Journal Articles Engineering Structures Year : 2020

Shape optimization of braced frames for tall timber buildings: Influence of semi-rigid connections on design and optimization process

Koliann Mam
  • Function : Correspondent author
Cyril Douthe
  • Function : Author
  • PersonId : 776792
  • IdRef : 159668670
François Consigny
  • Function : Author

Abstract

With the recent development of timber as a viable structural material for high-rise structures, glulam braced frames have been recently introduced in lateral load-resisting systems of timber buildings. Based on a simple shape optimization problem of a braced frame, this paper explores one of the specificities of timber structures: the influence of semi-rigid connections on their overall structural behavior and design. Dowel-type connections are first studied to obtain a simplified relation between joint stiffness and axial load-carrying capacity. Then, the established local behavior law is introduced in the shape optimization process and design of a discrete braced frame subject to lateral drift constraint under wind load. The problem is solved by a COBYLA optimization method, combined with Optimality Criteria (OC) member sizing techniques. Solutions are then evaluated and compared with classical steel/concrete design. The semi-rigid behavior of connections finally leads to a significant increase in the volume of timber but also affects the optimal shape and topology of the X-braced frame compared with classical results.
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Dates and versions

hal-03490294 , version 1 (10-05-2022)

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Koliann Mam, Cyril Douthe, Robert Le Roy, François Consigny. Shape optimization of braced frames for tall timber buildings: Influence of semi-rigid connections on design and optimization process. Engineering Structures, 2020, 216, pp.110692. ⟨10.1016/j.engstruct.2020.110692⟩. ⟨hal-03490294⟩
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