take offs in BIM and output to a spreadsheet to produce costs here
