Building Information Modeling
BIM stands for Building Information Modeling or Building Information Management. BIM is a highly collaborative process that allows architects, engineers, real estate developers, contractors, manufacturers, and other construction professionals to plan, design and construct a structure or building within one 3D model. It can also span into the operation and management of building using data that building or structure owner have access to. This data allows governments, municipalities and property managers to make informed decisions based on information derived from the model -even after the building is constructed.
Blueprints to CAD to BIM
In the past, blueprints and drawings were used to express, information about a particular building plan. This 2D approach made it very difficult to visualize dimensions and requirements. Then came the CAD (Computer Aided Design), which helped drafters see the benefits of plan in a digital environment. Afterwards CAD turned 3D, due to which more realistic visuals to blueprints were available. Now, BIM is the standard – but it is much more than just a 3D model.
The “I” in BIM
BIM, as a whole, refers to the process of all parties involved in the construction and lifecycle management of built assets, working collaboratively and sharing data. However, the true power of BIM lives in the “I” i.e. Information. All of the information gathered – from conception to complete – isn’t just stored, it’s actionable.
The data can be used to improve accuracy, express design intent from the office to the field, improve knowledge transfer from stakeholder to stakeholder, reduce change orders and field coordination problems, and provide insight into existing buildings for renovation projects later on.
How is BIM Information Shared?
This Information in a BIM model is Shared through a mutually accessible online space known as a Common Data Environment (CDE), and the data collected is referred to as an ‘Information Model’. Information models can be used at all stages of a building’s life; from inception to operation – and even renovations and renewals.
What are BIM Levels?
- Different levels of BIM can be achieved for various types of projects. Each level represents a different set of criteria that demonstrates a particular level of ‘maturity.’
- BIM levels start with 0 and go to 4D, 5D, and even 6D BIM.
- The purpose of these levels is to gauge how effectively, or how much information is being shared and managed throughout the entire process.
Level 0 BIM: Paper - based drawings + zero collaboration
- Level 0 BIM refers to not operating collaboratively at all.
- If you are using 2D CAD and working with drawings and/or digital prints, you can say you’re at level 0.
- Most of the industry is working above this level, although not every professional in the industry has sufficient BIM training and some projects do not include the use of BIM in contract specifications.
Level 1 BIM: 2D construction drawings + some 3D modelling
- Using 3D CAD for concept work, but 2D for drafting production information and other documentation, probably means you're working Level 1 BIM.
- Many firms are at Level 1 BIM, which doesn’t involve much collaboration, and each stakeholder publishes and manages their own data.
Level 2 BIM: Teams work in their own 3D models
- Level 2 BIM begins to add in a collaborative environment.
- At level 2, all team members use D CAD model but sometimes not in the same model. However, the way in which stakeholders exchange information differentiates it from other levels.
- When firm combine this with their own data, they save time, reduce costs, and eliminates the need for rework. Since data is shared this way, the CAD software must be capable of exporting to a common file format, such as IFC (Industry Foundation Class) or COBie (Construction Operation Building Information Exchange)
Level 3 BIM: Teams work with a share 3D model
- BIM level 3 is even more collaborative, instead of each team member working in their own 3D model, Level 3 means that everyone uses a single, shared project model.
- The model exists in a central environment and can be accessed and modified by everyone. This is called Open BIM, another layer if protection is added against clashes, adding value to the project at every stage.
Benefits of Level 3 BIM are:
- Better 3D visualization of the entire project
- Easy collaboration between multiple teams and trades
- Simplified communication and understanding of design intention
- Reduced rework and revisions at every stage of the project
Level 4, 5 & 6 BIM: Adding in scheduling, cost, & sustainability information
- BIM level 4 brings a new element into the information model: TIME. This information includes scheduling data that helps outline how much time each phase of the project will take or sequencing of various components.
- Level 5 BIM adds cost estimations, budget analysis, and budget tracking to the information model. When working at this level of BIM, project owners can track and determine what costs will be incurred during the length of the project.
- Level 6 BIM information is useful for calculating the energy consumption of a building before it's built. This ensures that designers take into account more than just the upfront costs of an asset. Level 6 BIM ensures accurate predictions of energy consumption requirements and empowers stakeholders to build structures that are energy efficient and sustainable.
Benefits of Level 4, 5 & 6 BIM are:
- More efficient site planning and scheduling
- More efficient hand-offs between steps in the construction stage
- Real-time cost visualization
- Simplified cost analysis
- Reduced energy consumption in the long run
- Better operational management of the building or structure after handover
The Future of BIM
- Because of the clear benefits, BIM is here to stay.
- It has defined goals and objectives that are clearly beneficial to all those who work their way through the levels. Undoubtedly, the future of construction will be even more highly collaborative and digital. As BIM becomes increasingly more sophisticated, 4D, 5D, and even 6D BIM will start to play a part in the process.
- More and more, stakeholders are walking through BIM models using augmented and virtual reality. This application can help contractors and manufacturers with clash detection and training, architects to sell their designs, and owners to "see" into their structures and make better decisions for maintenance and retrofitting.
- Furthermore, around the globe, there is an attempt to reduce waste in construction. Much of this is attributed to supply chain inefficiencies, clashes, and reworking. By working collaboratively in a BIM environment, all of this becomes much less likely, setting the stage for a better tomorrow.