Evaluation of Seismic Response of Concrete Structures Reinforced by Shape Memory Alloys (Technical Note)

Jahangir, Hashem; Bagheri, Mansour

doi:10.5829/ije.2020.33.03c.05

Cited by 7 publications

(4 citation statements)

References 29 publications

(35 reference statements)

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“…The total water/cement ratio of all samples was kept constant at 0.35. To assess the compressive and tensile strengths of each concrete mix, six cylinders with a diameter of 150 mm and a height of 300 mm were manufactured and tested under a hydraulic jack [39][40][41]. The average compressive and tensile strength of three of those cylinders was considered as the specimens' strength.…”

Section: Materials and Specimens' Specificationsmentioning

confidence: 99%

Properties of Fibre-Reinforced High-Strength Concrete with Nano-Silica and Silica Fume

et al. 2021

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This study intends to assess the influence of steel fibres (SF) and polypropylene fibres (PPF) on the hardened and fresh state properties of high-strength concrete (HSC). For this purpose, 99 concrete mixes were designed and applied. SF and PPF were used at six-volume replacement contents of 0%, 0.1%, 0.2%, 0.3%, 0.4% and 0.5%. Moreover, nano-silica (NS) was used at three contents, 0%, 1% and 2%, and silica fume powder (SP) was also used at three weight ratios (0%, 5% and 10%). The slump, compressive and tensile strength, elasticity modulus, water absorption and the electric resistivity of concrete specimens were examined. The results showed that using 1% NS and 10% SP together with 0.5% PPF improved the compressive strength of HSC by about 123%; however, the effect of SF on tensile strength is more significant and adding 0.5% SF with both 2% NS and 10% SP increased the tensile strength by 104%. Moreover, increasing the SF content reduces the electric resistivity while using PPF improves this property especially when 1% NS was employed, and it was enhanced by about 68% when 0.5% SF and 1% NS were utilized with 10% SP.

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Section: Materials and Specimens' Specificationsmentioning

confidence: 99%

Properties of Fibre-Reinforced High-Strength Concrete with Nano-Silica and Silica Fume

et al. 2021

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“…Amongst smart materials shape-memory polymers (SMPs) could be listed due to their memory to return to their original shape with some approximation upon receiving an environmental trigger such as heat, moisture and chemicals [1,2]. Thermal sensitive SMPs require temperature around the glass transition (Tg) or melt temperature (Tm) of the polymer components to implement the start of shape-memory cycle from the secondary to the original shape [3,4].…”

Section: Introductionmentioning

confidence: 99%

High Energy Release-high Retraction Smart Polymer Fibers used in Artificial Muscle Fabrication

Karevan

Motalleb

Jannesari

et al. 2023

IJE

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Shape-memory polymers (SMPs) could remember their original shape and then, return to their initial shape upon stimulus. So far, quantities such as fixity and recovery ratio of SMPs have been broadly reported. Nevertheless, one main issue is the existence and use of an appropriate approach to quantitatively estimate the SMPs released energy. In addition, it is hypothesized that the elastic behavior of SMPs plays an underlying role when SMP fibers need to exhibit high-tension and high-elongation capacity as required in synthetic muscles. Here, we present, for first time, SMP trinary bulk and filament systems of acrylonitrile butadiene styrene (ABS)/thermoplastic polyurethane (TPU)/ethylene vinyl acetate (EVA) fabricated under calendering intense shear mixing and hot pressing. A digital blocked force load cell was used to record specimens energy released. The results exhibited high retraction from the specimens secondary shape correlated to the tensile behavior. It was shown the blended system of 50, 25 and 25% of TPU, ABS and EVA, respectively, resulted in ~640% and 3900% increase in the elastic modulus and energy release compared to EVA/TPU systems. The double SMP filaments led to a 50% increase in the energy release compared to single fibers. Nevertheless, the blended binary specimens with the TPU/ABS ratio of 50/50 exhibited 600% increase in tensile strength. It was confirmed the elastic modulus, number of fibers and elongation at break govern the SMP stored. The findings of the research lightened a new class of SMPs to be used as fiber-based artificial muscles and orthodontic products.

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“…One of the methods that can prevent the loss of materials as much as possible and reduce construction debris is retrofitting of buildings [4][5][6]. Increasing the strength of the structure is very important during the retrofitting because this will increase the useful life of the structure and residents will feel more secure [7][8][9]. Various studies have been conducted on retrofitting of RC beams.…”

Section: Introductionmentioning

confidence: 99%

Retrofitting of RC Beams using Reinforced Self-compacting Concrete Jackets Containing Aluminum Oxide Nanoparticles

Faez

Sayari

Manei

2021

IJE

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The purpose of this study was to introduce a proposed method to retrofit RC beams. For this purpose self-compacting concrete containing aluminium oxide nanoparticles (ANPs) and silica fume (SF) was used in RC jackets. The laboratory experiment and numerical simulation were used to investigate the behavior of the beams. The experimental variables were included the amount of ANPs used in the jackets (0 and 2.5% by weight of cement) and the surface interaction between beam and jacket (75% and 100% of the side and bottom surfaces of the beam). Five RC beams with a length of 1.4 m and the same dimensions were made and subjected to four-point loading. After completing the laboratory steps, RC beams were simulated according to laboratory conditions using the finite element method and ABAQUS software. After verifying the used method, parametric analysis was performed and parameters such as beam span length (1.5, 3, 4.5 m), concrete jacket thickness (4, 8, and 12 cm), and the diameter of the bars used in the jacket (8, 10 and 12 mm) were examined. The results showed that the use of RC jackets containing ANPs, depending on the jacket thickness, the diameter of the bars used in the jacket, and the length of the beam span increased the beams flexural strength by 155 to 447%. It was observed that the crushing of concrete without nanoparticles compared to concrete contain nanoparticles is more severe because nanoparticles affected the concrete matrix and reduced its crushing in RC jackets.

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Evaluation of Seismic Response of Concrete Structures Reinforced by Shape Memory Alloys (Technical Note)

Cited by 7 publications

References 29 publications

Properties of Fibre-Reinforced High-Strength Concrete with Nano-Silica and Silica Fume

Properties of Fibre-Reinforced High-Strength Concrete with Nano-Silica and Silica Fume

High Energy Release-high Retraction Smart Polymer Fibers used in Artificial Muscle Fabrication

Retrofitting of RC Beams using Reinforced Self-compacting Concrete Jackets Containing Aluminum Oxide Nanoparticles

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