BIM is a process which goes far beyond switching to new software. It requires changes to the definition of traditional architectural phases and more data sharing than most architects and engineers are used to .
Associated General Contractors in US describe BIM as “an object-oriented building development tool that utilizes 5-D modeling concepts, information technology and software interoperability to design, construct and operate a building project, as well as communicate its details.”
A report prepared by US National Institute of Standards and Technology (NIST) which is about “Cost Analysis of Inadequate Interoperability in the U.S. Capital Facilities Industry”. The report concludes that inadequate interoperability is results in $15.8 Billion lost annually.
What is BIM? General Contractors or Construction Managers
Most important outcome of the STEP is EXPRESS modeling language.
EXPRESS adopts many object-oriented concepts, including multiple inheritances. Object refers to a computer language concept, which is broader than just representing physical objects. Thus objects can be used to represent conceptual or abstracted objects, materials, geometry, assemblies, processes and relations, among other things.
IFC was designed as an extensible “framework model”
I ts initial developers intended it to provide broad general definitions of objects and data from which more detailed and task-specific models could be defined
IFC has been directed to address all building information, over the whole building lifecycle, from feasibility and planning, through design (including analysis and simulation), construction, to occupancy and operation
What is IFC? B asic properties such as geometry, material, quantity, measurement, date and time, cost, actors, roles Kernel schema defines core concepts such as actor, group, process, product, relationship . The Product Extension schema defines abstract building components such as space, site, building, building element, annotation The other two Extension schemas define process and control related concepts such as task, procedure, work schedule, performance history, work approval This level comprises entity categories that are commonly used and shared between multiple building construction and facilities management applications. For ex: Shared Building Elements schema has entity definitions for a beam, column, wall, door The highest level of the IFC model contains entity definitions for concepts specific to individual domains such as architecture, structural engineering, facilities management