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A prototype for activity modelling in CAD-programs for building design

This project focuses on creating a prototype that models user activities within Computer-Aided Design (CAD) programs for building design. The prototype aims to support activity information management, addressing limitations in existing CAD tools that primarily focus on geometric representation. By integrating activity descriptions and relationships, the prototype serves as a "testbench" for analyzing usability and encouraging innovative ideas in architectural programming and spatial layout. The work includes exploring activity libraries and enhancing the design process through improved visualizations and data management.

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A prototype for activity modelling in CAD-programs for building design

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  1. A prototype for activity modelling in CAD-programs for building design Anders Ekholm, LTH Consultants: Stefan Larsson and Bengt Larsson, Lasercad AB Balàzs Piri and László Hatvani, Cadprojekt

  2. From drafting-oriented to object-oriented CAD • A prerequisite for computer integrated construction and facility management, CIC/FM, processes • CAD has mainly been used in the later stages of building design • Both activity and building are in focus in early stages • Today’s CAD programs do not support activity information management • Externally generated development may overlook ”tacit” knowledge • Ongoing research: EDM, SEED, BAS•CAAD etc.

  3. Today’s CAD-tools • A toolbox with a selection of objects: wall, slab, window, etc. • The tool creates a geometry object, e.g. a vertical plate, that may represent walls and barriers.

  4. Today’s CAD-tools Additional attributes can be edited through a dialogue window • Attributes, e.g. material, thickness, height, placement och centreline • Presentation, e.g. colour, material, layer

  5. Problem solving cycle • Architectural programming including activity description is part of the design process • Design of activities and building are mutually dependent

  6. The objectives of this project • Development of a program prototype for modelling user activities in the context of CAD for building design • The prototype shall act as a ”testbench” for usefulness analyses • Hopefully, the prototype will generate new ideas

  7. Information about activities in building design Activity information Activity areas/Aktiviteter Personnel support/Stödverksamhet Activity relationship information Communications/Kommunikation Material flow/Materialflöde Activity relationships/Relationer Resource and result information Product and material data/Produkt- och resursinformation Routings or manufacturing sequence data/ Processinformation Person information Personnel data/Personalinformation Equipment information Furniture, machinery and equipment data/ Möbler, maskiner och utrustning Building information Building (and process) support/ Byggnader och processanläggningar Hales, L.H. 1984 Computer Aided Facilities Planning

  8. Conceptual schema for the prototype program ”Activity Add-on”

  9. Activity design includes the definition of the spatial properties of the activity, e.g. by using a geometry tool in the CAD program

  10. The hatched area is defined as an activity through a command. Relation to other activities, duration etc., can be determined in a dialogue box

  11. This example of school layout design shows a floorplan and the activity tree for Groupwork in class A. Time settings show that it starts every monday at 12.45

  12. Activity modelling in CAD programs for building design • Development possibilities • Activity description: basis for acquisition of premises, existing or new • Space function programming • Visualisation of activities in buildings • Spatial layout design methods: relation matrices, area- and volume studies, flow schemas • Analyses of versatility of building spaces: further development of the Dutch SAR-methods • Activity libraries: Pattern language renewal • Process modelling

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