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An innovative generative design strategy, based on shape grammar, is proposed for the minimum-weight design of diagrid tall buildings. By considering the building as a three-dimensional vertical cantilever beam with a tubular section under horizontal load, it is evident that bending and shear stiffness demands vary along the width and elevation of the building. Further, while the structural design of tall buildings is usually governed by stiffness, the predominant design criterion for diagrids could be the local strength demand, especially for low slenderness values, thanks to the inherent rigidity of the triangular pattern. Starting from these considerations, in this paper, a generative design strategy is proposed, able to find diagrid patterns that accommodate the differentiated stiffness demand along width/elevation and satisfy the predominant design criterion, stiffness or strength. The design strategy is applied to tall building models characterised by different slenderness values. The comparison to diagrid patterns analysed in previous literature works in terms of structural weight and performance parameters highlights the effectiveness of the design strategy and the efficiency of the generated patterns.
Francesco Cascone; Diana Faiella; Valentina Tomei; Elena Mele. A Structural Grammar Approach for the Generative Design of Diagrid-Like Structures. Buildings 2021, 11, 90 .
AMA StyleFrancesco Cascone, Diana Faiella, Valentina Tomei, Elena Mele. A Structural Grammar Approach for the Generative Design of Diagrid-Like Structures. Buildings. 2021; 11 (3):90.
Chicago/Turabian StyleFrancesco Cascone; Diana Faiella; Valentina Tomei; Elena Mele. 2021. "A Structural Grammar Approach for the Generative Design of Diagrid-Like Structures." Buildings 11, no. 3: 90.
Structural configurations best addressing the traditional requirements of strength and stiffness for tall buildings are the ones employing the tube concept, whose efficiency, however, is strictly related to the involved shear-resisting mechanism. In this perspective, diagrid structures – the latest mutation of tube structures – show an extraordinary efficiency, related to the adopted geometrical pattern: thanks to the triangle tessellation of the façades, internal axial forces are largely prevalent in the structural members, thus shear lag effects and racking deformations are minimized. Being also adaptable to whatever surface, diagrid is becoming the most used structural solution for tall buildings of complex form. In this paper some specific design issues for diagrid structures are identified, namely: the relative importance of strength and stiffness design criteria, as well as to the need of secondary bracing systems for counteracting the inter-module flexibility effects. Simplified procedure for dealing with such issues are proposed and design implications are discussed.
Elena Mele. 19.04: Diagrid: the renaissance of steel structures for tall buildings geometry, design, behavior. ce/papers 2017, 1, 4437 -4446.
AMA StyleElena Mele. 19.04: Diagrid: the renaissance of steel structures for tall buildings geometry, design, behavior. ce/papers. 2017; 1 (2-3):4437-4446.
Chicago/Turabian StyleElena Mele. 2017. "19.04: Diagrid: the renaissance of steel structures for tall buildings geometry, design, behavior." ce/papers 1, no. 2-3: 4437-4446.