Feasibility of using reduced length superelastic shape memory alloy strands in post-tensioned steel beam–column connections

Chowdhury, Md. Arman; Rahmzadeh, Ahmad; Moradi, Saber; Alam, M. Shahria

doi:10.1177/1045389x18806393

Cited by 34 publications

(25 citation statements)

References 54 publications

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“…Chowdhury et al presented a numerical simulation of cyclic behavior of post-tensioned beam-column connections with SMA strands to evaluate the effect of length on the connections. The results of this study show that the shorter length SMA strands are effective in regaining self-centering and dissipate the higher amount of energy compared to the steel strands [14]. Bajoria KM et al conducted a numerical analysis of three-story frame.…”

Section: Introductionmentioning

confidence: 83%

Seismic Performance of Two Story Steel Building Using Shape Memory Alloys (SMAs) Bars

Hameed

Abbas

2019

Civ Eng J

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Shape Memory Alloys (SMA) is type of smart materials that have ability to undergo large deformation and return back to their undeformed shape through heating (shape memory effect) or removal of load (superelastic effect). This unique ability is useful to enhance behavior of structure and seismic resistance. In this paper, superelasticity (SE) effect of NiTi alloys is used to improve the structural characteristics of steel building. The finite element analysis of steel building is done using ABAQUS v.2017. In order to compare the structural behavior of the steel building equipped with Shape Memory Alloy bars at beam-column connection, three steel building was modeled with a different combination of high strength steel bars and SMA bars. The steel building was checked for time history analysis by using Vrancea 1977 earthquake data. In order to estimate the recentring ability, residual of roof displacement and energy dissipation. The steel building equipped with SMA bars shows 82.7%, 152.72% recovery in residual roof displacement for steel building equipped with 50% SMA bars and 50% HS steel bars and steel building equipped with 100% SMA bars respectively, and moderate energy dissipation. In general, the frame equipped with 50% superelastic SMA bars and 50% HS steel bars provided better seismic performance.

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Section: Introductionmentioning

confidence: 83%

Seismic Performance of Two Story Steel Building Using Shape Memory Alloys (SMAs) Bars

Hameed

Abbas

2019

Civ Eng J

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“…Based on the design procedure of the SMA RC bridge pier, the diameter of the SMA rebar in the plastic hinge length is 30 mm. To date, about 30 different SE SMAs have been reported 44 . However, considering the required mechanical properties and specific temperature ranges, not all of them are suitable for structural engineering applications.…”

Section: Case Studymentioning

confidence: 99%

“…To date, about 30 different SE SMAs have been reported. 44 However, considering the required mechanical properties and specific temperature ranges, not all of them are suitable for structural engineering applications. Among these alloys, NiTi SMA has been widely used in commercial applications.…”

Section: Case Studymentioning

confidence: 99%

Seismic performance assessment of a multispan continuous isolated highway bridge with superelastic shape memory alloy reinforced piers and restraining devices

Wang

Alam

2020

Earthq Engng Struct Dyn

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The objective of this study is to analytically determine the effectiveness of a novel bridge system with superelastic (SE) shape memory alloy (SMA) reinforced concrete piers. The bridge is also equipped with SE SMA cable restrainers to prevent the bridge spans from a large displacement that can potentially cause span unseating. In the concrete bridge piers, the conventional steel reinforcements in the plastic hinge regions are replaced with SE SMA rebar to avoid large plastic deformation and improve its self-centering capacity. A typical three-span continuous highway bridge is modeled with SMA-reinforced piers and SMA restrainers. Numerical simulations of the bridge are conducted under destructive near-fault ground motions. The seismic responses and fragility curves of the novel bridge (Bridge IV) are assessed and compared with the reference bridge (Bridge I), the bridge with only SMA-reinforced piers (Bridge II), and the bridge with only SMA restrainers (Bridge III). The results revealed that the SMA-reinforced pier can successfully reduce the residual deformation and damage probability of the bridge; however, the bridge with only SMAreinforced piers is less efficient in preventing a large displacement. The use of SMA restrainers can efficiently limit the displacement of the bridge spans but increase the damage probability of the bridge piers. The proposed novel bridge having SMA-reinforced piers equipped with SMA restrainers (Bridge IV) is more efficient than the bridge with only SMA-reinforced piers (Bridge II)) or the bridge with only SMA restrainers (Bridge III).

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“…Besides, most of the previous studies have been focusing on the application of NiTi SMA. To date, more than 30 alloys with shape memory effect have been reported (Chowdhury et al, 2019). However, the seismic performance of highway bridges using other types of SMA restrainers such as Cu-based SMAs (Shrestha et al, 2013) and Fe-based SMAs (Omori et al, 2011; Tanaka et al, 2010) has not been investigated.…”

Section: Introductionmentioning

confidence: 99%

Performance-based seismic loss assessment of isolated simply-supported highway bridges retrofitted with different shape memory alloy cable restrainers in a life-cycle context

Dezfuli²,

Wang

et al. 2020

Journal of Intelligent Material Systems and Structures

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Shape memory alloy cables have emerged as an alternative to conventional steel cable restrainers for preventing the bridge spans from unseating during an extreme earthquake. Feasibility of high-cost NiTi shape memory alloy restrainers in retrofitting the bridges has been numerically investigated, and promising results have been published; however, considering the economic impacts, the effect of different types of shape memory alloy such as Cu-based and Fe-based shape memory alloy restrainers has not been discussed yet. The objective of this study is to address this problem in detail in order to propose the most cost-effective shape memory alloy restrainer suitable for bridge engineering applications. Seismic fragility and life-cycle loss (both direct and indirect) assessments are analytically performed on an isolated simply-supported highway bridge retrofitted by four types of shape memory alloy restrainers (i.e. NiTi, FeNiCoAlTaB, CuAlMn, and FeMnAlNi). Results showed that for all retrofitted bridges performed in the range of design displacement, the effect of type of shape memory alloy is significant on the damage probability and long-term seismic loss of the bridges. All the bridges retrofitted with shape memory alloy restrainers have a very low probability of collapse (less than 7%). It is also found that the bridge retrofitted with Fe-based shape memory alloy restrainers (SMA-II and SMA-IV) performed better as compared to the other cases. Compared to the bridge without restrainers and with NiTi shape memory alloy restrainers, Fe-based shape memory alloy restrainers can reduce the long-term loss by about 87% and 11%, respectively, at the design earthquake event specified in CHBDC-2014. The probabilistic risk analysis of highway bridges retrofitted with shape memory alloy restrainers can aid in paving the way toward widespread application of such smart materials in structural applications.

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Feasibility of using reduced length superelastic shape memory alloy strands in post-tensioned steel beam–column connections

Cited by 34 publications

References 54 publications

Seismic Performance of Two Story Steel Building Using Shape Memory Alloys (SMAs) Bars

Seismic Performance of Two Story Steel Building Using Shape Memory Alloys (SMAs) Bars

Seismic performance assessment of a multispan continuous isolated highway bridge with superelastic shape memory alloy reinforced piers and restraining devices

Performance-based seismic loss assessment of isolated simply-supported highway bridges retrofitted with different shape memory alloy cable restrainers in a life-cycle context

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