Uncertainties in seismic demand and structural capacity create conservatism in the acceptance criteria of structural performance levels. This conservatism can be reduced and designs optimised by considering and reducing uncertainties. In seismic rehabilitation, a secondary system added to an existing structure has probabilistic parameters that can lead to changes in existing uncertainties. In this work, a steel moment frame was rehabilitated with a steel shear wall (SSW). Structural uncertainties were investigated by considering probabilistic variables of the force–deformation relationship of the SSW. The results showed that structural uncertainty increased the total uncertainty by 2.0–9.3%. Previous studies that have not considered structural uncertainty due to the force–deformation relationship and may not provide results with appropriate conservatism. As a result, the dispersion of the total uncertainties of a structure rehabilitated with a SSW is close to the dispersion value of a moment frame equipped with a brace, but is more than the dispersion value of the moment frame structure. A parametric study of the reliability index was performed based on probabilistic variables. Based on the results, the structural uncertainty reduced the reliability index by 0.57–1.28%.
In performance-based engineering, conservatism in acceptance criteria at structural performance levels has increased the cost of retrofitting. In seismic rehabilitation of structures, uncertainties have been studied on existing structures, and rehabilitation guidelines have been implemented on these uncertainties by reliability index. The secondary system which is added to the existing structure also has uncertainties in seismic rehabilitation of structures. These uncertainties can increase the uncertainties of rehabilitated structure and they can change the results of analysis, such as reliability index parameter, the values of fragility, and inter-story drift. Therefore, in this study, the reliability of structure rehabilitated with steel shear wall has been tested and a parametric study on the reliability index has been done. The selected structure was a steel moment frame, which was rehabilitated by the steel shear wall. The structure was subject to incremental dynamic analysis before and after rehabilitation with probabilistic variables. Based on the results, the values of the reliability index were obtained for the rehabilitated structure in the presence of uncertainties. According to results, rehabilitation of structure has decreased failure probability, and consideration of uncertainties of the rehabilitated structure has increased failure probability. Therefore, existing conservatism has been decreased.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.