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Analysis of the optimal diagrid geometry for tall buildings based on the desirability function

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Analysis of the optimal diagrid geometry for tall buildings based on the desirability function.

Rel. Alberto Carpinteri, Giuseppe Lacidogna, Domenico Scaramozzino. Politecnico di Torino, Corso di laurea magistrale in Ingegneria Civile, 2021

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Abstract:

The evolution of tall buildings has taken place worldwide, starting in the United States in the twentieth century, from the conventional moment resisting frame to more effective structural systems, such as brace tubes and diagrid structures. In this Thesis, attention has been paid on diagrid structures. Their capacity to withstand lateral loads, despite the lack of vertical columns along the external perimeter of the building, has made the diagrids highly appreciated in the fields of structural engineering and architecture. In particular, many researchers have emphasized their enhanced performance and ground-breaking aesthetic characteristics. The main purpose of the study is to identify the optimal diagrid geometry able to ensure simultaneously a good structural behaviour, in terms of lateral and torsional stiffness, low consumption of material and feasibility of construction. This investigation usually consists in optimization processes where some geometrical parameters, like the diagonal inclination and floor plan shape, are changed and the building performance is assessed. However, when the population of the geometrical solutions is wide, this procedure can hardly be implemented manually, or within a Finite Element Method (FEM) environment due to onerous computational costs. In this Thesis the analysis has been performed by using a previously developed matrix-based method (MBM), coupled with the desirability function approach. The MBM allows to perform the structural analysis of the diagrid system considering fewer degrees of freedom than FEM. The desirability function approach is a multi-response optimization method, that leads to the selection of the optimal design parameters. The analysis has aimed at selecting the optimal geometry, out of a set of both uniform- and varying-angle diagrid structures, in order to optimize multiple responses. The outcomes of this analysis demonstrated the value and the simplicity of the presented approach for the optimization of diagrid structures for the preliminary design.

Relators: Alberto Carpinteri, Giuseppe Lacidogna, Domenico Scaramozzino
Academic year: 2021/22
Publication type: Electronic
Number of Pages: 175
Subjects:
Corso di laurea: Corso di laurea magistrale in Ingegneria Civile
Classe di laurea: New organization > Master science > LM-23 - CIVIL ENGINEERING
Aziende collaboratrici: UNSPECIFIED
URI: http://webthesis.biblio.polito.it/id/eprint/21338
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