BIM Definition, Software Tools & Benefits

1) Preconstruction benefits to Owners

2) BIM Design Benefits

• Earlier and More Accurate Visualizations of a Design:The 3D model generated by the BIM software is designed directly rather than being generated from multiple 2D views.
• Automatic Low-Level Corrections When Changes Are Made to Design: If the objects used in the design are controlled by parametric rules that ensure proper alignment, then the 3D model will be free of geometry, alignment, and spatial coordination errors.
• Generation of Accurate and Consistent 2D Drawings at Any Stage of the Design: Accurate and consistent drawings can be extracted for any set of objects or specified view of the project. This significantly reduces the amount of time and number of errors associated with generating construction drawings for all design disciplines.
• Earlier Collaboration of Multiple Design Disciplines: BIM technology facilitates simultaneous work by multiple design disciplines. It gives earlier insight into design problems and presents opportunities for a design to be continuously improved.
• Extraction of Cost Estimates during the Design Stage: At any stage of the design, BIM technology can extract an accurate bill of quantities and spaces that can be used for cost estimation.

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• Improvement of Energy Efficiency and Sustainability: Linking the building model to energy analysis tools allows evaluation of energy use during the early design phases.

3) BIM Construction and Fabrication Benefits

• Use of Design Model as Basis for Fabricated Components : If the design model is transferred to a BIM fabrication tool and detailed to the level of fabrication objects (shop model), it will contain an accurate representation of the building objects for fabrication and construction.
• Quick Reaction to Design Changes : The impact of a suggested design change can be entered into the building model and changes to the other objects in the design will automatically update.
• Discovery of Design Errors and Omissions before Construction : Because the virtual 3D building model is the source for all 2D and 3D drawings, design errors caused by inconsistent 2D drawings are eliminated. In addition, because models from all disciplines can be brought together and compared, multisystem interfaces are easily checked both systematically (for hard and clearance clashes) and visually (for other kinds of errors). Conflicts and constructability problems are identified before they are detected in the field. Coordination among participating designers and contractors is enhanced and errors of omission are significantly reduced.
• Synchronization of Design and Construction Planning : Construction planning using 4D CAD requires linking a construction plan to the 3D objects in a design, so that it is possible to simulate the construction process and show what the building and site would look like at any point in time. This graphic simulation provides considerable insight into how the building will be constructed day-by-day and reveals sources of potential problems and opportunities for possible improvements (site, crew and equipment, space conflicts, safety problems, and so forth).

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• Better Implementation of Lean Construction Techniques : BIM provides an accurate model of the design and the material resources required for each segment of the work, it provides the basis for improved planning and scheduling of subcontractors and helps to ensure just-in-time arrival of people, equipment, and materials.
• Synchronization of Procurement with Design and Construction : The complete building model provides accurate quantities for all (or most, depending upon the level of 3D modeling) of the materials and objects contained within a design. These quantities, specifications, and properties can be used to procure materials from product vendors and subcontractors.

4) Post BIM Construction Benefits

• Improved Commissioning and Handover of Facility Information : During the construction process the general contractor and MEP contractors collect information about installed materials and maintenance information for the systems in the building. This information can be linked to the object in the building model and thus be available for handover to the owner for use in their facility management systems.
• Better Management and Operation of Facilities : The building model provides a source of information (graphics and specifications) for all systems used in a building. This information can be used to check that all systems work properly after the building is completed.
• Integration with Facility Operation and Management Systems : A building model that has been updated with all changes made during construction provides an accurate source of information about the as-built spaces and systems and provides a useful starting point for managing and operating the building.

BIM Handbook a Guide to Building Information Modeling for Owners, Manager, Designer, Engineers, and Contractors by Chuck Eastman, Paul Teicholz, Rafael Sacks, Kathleen Liston