BIM is said to be the analogical portrayal of a physical and functional aspect of a construction project that has shared knowledge resource for information about a facility forming a reliable basis for decisions during the project lifecycle.
BIM is a process for organizing and managing all the information during the project life cycle i.e. Designing, Pre-construction, budgeting, construction execution, and operations.
In a professional language, BIM is an intelligent 3D model-based process adorns architecture, engineering and construction professionals with the insight and tools to manage, plan, design and construct buildings infrastructure to turn out the remarkable results.
Comparing BIM to CAD
There are significant differences between CAD and BIM. BIM has notably changed the way the construction society designs, documents and builds a particular building. BIM is not just a 3D CAD file; it is possible to analyze, understand and even predict the behavior of the structures via models. In other words, it’s all about the data, and the reuse of that data by a broad range of stakeholders. In short, BIM is dynamic, productive and the model gets richer over time.
Whereas in the CAD domain, it is everything about the geometric representations, but there is not enough exact information that can be used in the long-term information of the building. In comparison with BIM, the CAD environment is likely to be static. Once delivered, the 2D models are frequently rolled up and stored, while the model can be used daily.
Evolution of BIM
Before we get started with BIM and its implementation, let’s review where we stand with regards to the development of BIM. In the past, the 2D designs and the construction drawings are formed manually. In the course of time, the tech-savvy design firms discarded the hand-drawn designs, and 2D computer aided design (CAD) came into existence which gave way to the tools that could create 3D dimensional views of a design and more cutting-edge tools allows the architects to design directly in three dimensions using the virtual models.
The pre-BIM situation
- The use of 2D drawings seems time-consuming, tedious and error-prone;
- Limitations to look at the relationships between the systems;
- Significant question of interoperability;
- Very small adherence between the various trades; and
- Annotations on the drawings that needs interpretation.
The current scenario
- The owners are integrating BIM in their contract documents;
- Projects are requiring models that can be evaluated for a range of project behaviours including life-cycle costs, energy consumption, spatial validation, etc.;
- On-site BIM rooms are using the projection systems as well as running virtual meetings;
- The expertise in the entire construction world is building up in rapid speed which results in better models;
- The accuracy of models is at par, demonstrated by on-site professional;
- Using BIM, development of multiple models to explore design and construction is easy;
- Vendors have been working on the development of 3D building material archives to facilitate the BIM usage; and
- Automatic code checking is feasible.
- Facility management via the Internet;
- The Augmented Reality( capable of being in the model while on the construction site;
- Paperless workflow for the entire design, build and performance life cycle.
Benefits of BIM
- Improve collaboration amongst the team;
- Simulation and Visualization;
- Clash Detection;
- Saves money by reducing labor cost on rework and increased productivity;
- Eliminates duplication.