Shear strengthening of reinforced concrete beams using shape memory alloys

Rius, Joan M.; Cladera, A.; Ribas, Carlos; Mas, Benito

doi:10.1016/j.conbuildmat.2018.12.104

Cited by 41 publications

(12 citation statements)

References 25 publications

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“…Recently, SMAs, a class of metallic smart materials with different diameters and compositions (Abdulridha and Palermo, 2017; Fang et al, 2019; Mas et al, 2017; Navarro-Gómez and Bonet, 2019; Pareek et al, 2018), are emerging as an effective option for prestressing concrete (PC) structures, thanks to a unique microstructurally based thermomechanical phenomenon of SMA known as shape memory effect (SME) (Czaderski et al, 2014; Deng et al, 2006; El-Tawil and Ortega-Rosales, 2004; Hong et al, 2018; Li et al, 2007; Rius et al, 2017; Rojob and El-Hacha, 2017; Sawaguchi et al, 2006; Shahverdi et al, 2016; Soroushian et al, 2001; Zerbe et al, 2017). SME is described as the ability of SMA to recover its original shape, when heated, after being subjected to extreme deformation beyond the elastic range.…”

Section: Concrete Prestressing Using Smasmentioning

confidence: 99%

Local strengthening and repair of concrete bridge girders using shape memory alloy precast prestressing plate

Zhao

Andrawes

2020

Journal of Intelligent Material Systems and Structures

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Whether due to accidents, natural hazards, or harsh environmental conditions, concrete structures and bridges, in particular, experience local damages throughout their service life. Based on their severity, these damages can compromise the integrity of the structure. External prestressing is often used as an effective strengthening or repair technique for vulnerable or damaged structures, respectively. However, applying external prestressing in local regions of the structure with limited space can be problematic and not feasible for conventional prestressing techniques. This study investigates an innovative method for applying external prestressing in local regions of bridge girders using externally mounted precast prestressing plate reinforced with shape memory alloy wires. A thin mortar plate with embedded curved shape memory alloy wire was experimentally tested to validate the proposed prestressing concept. Afterward, finite element analysis was performed on a concrete bridge girder to numerically investigate the performance of shape memory alloy precast prestressing plate in enhancing the shear and flexural behavior of the girder. Experimental and numerical results evidently demonstrated the feasibility and effectiveness of the innovative method in strengthening and repairing concrete structures through external local prestressing.

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Section: Concrete Prestressing Using Smasmentioning

confidence: 99%

Local strengthening and repair of concrete bridge girders using shape memory alloy precast prestressing plate

Zhao

Andrawes

2020

Journal of Intelligent Material Systems and Structures

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“…The aforementioned literature review reveals that the majority of the conducted research is focused on the application of nonconventional jackets in strengthening methods of original RC structural members [17][18][19]21,22,24,[26][27][28][30][31][32][33][34]36,[38][39][40][41][42][43][44][45][48][49][50]56]. Significantly fewer studies investigate such jackets for the repair of preloaded and slightly damaged RC specimens [20,23,25,29,35,37,46,47,[51][52][53][54][55].…”

Section: Research Significancementioning

confidence: 99%

“…These reasons have led researchers to switch to new jacketing techniques with alternative materials such as steel [17][18][19], advanced materials such as fiber reinforced polymer (FRP) [20][21][22][23][24][25], textile reinforced concrete or mortar [26][27][28][29] and shape memory alloys [30][31][32], cement-based materials such as ferrocement [33][34][35][36], steel fibrous concrete or mortar [37][38][39][40], high-performance fiber reinforced concrete [41][42][43][44][45][46][47][48], self-compacting concrete (SCC) [49][50][51][52][53][54], and thin slightly reinforced flowable mortar [55,56]. Many of these jacketing techniques have been proved successful substitutes to common RC jacketing.…”

Section: Introductionmentioning

confidence: 99%

Repair of Heavily Damaged RC Beams Failing in Shear Using U-Shaped Mortar Jackets

et al. 2019

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The effectiveness of slightly reinforced thin U-shaped cementitious mortar jacketing for the repair of damaged shear-critical reinforced concrete beams is experimentally investigated. The test project includes two parts. In the first one, five concrete beams over-reinforced against flexure and under-reinforced against shear with different ratio of closed stirrups were initially subjected to monotonic loading until failure. The initially tested beams have been designed to fail in shear after wide diagonal cracking and to exhibit various strength and deformation capacities along with different levels of damages. In the second experimental part, the heavily damaged beams were jacketed with mild steel small diameter U-shaped transverse stirrups and longitudinal reinforcing bars. The retrofitted specimens using the proposed jacketing technique were tested again following the same four-point-bending load scheme. Based on the overall performance of the beams, it is deduced that the shear strength and deformation capability of the jacketed beams were substantially increased compared to the corresponding capacities of the initial beams. Further, although all beams failed in a shear abrupt manner, the retrofitted ones exhibited reduced brittleness and higher deflections at failure up to six times with respect to the initially tested specimens. The level of the initial damage influences the efficiency of the jacketing. Additional test data derived from relative shear-damaged beam specimens and retrofitted with similar thin jackets is also presented herein in order to establish the effectiveness of this repair system and to clarify the parameters affecting its structural reliability. Comparisons indicated that jacketed beams can alter the failure mode from brittle shear to ductile flexural under certain circumstances.

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“…For these reasons, a large number of analytical studies have been conducted to design SMA-based seismic devices using phenomenological models. Representative applications of SMAs in earthquake-resistant structures include beam-column connections, [10][11][12] reinforcing bars, [13][14][15][16][17][18] bridge connections, [19][20][21][22] dampers, [23][24][25][26] column jackets, 27,28 braces 24,[29][30][31][32] and buckling restrained devices. 33 Accounting for the effect of cycling on the SMA devices is of great importance because 1) the cyclic nature of earthquake ground motions may also affect the member response and 2) functional degradation 34 (or degradation of superelasticity 35 ) of bulk (untrained) SMAs can be observed during cyclic loads.…”

Section: Introductionmentioning

confidence: 99%

Phenomenological hysteretic model for superelastic NiTi shape memory alloys accounting for functional degradation

Lee

Jeon

2021

Earthq Engng Struct Dyn

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This study presents a simple hysteretic model to reproduce the stress-strain relationship of superelastic NiTi shape memory alloys (SMAs). The proposed model explicitly includes the functional degradation of SMAs, which has been ignored in earthquake engineering applications. This effect causes a reduction in the transformation stress and accumulation of residual strain. Because SMA devices are mainly used for seismic retrofit and account for a small portion of the structural system, their numerical model should not increase the computational time needed to perform nonlinear dynamic analyses. Computational efficiency can be achieved by representing their stress-strain response in a phenomenological way. Additionally, practitioners who may not have a professional background in materials science can easily manipulate the proposed model for the appropriate reproduction of model parameters such as transformation stress and residual strain. The ability to properly reproduce the experimental stress-strain response is validated for the test results of 65 NiTi SMA specimens. The amount of forward and reverse transformation stress degradation and the amount of residual strain accumulation per cycle, which are observed in the experimental results, are captured with reasonable accuracy in the proposed model. Additionally, the response of SMA braces in a four-story steel moment frame is modeled using the proposed model to examine the residual story drift of the SMA braced frame under a set of ground motions. At higher intensity levels, the functional degradation of SMA braces increased the residual story drift up to 60% in comparison to the SMA-braced model without functional degradation.

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Shear strengthening of reinforced concrete beams using shape memory alloys

Cited by 41 publications

References 25 publications

Local strengthening and repair of concrete bridge girders using shape memory alloy precast prestressing plate

Local strengthening and repair of concrete bridge girders using shape memory alloy precast prestressing plate

Repair of Heavily Damaged RC Beams Failing in Shear Using U-Shaped Mortar Jackets

Phenomenological hysteretic model for superelastic NiTi shape memory alloys accounting for functional degradation

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