Brief over of Revit and Revit Families

Revit can be termed as a Building Information Modeling (BIM) software. Revit contains a commanding parametric 3D modeling database motivated program which facilitate BIM to happen. Revit empowers users to design with 2D drafting elements.

The database incudes information about a project at different building life cycle phases from concept to construction to decommissioning. This may be called 4D CAD where time is the fourth dimension.

How Revit Works :-
Revit utilize .RVT files for accumulating BIM models. A building is constructed with 3D objects to generate walls, floors, roofs, structure, windows, doors and other objects as required. These parametric 3D building objects (windows or doors) or 2D drafting objects (surface patterns) are recognized as "families" and are saved in .RFA files, and imported into the RVT database.

A Revit model contains a single database file characterized with plans, sections, elevations, legends, and schedules. If any alteration occurred in one representation of the model (a plan) are circulated to other representation of the model (elevation) as alteration to each representation of the database model is provided to one central model. As a result, Revit drawings and schedules are constantly coordinated concerning the building objects exposed in drawings.

Revit can carry out conflict detection when different components of the building are taking up the same physical space. Like many BIM-software, Revit is compatible with open XML-based IFC standard which facilitates a general contractor to involve BIM-based workflow from the diverse discipline consultants of a building project.

Modeling with Revit :-
Revit includes a work environment that lets users to extrude, revolve, trace the path of, or morph shapes drawn on a 2D plane so as to create them into 3D objects, along with perform these actions already made solid objects to cut or reorganize them.

The users are able to generate realistic and precise models of objects, as well as import premade models from other programs. The reproductive components of an object are retained to be parametrically controlled.

Revit Families :-
Revit families are the pre- made reusable objects contained within a Revit model. These objects are compiled with different parameters & parallel visual graphical representation with engineering exactness related to an entire class or group (Generic). Revit families are made with dimensions controlled by parameters (parametric) facilitating users to revise the component by altering predefined values such as height and width. Revit families generate schedules & establish LEED ratings, lessen building costs & denote products directly in your model. Revit family consist of content in 3D & 2D Revit, 3D dwg & 3ds Max file formats.

System families
It includes categories like walls, roofs, ceiling, stairs, railings, ramps, mullions, curtain panels and topography surfaces. Some predefined types are utilzed to form these families associated with each project. These families also contain creation methods specific to the type of family. The user will be able to generate new types of system families by replicating accessible types and editing their parameters.

Standard families
These families will be formed outside of the project environment by means of the family editor. They are accumulated in an external library & will be loaded into a project for utilizing with any point. Every standard family refer to a specific Revit category so that when it’s loaded into a project, to approves the graphic rules defined for its category in the object styles dialog while loaded into a project. This will keep uniformity of graphic all through the project.

This also guarantees that when you schedule a category you will get all elements that belong to that category. Standard families have their own file format extension (.rfa) and can be stored outside the project environment for later use in other projects.

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How project stakeholders can apply BIM in their work process

BIM can be applied as a work process and means of communicating with one another in the project delivery method to illustrate the end product (the model itself).

BIM generated a virtual process that covers all characteristics, disciplines, and systems of a building inside a single, virtual model facilitating all project stakeholders to work together more precisely and competently. Thus BIM creates a collaborative design process.

After the creation of the model, team members are continuously clarifying and regulating their portions in accordance with owner preferences, system's adaptability and design intention to maintain the accuracy of the model before the commencement of the actual project. If any modification is made by the project team members, it affects the entire model, creating continuous communication

After that the model itself is utilized to exchange information for design concepts to the owner. The model is also applied for estimating materials take-off for cost estimation and for conflict detection to electronically verify the proper designing of the building system. BIM can trim downs change orders by making changes electronically rather than on the job site which can get a huge saving in time and money for project schedule and budget.

Design information from all disciplines as for example from architectural designs and specifications to structural and mechanical systems information such as HVAC Ducting, piping and structural slabs, columns and shear walls are provided in the BIM database. The database includes and combines all elements of a finished building to one main database of linked project information. If any, the BIM database would mechanically rearrange all connected elements implanted in the interrelated database to communicate with any changes occurred with one element of the design.  A BIM database can surpass it’s 3D modeling capability and perform for 4-D (construction scheduling) and even 5-D (cost flow analysis). The database could significantly lessen waste in construction as well as time delays raised  by RFIs and change orders. 

BIM has also shifted time spent in various phases of design, placing more emphasis in the initial design phases and less in the construction documentation phase. Whereas with traditional CAD processes the bulk of the time was spent preparing construction documents, BIM requires more time up front, fully develop the design and model. When a BIM project goes into construction documentation, all that’s left to do is decide where to cut sections through the building and print the documents.

BIM can flawlessly gather in and incorporate the input and flow of information among design and construction professionals to make the entire process more efficient and reduce delays and cost overruns.

BIM can characterize a design as objects in the form of indistinct and undefined, generic or product-specific, solid shapes or void-space oriented (like the shape of a room), which contains their geometry, relations and attributes. The geometry possibly will be 2D or 3D. The objects may be conceptual and are constructed detailed. A building model is described by compiling together these objects. If an object is modified or moved, BIM tool then starts to dig out diverse views from a building model for drawing production and other application. These diverse views are mechanically constant i.e. the objects are all of a constant size, location, specification. Drawing uniformity reduces many inaccuracies as each object instance is defined only once.

Modern BIM technology identifies objects parametrically. Here the objects are identified as parameters and relations to other objects, in order that if a correlated object is modified, this one will also. Parametric objects mechanically reconstruct themselves in relation to the rules implanted in them. The rules are uncomplicated, involving a window to be wholly within a wall, and moving the window to the wall, or complex defining size ranges, and detailing, such as the physical connection between a steel beam and column. 

Posted by Rajib Dey

Business Development

rajib@jobs2india.com

Global Associates (Pioneer Company in 3D modeling with BIM & Sketchup)

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