“A building Information Model (BIM) is a digital representation of physical & functional characteristics of a facility. As such it serves as a shared knowledge resource for information about a facility, forming a reliable basis for decisions during its life-cycle from inception onward.” Source: United States National BIM Standard, VI 2008.
Building information modelling isn’t only a 3D drawing, but a rich data model. Creating it involves designing & assembling components accurately. The BIM images don’t only have shape & color, but also material, weight, cost, manufacturer details & heat conduction properties. Generating it enables an organisation to virtually build the building as it would be constructed on-site before the actual construction has started.
Clash & Constructability Analysis
Clash detection is an important part of the BIM modelling process. In BIM modelling, there is not just one model, but several, that are, integrated into a master model. Each discipline: structural engineering, MEP engineering etc creates a model, independently of all the others, based on the architect’s original model, which is the starting point. After each discipline has finished their model, the next step is clash detection, which is the process of finding where the models “clash”: elements of separate models occupying the same space, or with parameters that are incompatible, or in 4D BIM modeling, a time sequence that is out of order. Finding these clashes are vital, as they would severely impact the construction process, causing delays, design changes, materials costs and budget overruns.