- It is tedious and time-consuming to create separate plans, sections, elevations, details, and so forth, of the same building.
- Any change made must be manually updated in all drawings and reports.
- There is no guarantee of accuracy, consistency, or completeness.
- Coordinating work based on these drawings between the different
professionals is extremely difficult. - Conflicts and errors are detected in abundance at the construction
site, necessitating expensive fixes. - At the end of the process, the owner/operator has nothing but a
nonintelligent 2D representation of the building on which to base a
lifetime of management, operation, and maintenance.
Analysis and evaluations of energy efficiency, circulation, egress, and
other aspects of the building, haven’t really become an integral part
of the design process as the building data is not available in any
intelligent format and has to be tediously reentered into analysis
tools. As a result, the quality of the building suffers. In short, CAD
simply replicates the processes of manual drafting by reducing building representations to dumb graphic entities and does little to reduce
the inefficiency, waste, errors, and escalating costs that are all too
common in the design, construction, and operation of a building.
BIM is specific to building design
- It represents a building using intelligent objects that know about their properties and about their relationship to other objects.
- a full 3D representation of the building can be created that simulates how it would be in real life; from this information-rich model, any kind of data needed for design, analysis, visualization, documentation, construction management, operation, and so on, can be derived.
- The potential benefits of implementing BIM are manifold:
- >Because it is customized for building design, it is faster and easier to create and edit a building model in a BIM application, compared to developing the drawings of the building in a CAD application.
- Once the model is created, all other requirements, including 2D documentation, schedules, reports, 3D renderings, and animations, can be automatically derived from it, improving speed and efficiency.
- >All graphical and tabular views of the building are automatically synchronized when a change is made to the model, eliminating the inconsistencies found in construction documents created with conventional CAD software.
- Interdisciplinary collaboration can be significantly improved, as it will be based on a shared building model.
- Better support for analysis and evaluation tools will allow the building to be thoroughly and vigorously tested before it is built, instituting much higher standards of quality control than those in place today.
- Conflicts are easier to identify in the building model and can be detected during the design phase, which can reduce the expensive fixes at construction time.
- The model created during the design phase can be reused for subsequent phases such as construction and facilities management, saving costs.
- The use of a “live” model for building maintenance can reduce operating costs significantly throughout the lifetime of the building.
In general, BIM is a methodology that has the potential to integrate and dramatically streamline operations and processes in the architecture, building, and construction and facilities operations and management industries.
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