Risk-based seismic design of diagonal self-centering shape-memory alloy wire-based bracing system in multi-column bent bridges
- Authors
- Lee, Chang Seok; Jeon, Jong-Su
- Issue Date
- Aug-2023
- Publisher
- Elsevier Ltd
- Keywords
- Risk -based seismic design; Shape-memory alloy wire; Diagonal self-centering brace; Multi-column bent bridge
- Citation
- Engineering Structures, v.289, pp.1 - 15
- Indexed
- SCIE
SCOPUS
- Journal Title
- Engineering Structures
- Volume
- 289
- Start Page
- 1
- End Page
- 15
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/191987
- DOI
- 10.1016/j.engstruct.2023.116295
- ISSN
- 0141-0296
- Abstract
- In this paper, a risk-based seismic design method for diagonal self-centering braces (SCB) with shape memory alloy (SMA) wires implemented in multi-column bents is proposed to enhance the performance of older concrete bridge classes. An existing SMA-SCB system that improves the performance of older reinforced concrete building frames was adopted to numerically examine further applications to nonductile bridges. To this end, risk-based seismic design of the SMA-SCB to minimize the probability of collapse and demolition of bridge classes was developed by adopting a sophisticated finite element model that reflects the recentering behavior of an actual SMA-SCB; probabilistic bridge models considering uncertainties associated with the material and geometrical properties of bridges; refined failure condition; and the total probability theorem. A comparison of the results of the traditional seismic fragility-based and proposed designs indicated that the amount of SMA-SCB required by the former is nearly half of that required by the proposed approach because the traditional approach overemphasizes the demand at larger ground motion intensities.
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