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A novel optimization strategy for form-finding and structural stability enhancement of dome-type grid-shell structures

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dc.contributor.author Abeyrathna, HMAM
dc.contributor.author Herath, HMST
dc.contributor.editor Pasindu, HR
dc.contributor.editor Damruwan, H
dc.contributor.editor Weerasinghe, P
dc.contributor.editor Fernando, L
dc.contributor.editor Rajapakse, C
dc.date.accessioned 2024-10-02T04:23:19Z
dc.date.available 2024-10-02T04:23:19Z
dc.date.issued 2024
dc.identifier.uri http://dl.lib.uom.lk/handle/123/22843
dc.description.abstract Domes are highly efficient structures designed to span long distances while effectively resisting gravity loads. Traditional domes can be categorized into two types: continuous shells, which are typically constructed from monolithic concrete or masonry, and grid-shells, which utilize lattice members to create depth throughout the shell thickness. Although grid-shells have gained popularity in recent years, the integration of topology optimization and size optimization for the form-finding of these structures remains relatively unexplored. This paper presents a novel framework for optimizing deep grid-shell structures through topology and size optimization techniques. The framework is structured as a multi-phase process. Initially, a deep grid-shell structure and the associated load type are defined. Subsequently, an equivalent continuous shell structure is established and subjected to an optimization process aimed at minimizing strain energy to determine the optimal grid arrangement. This arrangement is then utilized for size optimization to identify the optimal member sizes. Finally, a linear elastic analysis is conducted to compare the structural performance of the initial grid-shell, the topology-optimized continuous shell, and the grid-shell inspired by structural optimization. Two case studies demonstrate the framework's capability to generate innovative and practical grid-shell structures. In test case 01, a ring load of 1 N was applied at the apex of a deep dome with a radius of 12 m, resulting in a corresponding structural optimization-inspired grid-shell. The buckling capacity increased from 3.5 MN to 31.5 MN, while maximum stress decreased from 4.2 Pa to 3.0 Pa, and maximum displacement was reduced from 31.5 nm to 25.3 nm when compared to the initial defined grid-shell. In test case 02, a total point load of 1 N was applied to the same deep dome, yielding another structural optimization-inspired grid-shell. The buckling capacity improved from 8.5 MN to 10.1 MN, maximum stress decreased from 0.9 Pa to 0.2 Pa, and maximum displacement was reduced from 10.1 nm to 2.5 nm compared to the initial defined grid-shell. The results indicate significant enhancements in material efficiency and structural performance, with optimized designs achieving over a hundred percent increase in buckling capacities and reductions in stresses and displacements exceeding seventy percent. Future work will investigate the complexities of topology optimization for shallow versus deep shells, assess the impact of more realistic load applications on structural stability, and explore the flexural capacities of grid-shells with topology-optimized continuous arrangements. Additionally, potential challenges related to node connections due to wider members resulting from optimization will require further investigation to refine the framework for broader applications. en_US
dc.language.iso en en_US
dc.publisher Department of Civil Engineering, University of Moratuwa en_US
dc.subject Buckling capacity en_US
dc.subject Form-finding en_US
dc.subject Grid-shells en_US
dc.subject Size optimization en_US
dc.subject Topology optimization en_US
dc.title A novel optimization strategy for form-finding and structural stability enhancement of dome-type grid-shell structures en_US
dc.type Conference-Abstract en_US
dc.identifier.faculty Engineering en_US
dc.identifier.department Department of Civil Engineering en_US
dc.identifier.year 2024 en_US
dc.identifier.conference World Construction Symposium - 2024 en_US
dc.identifier.place Moratuwa en_US
dc.identifier.pgnos pp.43-44 en_US
dc.identifier.proceeding Proceedings of Civil Engineering Research Symposium 2024 en_US
dc.identifier.email sumuduh@uom.lk en_US
dc.identifier.doi https://doi.org/10.31705/CERS.2024.22 en_US


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  • CERS - 2024 [47]
    Civil Engineering Research Symposium 2024

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