Bond investigations of prestressed, near-surface-mounted, ribbed memory-steel bars with full bond length

Schranz, Bernhard; Czaderski, Christoph; Vogel, Thomas; Shahverdi, Moslem

doi:10.1016/j.matdes.2020.109145

Cited by 43 publications

(18 citation statements)

References 34 publications

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“…It should be noted that for RC structures, the target temperature during electric heating should be carefully controlled, since high temperatures may cause concrete cracking/damage and could be detrimental to the bond strength between Fe-SMA and concrete [ 73 ]. As reported in [ 125 ], a longitudinal splitting crack with a width of about 0.05 mm appeared in the mortar surface when the Fe-SMA was heated up to 190 °C. Most existing studies adopt a maximum activation temperature of around 160 °C, which can be regarded as a feasible target temperature.…”

Section: Research and Potential Engineering Applicationssupporting

confidence: 61%

“…Recent research and development activities enable a wider use of Fe-SMA in the construction industry. In particular, the research and application of Fe-SMA over the past 10 years can be mainly divided into two fields: (1) SME-induced prestressing technique for repairing and strengthening structures [ 112 , 113 , 114 , 115 , 116 , 117 , 118 , 119 , 120 , 121 , 122 , 123 , 124 , 125 , 126 , 127 , 128 , 129 , 130 , 131 , 132 , 133 , 134 , 135 , 136 , 137 , 138 , 139 ], and (2) seismic damping [ 23 , 28 , 75 ].…”

Section: Research and Potential Engineering Applicationsmentioning

confidence: 99%

“…Deeper embedment depth and ribbed surface for Fe-SMA strips are recommended for practical application [ 124 ]. It is also found that the current design guidelines would underestimate the necessary anchorage length for Fe-SMA bars [ 125 ]. The corresponding calculation methods are yet to be available.…”

Section: Research and Potential Engineering Applicationsmentioning

confidence: 99%

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Iron-Based Shape Memory Alloys in Construction: Research, Applications and Opportunities

Zhang

et al. 2022

Materials

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As a promising candidate in the construction industry, iron-based shape memory alloy (Fe-SMA) has attracted lots of attention in the engineering and metallography communities because of its foreseeable benefits including corrosion resistance, shape recovery capability, excellent plastic deformability, and outstanding fatigue resistance. Pilot applications have proved the feasibility of Fe-SMA as a highly efficient functional material in the construction sector. This paper provides a review of recent developments in research and design practice related to Fe-SMA. The basic mechanical properties are presented and compared with conventional structural steel, and some necessary explanations are given on the metallographic transformation mechanism. Newly emerged applications, such as Fe-SMA-based prestressing/strengthening techniques and seismic-resistant components/devices, are discussed. It is believed that Fe-SMA offers a wide range of applications in the construction industry but there still remains problems to be addressed and areas to be further explored. Some research needs at material-level, component-level, and system-level are highlighted in this paper. With the systematic information provided, this paper not only benefits professionals and researchers who have been working in this area for a long time and wanting to gain an in-depth understanding of the state-of-the-art, but also helps enlighten a wider audience intending to get acquainted with this exciting topic.

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Section: Research and Potential Engineering Applicationssupporting

confidence: 61%

Section: Research and Potential Engineering Applicationsmentioning

confidence: 99%

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Iron-Based Shape Memory Alloys in Construction: Research, Applications and Opportunities

Zhang

et al. 2022

Materials

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“…Reinforcement concrete (RC) bridges might need strengthening or repair at some stages during their service period, due to aging, the increase in the service loads, or change in demands [1,2], which is a global problem [3][4][5]. Many reinforcement systems or intelligent retrofitting techniques have been studied in the past few decades to prolong the lifetime of the available infrastructures by improving the load-bearing capacity and enhancing the workability of structures in service and ultimate conditions [1,6].…”

Section: Introductionmentioning

confidence: 99%

Achievements and Perspectives on Fe-Based Shape Memory Alloys for Rehabilitation of Reinforced Concrete Bridges: An Overview

2022

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Reinforced concrete (RC) bridges often face great demands of strengthening or repair during their service life. Fe-based shape memory alloys (Fe-SMAs) as a kind of low-cost smart materials have great potential to enhance civil engineering structures. The stable shape memory effect of Fe-SMAs is generated by, taking Fe-Mn-Si alloys as an example, the martensite transformation of fcc(γ) → hcp(ε) and its reverse transformation which produces considerable recovery stress (400~500 MPa) that can be used as prestress for reinforcement of RC bridges. In this work, the mechanism, techniques, and applications of Fe-SMAs in the reinforcement of RC beams in the past two decades are classified and introduced in detail. Finally, some new perspectives on Fe-SMAs application in civil engineering and their expected evolution are proposed. This paper offers an effective active rehabilitation alternative for the traditional passive strengthening method of RC bridges.

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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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Bond investigations of prestressed, near-surface-mounted, ribbed memory-steel bars with full bond length

Cited by 43 publications

References 34 publications

Iron-Based Shape Memory Alloys in Construction: Research, Applications and Opportunities

Iron-Based Shape Memory Alloys in Construction: Research, Applications and Opportunities

Achievements and Perspectives on Fe-Based Shape Memory Alloys for Rehabilitation of Reinforced Concrete Bridges: An Overview

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

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