A new experimental investigation into the effects of reinforcing mortar beams with superelastic SMA fibers on controlling and closing cracks

Choi, Eunsoo; Mohammadzadeh, Behzad; Kim, Dongkyun; Jeon, Jong‐Su

doi:10.1016/j.compositesb.2017.11.017

Cited by 56 publications

(13 citation statements)

References 58 publications

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“…The recovery stress due to the shape memory effect was the cause of crack-closing [ 13 , 14 , 15 ], prestressing [ 16 , 17 ], and crack-repairing [ 18 ] in the cementitious composite. The superelastic characteristic provides the self-recovering capacity under the unloading condition [ 19 , 20 , 21 ]. In reinforced mortar, the SMA fibers without heating for phase transformation play the passive fibers like steel, carbon, and glass fibers for providing only the bridging effect.…”

Section: Introductionmentioning

confidence: 99%

Straining Behavior of Mortar Reinforced by Cold Drawn Crimped and Dog-Bone-Shaped Fibers under Monotonic and Cyclic Compressions

2021

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The straining behavior of the shape memory alloy (SMA) fibers-reinforced mortar was investigated in this study by the monotonic compressive and cyclic compressive tests. Two types of SMA fibers with a crimped and dog-bone shape were used due to the high pullout resistance capacity, which guaranteed that the fibers and mortar matrix were composited well. The plain mortar was mixed with two different compositions to create the higher elastic modulus mortar matrix and the lower elastic modulus mortar matrix compared with the elastic modulus of SMA fibers. The results of the experimental test indicated that the non-heated SMA fibers could control the strains in both elastic and plastic phases; in which, the crimped fiber was more effective in precracking due to the higher composite capacity while the dog-bone-shaped fiber had a higher effect in post-cracking. After heating, the dog-bone-shaped fiber slipped more than that of the crimped fiber; thus, the heated crimped fiber was more effective than the heated dog-bone-shaped fiber in controlling strains after cracking. The effect of SMA fibers on the elastic modulus depended on both the elastic modulus of mortar matrix and the property of SMA fibers. In the plastic phase, the fibers were effective on reducing the speed of damage in monotonic case. An equation using reinforcing index was suggested for damage evolution in the cyclic case.

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Section: Introductionmentioning

confidence: 99%

Straining Behavior of Mortar Reinforced by Cold Drawn Crimped and Dog-Bone-Shaped Fibers under Monotonic and Cyclic Compressions

2021

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“…It is noted that in room temperature, the improved G-C model is fully focused on the loading conditions at a specified strain amplitude and strain rate. In previous studies, the superelastic SMAs have been widely employed in vibration control, structural strengthening and repair, and new damper devices (Graesser and Cozzarelli, 1992;Alam et al, 2007;Ozbulut and Hurlebaus, 2010;Ozbulut et al, 2011;Wang and Wu, 2011;Choi et al, 2018;Preciado et al, 2018;Hamdaoui et al, 2019;Mirzai et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Seismic Performance of Ni-Ti SMA Wires Equipped in the Spatial Skeletal Structure

Liu

Yang

et al. 2021

Front. Mater.

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Nickel Titanium (Ni-Ti) Shape Memory Alloy (SMA) can be used to limit response of structure during external disturbances such as large seismic events. This paper presents a seismic performance study of Ni-Ti SMA wires equipped in the spatial skeletal structure. First, an improved Graesser-Cozzarelli (G-C) numerical constitutive model of the Austenitic phase of NiTi SMA wire is established. By contrast, the model based on uniaxial cyclic loading experimental tests is demonstrated as feasibility and validity. Next, a method consisting of a three-layer steel spatial skeletal structure model equipped with SMA wires is employed for simulation and experimental tests. According to the obtained constitutive numerical model, the simulation program of vibration control is written to simulate the effect of vibration control of seismic EL-centro wave. Furthermore, a shaking table experimental test was designed to verify the vibration control effect under the same action of seismic EL-centro wave. By comparison of the results of the numerical simulation and shaking table test, dynamic responses of the displacement and acceleration for different floors with control and without control was concluded. The superior superelastic properties of SMA wires used in passive control are investigated and the correctness of the constitutive numerical model are verified as well. The results show that such a comprehensive analysis integrates seismic-resistant behavior of Ni-Ti SMA wires in this type of structure. Besides, proposed method has broad application prospects to address the issues in passive control field of building structures.

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“…Exerting the internal pressure, these deficiencies can cause crack initiation and subsequently crack propagation and failure (Cai et al, 2018; Khatri et al, 2015; Zakar and Budinski, 2017). To avoid these irreparable damages, there should be some efficacious ways to confine and reinforce the butt-fusion welded joints in HDPE pipes (Choi et al, 2018; Tariq et al, 2011; Zhao et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

Analytical and experimental study of shape memory alloy reinforcement on the performance of butt-fusion welded joints in high-density polyethylene pipe

Choi

Ostadrahimi

Youn

2020

Journal of Intelligent Material Systems and Structures

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In this article, a shape memory alloy wire is employed as confinement to enhance the flexural rigidity of the butt-fusion welded joints in the high-density polyethylene pipes. To this end, analytical and experimental studies are considered, when the shape memory alloy wire is wrapped around a butt-fusion joint and an internal pressure is applied to the high-density polyethylene pipe. To investigate the efficiency of shape memory alloy wire jacket on the performance of butt-fusion welded joint in high-density polyethylene pipe, two cases of perfect butt-fusion joint and imperfect butt-fusion joint are tested. The influence of the number of shape memory alloy wire jacket on the high-density polyethylene pipe joints as well as the effect of different flexural rigidities of the wire and high-density polyethylene pipe, and different diameters are evaluated. The deformation is measured using linear voltage displacement transducer and digital image correlation analysis at different location of the pipe length. In addition, radial strain of the pipes due to bulging is measured by electronic resistance strain gauges. Results show that the shape memory alloy wire jacket has a significant effect (33%) on enhancing imperfect butt-fusion welded joint of high-density polyethylene pipes.

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A new experimental investigation into the effects of reinforcing mortar beams with superelastic SMA fibers on controlling and closing cracks

Cited by 56 publications

References 58 publications

Straining Behavior of Mortar Reinforced by Cold Drawn Crimped and Dog-Bone-Shaped Fibers under Monotonic and Cyclic Compressions

Straining Behavior of Mortar Reinforced by Cold Drawn Crimped and Dog-Bone-Shaped Fibers under Monotonic and Cyclic Compressions

Seismic Performance of Ni-Ti SMA Wires Equipped in the Spatial Skeletal Structure

Analytical and experimental study of shape memory alloy reinforcement on the performance of butt-fusion welded joints in high-density polyethylene pipe

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