A MODEL FOR INTEGRATED SPATIAL AND STRUCTURAL DESIGN OF BUILDINGS KEVIN MATTHEWS Artifice, Inc., P.O. Box 1588, Eugene, OR 97440

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1 A MODEL FOR INTEGRATED SPATIAL AND STRUCTURAL DESIGN OF BUILDINGS KEVIN MATTHEWS Artifice, Inc., P.O. Box 1588, Eugene, OR STEPHEN DUFF, DONALD CORNER Department of Architecture, University of Oregon, Eugene, OR Abstract. Recent advances in computer graphics and 3D user interfaces have enabled the emergence of 3D sketch modeling as a viable approach to architectural design, especially in the early schematic phase. This paper describes how a system can be built and used which integrates the capabilities of a good structural analysis system in the user-friendly working environment of a design-oriented modeling program. The structure of a building model as seen by finite element algorithms is a schematic idealization of the building's physical structure into nodes, elements, internal releases, boundary conditions, and loads. The more familiar architectural model used for design visualization represents spatial elements such as roofs, floors, walls, and windows.rather than treat these models independently, the structural model can be defined in relation to the architectural as a virtual model with inherited common characteristics and additional relational and attribute information, using feature-based geometry data structures to organize topological intelligence in the spatial model. This provides the basis for synchronous modification of structural and architectural aspects of the design. 1. Introduction With recent advances in computer graphics and 3D user interfaces, 3D sketch modeling has emerged as a viable and productive approach to architectural representation and design, especially in the early schematic phase. Concurrently, we have witnessed the development of effective analytical applications which support improved understandings of structural systems, energy performance, lighting and acoustics. As currently available, design and analysis applications remain largely independent and discontinuous. Not only do they lack a common integrated interface, but their underlying data structures are mutually unintelligible. As such, the various disparate applications are not easily applied in concert, effectively restricting their use to the end of the building design process. But to be truly generative, all basic design considerations must be explored from early in the design process. A major step toward a system capable of supporting the whole scope of the building design process would be achieved if the capabilities of the best analytical systems were made ready-to-hand in the user-friendly working environment of a design modeling program. If designers could move with equal facility between representations of the building form and analytical models of critical systems, the schematic design would emerge from a dramatically new creative context. A more comprehensive understanding of design determinates could exist at all stages of the design process. CAADRIA '98 : Proceedings of The Third Conference on Computer Aided Architectural Design Research in Asia. eds. T. Sasada, S. Yamaguchi, M. Morozumi, A. Kaga, and R. Homma April 22-24, Osaka University, Osaka, Japan. Pp

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