טכניון מכון טכנולוגי לישראל
הטכניון מכון טכנולוגי לישראל - בית הספר ללימודי מוסמכים  
M.Sc Thesis
M.Sc StudentKaner Israel
SubjectInteroperability and Building Information Model Exchange
between Architects and Engineers for Precast
Facades
DepartmentDepartment of Civil and Environmental Engineering
Supervisor Professor Rafael Sacks
Full Thesis text - in Hebrew Full thesis text - Hebrew Version


Abstract

After almost three decades of research and development, integrated three-dimensional parametric modeling is being adopted as the base information technology for construction by major architectural and engineering firms all over the world. The technology facilitates the compilation of a virtual digital building that contains a clear and unambiguous geometric description of the architectural design intent, guarantees that all documents, including drawings, are consistent and eliminates most spatial conflicts. These new systems are called Building Information Modeling (BIM).  

However, despite the development of Industry Foundation Classes, effective communication of models between BIM tools is still not possible. Exchange requires detailing the workflows, not only the objects. The goal of this research was to develop a new methodology to compile workflows and define detailed exchange models to support them.

The collaborative process of architectural façade design and precast detailing for fabrication was used as an example.  The research comprised experiments and case studies and development and analysis of the current and future workflows and the data objects needed for successful collaboration. Best practice for the use of 3D BIM tools in collaboration between architects and precast façade fabricators was explored, and shortcomings of the procedures and software available were highlighted. This was done by recording the processes and productivity achieved in parallel 2D and 3D workflows for the same project, identifying the productivity, the benefits and the problems encountered in each of the workflows. Appropriate workflows and the information data exchanges were identified. Objects missing from Industry Foundation Classes (IFC) schema were identified and defined.

The experience gained and the information elicited through the course of the experiments supported definition of current information exchanges and prospective new ones, identifying the use cases, data exchanges and the corresponding sets of data that need to be transferred using BIM software. The results of this analysis were compiled using the format of an Information Delivery Manual (IDM).

Analysis of the mapped exchange workflows enabled the author to define the exchanges in the form of tables identifying the information items required for each exchange. The definitions were compared with the contents of the current IFC schema version definitions to identify the objects missing for the exchange workflows for architectural precast pieces that were defined by the data requirements table.

Using this IDM, software developers will be able to write the appropriate additions (export and import routines) to the BIM tools based on the IFC schema.