THESIS
2018
8 unnumbered pages, vi, 88 pages : illustrations ; 30 cm
Abstract
Many modern commercial buildings involve complex shaped façades, resulting in
increasing complexity as well as challenges in façade fabrication and assembly processes.
Currently, fabrication drawings are essential for fabrication, design evaluation and
inspection of building components.
Computer-aided automation, which can significantly
improve the efficiency and accuracy of the fabrication and assembly process, is thus
essential for the generation of façade fabrication drawings, thereby supporting the
fabrication and assembly of the building façade components. Among current computer-aided
technologies, building information modeling (BIM) has been widely applied to many
sophisticated building projects due to its comprehensive ability in digital representation of
building mode...[
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Many modern commercial buildings involve complex shaped façades, resulting in
increasing complexity as well as challenges in façade fabrication and assembly processes.
Currently, fabrication drawings are essential for fabrication, design evaluation and
inspection of building components.
Computer-aided automation, which can significantly
improve the efficiency and accuracy of the fabrication and assembly process, is thus
essential for the generation of façade fabrication drawings, thereby supporting the
fabrication and assembly of the building façade components. Among current computer-aided
technologies, building information modeling (BIM) has been widely applied to many
sophisticated building projects due to its comprehensive ability in digital representation of
building models. BIM has demonstrated its advantages over generating different types of
drawings. However, generating fabrication drawings for façade panels using conventional
approaches is time-consuming and error prone, especially when the number of façade
components become huge. Therefore, this thesis aims to develop BIM-based
methodologies to automate the generation of fabrication drawings for façade components,
thereby facilitating the whole construction process.
For façade panels, a BIM-based framework is proposed for the automatic generation
of fabrication drawings for façade panels. The framework integrates both graphical and
non-graphical information from BIM models and other external data sources. Specific
algorithms are applied to automatically generate the graphical information on the drawing
templates based on the BIM geometric models. Title blocks of the drawing templates are
also automatically filled in with corresponding non-graphical information. Complete
fabrication drawings as well as a tabulated file with essential graphical information on
similar components are then generated automatically.
For structural components such as mullions and transoms, it is important to represent
their physical characteristics clearly, thus a large number of section views need to be
produced, which is a time-consuming process and very labor intensive. Therefore,
automatic generation of fabrication drawings for building façade components (such as
mullions and transoms) is of paramount importance. In this thesis, attempts have been made
to develop an efficient framework in order to automatically generate fabrication drawings
for building façade structural components, including mullions and transoms. To represent
the complex physical characteristics (such as holes and notches) on mullions and transoms
using minimum number of drawing views, a computational algorithm based on graph
theory is developed to eliminate duplicated section views. Another methodology regarding
the generation of breaks for front views is also proposed to further improve the quality of
drawing layouts. The obtained drawing views are then automatically arranged using a
developed approach. In addition, primary dimensions of the drawing views focusing on the
physical features are also generated. Furthermore, in order to maintain the consistency of
the drawing formats, a methodology is proposed to simulate the scales of the drawings by
using clustering technique.
With the adoption of the proposed BIM-based methodologies, time and human effort
in the generation of fabrication drawings for façade components can be significantly
reduced, and all the fabrication drawings for similar components will follow a consistent
drawing format with explicit layout, thereby enhancing their readability.
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