Shape-memory NiTi alloy rebars in flexural-controlled large-scale reinforced concrete walls: Experimental investigation on self-centring and damage limitation

Almeida, João Saraiva Esteves Pacheco de; Steinmetz, Martin; Rigot, Fabrice; Cock, S de

doi:10.1016/j.engstruct.2020.110865

Cited by 24 publications

(6 citation statements)

References 32 publications

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“…These remarkable properties of SMA result from the reversible transformation phase they undergo, called the martensitic transformation. By replacing traditional steel bars with SMA bars in critical areas of structural members where plastic hinges will form, it is possible to increase the member's ductility [38][39][40][41][42][43][44][45][46][47], improve energy dissipation [48,49], and reduce residual deformations due to the material's superelasticity [48][49][50][51][52].…”

Section: Introductionmentioning

confidence: 99%

Design Recommendations for Columns Made of Ultra-High-Performance Concrete and NiTi SMA Bars

et al. 2023

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The use of new materials in construction endows structures with better mechanical characteristics. The combination of ultra-high-performance concrete (UHPC) and nickel and titanium (NiTi) shape memory alloy (SMA) improves the behavior of building structures by increasing both their ductility and dissipation energy due to the low-damage and self-centering properties of NiTi SMA. Since UHPC and NiTi SMA are expensive materials and still scarce in distribution channels, this article tries to offer design recommendations to reduce the length of the column-beam connection in which these new materials should be introduced, leaving the rest of the column with conventional materials. To achieve this, a nonlinear static pushover analysis of columns using finite element software, SeismoStruct, was performed. This model was calibrated using experimental results. Next, a parametric analysis was carried out to propose the design recommendations. Results indicated that an adequate design for the column–beam connection, considering both economy and performance, should include a main zone with UHPC and SMA reinforcements, a transition zone with UHPC and steel reinforcements, and another zone with conventional reinforced concrete. The transition zone improved the hybrid column’s performance without excessively raising the cost. The main zone length, the transition zone length, and the strength of the concrete in the rest of the column must be determined to ensure that the critical section of the column was in the main zone to develop the maximum strength and ductility. The length of the main zone depended on the compressive strength of the conventional concrete, the relative axial load of the column, and the required ductility.

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Section: Introductionmentioning

confidence: 99%

Design Recommendations for Columns Made of Ultra-High-Performance Concrete and NiTi SMA Bars

et al. 2023

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“…Shape memory alloys (SMAs) have gained widespread attention in recent years for their potential use in civil structures due to their unique thermomechanical properties, including the shape memory effect, superelasticity, and hysteretic damping. NiTi-based SMAs, in particular, have been found to have good energy dissipation and self-centering ability, making them suitable for use in seismic applications (Billah and Alam, 2012; Cortés-Puentes et al, 2018; De Almeida et al, 2020; Miralami et al, 2019; Sherif et al, 2018). In addition, SMAs have been explored as dampers (Li et al, 2018; Song et al, 2006) and bracing systems (Sun and Rajapakse, 2003; Zeynali et al, 2018) to enhance the seismic performance of civil structures.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of recovery stress by annealing and prestraining of NiTiNb wires

Yang

Liu

Zhong

et al. 2023

Journal of Intelligent Material Systems and Structures

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NiTiNb shape memory alloy has attracted much attention for its use in prestressing and remedying structural steel and concrete members due to its unique shape memory effect. However, the recovery stress values reported in the literature vary significantly, as the interplay between recovery stress and treatment parameters is not fully understood. In this study, we carefully investigated the effects of annealing and prestraining on the martensitic transformation behavior and mechanical properties of NiTiNb alloy and clarified their correlations to the recovery stress. Our results showed that the yield strength and superelasticity decreased while the ductility and retained stress-induced martensite increased with increasing annealing temperature. We found that high recovery stress can be achieved by annealing the sample above the recrystallization temperature while keeping the annealing temperature as low as possible to maintain high strength. Prestraining the sample to beyond the stress plateau but before yielding was found to be most effective for enhancing the recovery stress. By using these criteria, we were able to obtain large recovery stresses of greater than 550 MPa from 20°C to 200°C through a simple one-step annealing at 700°C and a 10% prestrain using commercial superelastic NiTiNb wire products.

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“…All these characteristic properties of SMA bars are the result of the reversible transformation phase that these materials undergo, which is called martensitic transformation. Replacing steel bars with Ni-Ti SMA bars in structural members' critical areas where plastic hinges will be formed can improve member ductility [31][32][33][34][35][36][37][38][39][40], energy dissipation [41,42] and the reduction of residual deformations due to its superelasticity [41][42][43][44][45]. Ni-Ti is the most widely used alloy [31][32][33][34][35][36], although other types exist like Fe-based SMAs [46][47][48][49] or Cu-based SMAs [38,39,[50][51][52].…”

Section: Introductionmentioning

confidence: 99%

Cyclic response of precast column-to-foundation connection using UHPC and Ni Ti SMA reinforcements in columns

Pereiro‐Barceló

Bonet

Rueda-García

et al. 2022

Engineering Structures

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Shape-memory NiTi alloy rebars in flexural-controlled large-scale reinforced concrete walls: Experimental investigation on self-centring and damage limitation

Cited by 24 publications

References 32 publications

Design Recommendations for Columns Made of Ultra-High-Performance Concrete and NiTi SMA Bars

Design Recommendations for Columns Made of Ultra-High-Performance Concrete and NiTi SMA Bars

Enhancement of recovery stress by annealing and prestraining of NiTiNb wires

Cyclic response of precast column-to-foundation connection using UHPC and Ni Ti SMA reinforcements in columns

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