Optimized seismic retrofit of steel-concrete composite buildings

PAPAVASILEIOU, Georgios, CHARMPIS, Dimos C and LAGAROS, Nikos D (2020). Optimized seismic retrofit of steel-concrete composite buildings. Engineering Structures, 213: 110573.

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Link to published version:: https://doi.org/10.1016/j.engstruct.2020.110573


This work is focused on comparatively assessing the cost-effectiveness of three seismic retrofit approaches for non-code-conforming frame buildings with steel-concrete composite columns. The first two of the assessed retrofit approaches aim in indirectly enhancing structural system performance by strengthening individual composite columns using reinforced concrete jackets or concrete-covered steel cages. The third retrofit approach considered aims in upgrading the composite building frame at hand by installing steel bracings at selected bays. A specially developed structural optimization procedure is used to perform an objective comparison of the cost-effectiveness of the three retrofit approaches. The objective of the optimization procedure is to minimize the total retrofit material cost, while constraints are imposed to ensure the satisfaction of design requirements for the retrofitted structure regarding member capacities (according to Eurocodes 3 and 4 for steel beams and composite columns, respectively), structural system performance under horizontal loading (based on interstorey drifts calculated by pushover analyses) and fundamental periods (obtained from eigenvalue analyses). By defining 30 cases of under-designed 2-storey, 4-storey and 6-storey composite buildings (i.e. buildings with steel-concrete composite columns), an extensive numerical investigation involving 120 retrofit optimization runs was conducted. The results obtained provide insight into the relative cost-effectiveness of the three seismic retrofit approaches and reveal certain conditions under which each approach is economically most viable.

Item Type: Article
Uncontrolled Keywords: 0905 Civil Engineering; 0912 Materials Engineering; 0915 Interdisciplinary Engineering; Civil Engineering; 4005 Civil engineering; 4016 Materials engineering
Identification Number: https://doi.org/10.1016/j.engstruct.2020.110573
SWORD Depositor: Symplectic Elements
Depositing User: Symplectic Elements
Date Deposited: 07 Sep 2023 15:57
Last Modified: 11 Oct 2023 12:00
URI: https://shura.shu.ac.uk/id/eprint/32221

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