The idea put forward by Charles M. Eastman was to make a model from which all the necessary plans could be extracted, and if something changed, it would be automatically transferred to all the plans.
The solution to this problem has gained more and more space lately, as nowadays engineers are facing more and more complex challenges. With high-volume buildings, increasing energy, ergonomics, sustainability considerations, and the complexity of mechanical systems, it has become inevitable that the 1975 idea will finally become a reality. Currently, BIM technology is considered to be one of the most significant steps in terms of engineering processes, which can bring major changes to the entire construction industry.
BUILDING INFORMATION MODELING
BIM is an acronym that can be interpreted in three ways. The Building Information Model, or BIM model, is the basis of everything, a three-dimensional model loaded with information. The abbreviation Building Information Modeling is the most common interpretation, which means building information modeling. The U.S. BIM Standard contains the following definition:
“Building Information Modeling (BIM) is a digital representation of the physical and functional properties of a facility. With BIM, a common, shared source of information about the facility is created that provides a reliable basis for decision-making throughout the lifecycle; from the conception of the very first concept to its demolition. ”
Today, the letter M is much more of the word Management, which best describes the tasks of the participants, the modeling process, and the use of the BIM model. BIM is a set of CAD-based design methodology processes and guidelines that enable actors (builders, designers, constructors, operators) interested in building and operating structures to collaborate and transfer information in a real-world virtual space, and to quickly and efficiently access relevant data. display.
FROM 3D to 7D
The process of generating a BIM model is in many respects the same as the process of generating a 3D model, but is supplemented by uploading and classifying elements with reliable information content, and applying specific modeling methods and rules together.
4D shows the appearance of time in the model. The schedule is calculated from the quantities derived from the BIM model, but in the appropriate software environment it is possible to create an animation of the construction process to examine the spatial evolution of the construction.
BIM provides an opportunity for continuous cost estimation testing and budgeting. The appearance of costs is the fifth dimension in the model.
With the continuous development of software, we have the opportunity to create and optimize energy analyzes, sustainability calculations and life cycle analyzes during modeling.
The 7D BIM model includes operation and facility management.
GEOMETRY AND INFORMATION
It is customary in the profession to say that every project is different and unique. Well, this is also true for BIM. Creating a one-size-fits-all BIM model is almost impossible. Therefore, it is very important to define the end use in advance. A model with different levels of detail and information needs to be created for different uses.
LOD – Level of Development: The level of development determines the level of geometric detail of the model as well as the required information content. The LOD is a scale from 100 to 500 that defines the following levels:
LOD 100 – symbolic appearance
LOD 200 –M = 1: 200 meter scale plan
LOD 300 –M = 1: 100 meter scale plan
LOD 350 – M = 1:50 meter scale plan
LOD 400 – M = 1:25 meter scale plan
LOD 500 – Product design
By increasing the level of development, ie by increasing the level of detail of the modeling, the number of invested working hours increases exponentially, and the performance of the available IT background must be known, as detailed modeling of a larger building can require serious resources. Currently the most common LOD specification (http://bimforum.org/lod/) specifies the requirements for each element by systematizing the model elements based on the Uniformat and OmniClass classification systems.
For a more precise definition, LOD levels have been replaced by LOG – level of geometry and LOI – level of information. Thus, it was possible to define the level and quality of geometric detail of the model elements and the quantity and quality of the information content of the model elements separately for each model element.
“BIM today is different than it was yesterday and will be different than tomorrow.”
So it is constantly changing, so the range of uses is also constantly expanding. The following is a list of currently accepted applications, but the possibilities of BIM are limited only by imagination:
- Design Reviews,
- Existing Conditions Modeling,
- Site Analysis,
- Energy Analysis,
- Structural Analysis,
- Lighting Analysis,
- Other Eng. Analysis,
- 3D Coordination,
- Phase Planning (4D BIM),
- Cost Estimation (5D BIM),
- Digital Fabrication,
- Site Utilization Planning,
- 3D Control and Planning,
- Mechanical Analysis,
- Maintenance Scheduling,
- Space Management,
- Asset Management,
- Disaster Planning,
- Record Model,
- Construction System Design,
- Coda Validation.
BEP - BIM IMPLEMENTATION PLAN
Standards are always needed, especially in an area that is constantly changing and evolving. Moreover, everyone thinks differently about building information modeling, sees it differently, wants to achieve something with it or doesn’t even know exactly what it is for. So overall, an explicit, described standard makes collaboration easier for all participants.
Nowadays, the number of standards is constantly increasing, as BIM is gaining ground in more and more countries.
AEC UK CAD & BIM Standards, which is based on BS 1192. It has a comprehensive section, and Revit and Bentley users, which are very common in England, are also given separate, software-specific descriptions. From 2016, the use of BIM is mandatory for public investment in the UK.
The National BIM Standard – United States is a standard developed by the Building Smart Alliance. Version 3 is currently in use. Perhaps the longest documentation we can find as a BIM standard right now.
ÖNORM A 6241-1 and ÖNORM A 6241-2, which have been part of Austrian Standards since 2015.
There are also standards in Hong Kong, India, Australia, Canada, Finland, the Netherlands, Sweden.
There is currently no standard available in Hungary for BIM.
It is therefore worth attaching the BIM implementation plan as an annex to the contract. A BEP is a plan that sets out the goals for implementing BIM technology in a project. It describes how the constructed model will be applied, explains the implementation processes and the ways of information exchange. It also includes information on the complete project infrastructure required for successful BIM implementation, ie: the technologies used, the team responsible for implementation and the contracts to be performed.
The main content elements of the BEP are:
- project information
- project phases, milestones
- project participants
- goals and objectives
- model management (software and hardware requirements)
- quality assurance and quality control
- Frequency and content of BIM audits
- data management
- parts of work to be delivered and method of data provision (with references: presentation of the Contractor’s abilities and competencies)
- way of cooperation (description of tasks and processes)
- BIM uses
Our company can help both customers and designers to successfully implement BIM.