Nonlinear simulation of reinforced concrete beams retrofitted by near-surface mounted iron-based shape memory alloys

Abouali, S.; Shahverdi, Moslem; Ghassemieh, Mehdi; Motavalli, Masoud

doi:10.1016/j.engstruct.2019.02.060

Cited by 66 publications

(18 citation statements)

References 29 publications

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“…The tie interaction between the strips and the wall prevents this reduction in deformation, which ultimately causes tensile stress in the strips. In the second method, the stress is applied directly to the strips through predefined fields [ 50 , 51 ]. After assigning the pre-stressing force, an initial step without any loading was defined to establish self-equilibrium.…”

Section: Creating Post-tension In Numerical Models By Fe-sma Stripsmentioning

confidence: 99%

“…Figure 13 shows the stresses caused by the post-tensioning of SMA in the masonry walls, in which this stress can be transferred to the wall. Tie contact between SMA and wall causes this stress distribution [ 50 ]. Accordingly, in models where the strips are more distributed (UMW4 and UMW7), the more effective stress distribution is observed.…”

Section: Creating Post-tension In Numerical Models By Fe-sma Stripsmentioning

confidence: 99%

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Numerical Modeling of Unreinforced Masonry Walls Strengthened with Fe-Based Shape Memory Alloy Strips

et al. 2021

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This study presents a new way to improve masonry wall behavior. Masonry structures comprise a significant part of the world’s structures. These structures are very vulnerable to earthquakes, and their performances need to be improved. One way to enhance the performances of such types of structures is the use of post-tensioning reinforcements. In the current study, the effects of shape memory alloy as post-tensioning reinforcements on originally unreinforced masonry walls were investigated using finite element simulations in Abaqus. The developed models were validated based on experimental results in the literature. Iron-based shape memory alloy strips were installed on masonry walls by three different configurations, namely in cross or vertical forms. Seven macroscopic masonry walls were modeled in Abaqus software and were subjected to cyclic loading protocol. Parameters such as stiffness, strength, durability, and energy dissipation of these models were then compared. According to the results, the Fe-based strips increased the strength, stiffness, and energy dissipation capacity. So that in the vertical-strip walls, the stiffness increases by 98.1%, and in the cross-strip model's position, the stiffness increases by 127.9%. In the vertical-strip model, the maximum resistance is equal to 108 kN, while in the end cycle, this number is reduced by almost half and reaches 40 kN, in the cross-strip model, the maximum resistance is equal to 104 kN, and in the final cycle, this number decreases by only 13.5% and reaches 90 kN. The scattering of Fe-based strips plays an important role in energy dissipation. Based on the observed behaviors, the greater the scattering, the higher the energy dissipation. The increase was more visible in the walls with the configuration of the crossed Fe-based strips.

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Section: Creating Post-tension In Numerical Models By Fe-sma Stripsmentioning

confidence: 99%

Section: Creating Post-tension In Numerical Models By Fe-sma Stripsmentioning

confidence: 99%

Numerical Modeling of Unreinforced Masonry Walls Strengthened with Fe-Based Shape Memory Alloy Strips

et al. 2021

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“…The prestressing effect, which develops after the SMA heating, keeps the concrete members in compression or in case of flexure Materials 2021, 14, 4815 2 of 13 and reduces the tensile strains, thus preventing or reducing crack propagation. It decreases the deflection of the structural elements and increases their service life [13][14][15][16][17]. Figure 1a shows, as an example, FeMnSi-SMA strips used as a flexural strengthening of a reinforced concrete slab, while Figure 1b depicts FeMnSi-SMAs' bars applied to improve the shear carrying capacity of a beam.…”

Section: Introductionmentioning

confidence: 99%

Effect of Phase Changes on the Axial Modulus of an FeMnSi-Shape Memory Alloy

2021

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The axial modulus ESMA(κ) of FeMnSi-based shape memory alloys (FeMnSi-SMAs) is a parameter introduced in this study to characterize the relationship between stress and strain behavior at the early stage of tensile loading. ESMA(κ) can be used to correctly estimate and model the interaction forces between FeMnSi-SMAs and other materials. Unlike the conventional Young’s modulus, which is usually given at room temperature, the ESMA(κ) is evaluated at different temperatures and strongly depends on phase transformation and plastic deformation. This study investigated the evolution of ESMA(κ) during and after pre-straining as well as in the course of the activation processes. The effect of different factors (e.g., phase transformation and plastic deformation) on the magnitude of ESMA(κ) is discussed. The result shows that the ESMA(κ) can differ significantly during activation and thus needs to be modified when interaction forces between FeMnSi-SMAs and other substrates materials (e.g., concrete) must be modeled and evaluated.

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“…These materials have many benefits such as hardening of the strain, high resistance to corrosion and fatigue, the capability of returning to former shape by applying temperature and, tolerating strain less than 10% without leaving residual strain. Due to their unique characteristics, SMAs could have new functions in many fields such as medical, industrial, aerospace, and engineering applications [37][38][39]. Figure 1 shows the shape memory performance of these alloys Figure 1.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Response of the Post-Tensioned Tapered Steel Beams with Shape Memory Alloy Tendons

Hosseinnejad

Yaghin

Hosseinzadeh

et al. 2021

IJE

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The external post-tension technique is one of the best strengthening methods for reinforcement and improvement of the various steel structures and substructure components such as beams. In the present work, the load carrying capacity of the post-tensioned tapered steel beams with external shape memory alloy (SMA) tendons were studied. 3D nonlinear finite element method with ABAQUS software is used to determine the effects of the increase in the flexural strength, and the improvement of the load carrying capacity. The effect of the different parameters, such as geometrical characteristics and the post-tension force applied to the tendons were also studied in this research. The results revealed that the external posttension with SMA tendons in comparison with the steel tendons caused a significant improvement of the loading capacity. According to this, using SMA tendon for the reinforcement of the tapered beams resulted in a decrease in weight of these structures and as a consequence responded economic benefits in their application. This method can be used extensively for steel beams due to low executive costs and simplicity of the operation for post-tension.

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Nonlinear simulation of reinforced concrete beams retrofitted by near-surface mounted iron-based shape memory alloys

Cited by 66 publications

References 29 publications

Numerical Modeling of Unreinforced Masonry Walls Strengthened with Fe-Based Shape Memory Alloy Strips

Numerical Modeling of Unreinforced Masonry Walls Strengthened with Fe-Based Shape Memory Alloy Strips

Effect of Phase Changes on the Axial Modulus of an FeMnSi-Shape Memory Alloy

Numerical Investigation of Response of the Post-Tensioned Tapered Steel Beams with Shape Memory Alloy Tendons

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