Iron-Based shape memory alloy for strengthening of 113-Year bridge

Vůjtěch, Jakub; Ryjáček, Pavel; Matos, José C.; Ghafoori, Elyas

doi:10.1016/j.engstruct.2021.113231

Cited by 60 publications

(15 citation statements)

References 27 publications

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“…The comparable stiffness of Fe-SMA strips and CFRP composites leads to the next benefit, i.e., (iii) alleviation of the need to assemble the Fe-SMA-CFRP composite patches, which results in time savings. Thus far, the mechanically clamped Fe-SMA strips have been successfully employed in fatigue strengthening of steel plates [23] and steel girders [24,25].…”

Section: Bonded Fe-sma Strengthening Solutionmentioning

confidence: 99%

Experimental investigation on debonding behavior of Fe-SMA-to-steel joints

Wang

Chatzi

et al. 2023

Construction and Building Materials

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Section: Bonded Fe-sma Strengthening Solutionmentioning

confidence: 99%

Experimental investigation on debonding behavior of Fe-SMA-to-steel joints

Wang

Chatzi

et al. 2023

Construction and Building Materials

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“…A mount of tests referring to FeSMA relaxation has been carried out over the last years published in [ 18 , 92 , 93 , 94 , 95 , 96 ]. Both the stress relaxation at the constant strain and creep at the constant stress occurred in the SMA material.…”

Section: Comparison Of Prestressed Fesma and Cfrp Behaviormentioning

confidence: 99%

“…Moreover, for the temperature in the range from −45 °C to 50 °C, the creep and relaxation are greater with the temperature drop (see Figure 10 ) [ 96 ]. A recovery stress decrease equal to 10% and 20% was observed after 1000 h in [ 18 , 93 , 94 ], respectively. The greater prestress losses were affected by the SMA slip in the anchorage, temperature fluctuations and the live traffic loads.…”

Section: Comparison Of Prestressed Fesma and Cfrp Behaviormentioning

confidence: 99%

Comparison of Prestressing Methods with CFRP and SMA Materials in Flexurally Strengthened RC Members

Rogowski

Kotynia

2022

Materials

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Over the years, prestressing concrete has become a well-known technique to improve the ultimate and serviceability state of RC members. Besides steel reinforcement, relatively new materials such as carbon fiber reinforced polymers (CFRP) or especially shape memory alloys (SMA) can be used to active strengthening. The main scope of this paper is to compare various prestressing methods using carbon composites and memory steel alloys. A description of SMA, shape memory effect, its utilization for prestressing, and CFRP materials are presented in the paper. Moreover, current state-of-the-art developments in the field of both materials, considering prestressing systems and available anchorage, material behavior, creep and stress relaxation, durability issues, thermal compatibility with concrete, and fire behavior, are described. A general revision of previous studies based on flexural strengthening using both materials is conducted and the selected results of these studies are briefly presented. The behavior of RC beams after strengthening with mentioned techniques is compared and discussed. Selected on-site applications are described to confirm the feasibility and practicality of the strengthening systems. Finally, the main advantages and disadvantages of CFRP and SMA materials for prestressing concrete structures are summarized and further recommendations for the future research are listed.

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“…The research included flexural and shear performance enhancement of concrete structures and fatigue strengthening of steel structures. Results showed that Fe-SMA was used as a prestressing material of concrete structures to enhance the bearing capability in the form of embedded (Czaderski et al, 2021;Hong K et al, 2018;Rojob and El-Hacha, 2017;Shahverdi et al, 2016aShahverdi et al, , 2016b or external (Michels et al, 2018;Montoya-Coronado et al, 2019;Vujtech et al, 2021) strengthening and improving ductility (Rojob and El-Hacha, 2015). The fatigue performance of steel structures strengthened with Fe-SMA was markedly improved (Chen et al, 2021;Fritsch et al, 2019;Izadi et al, 2018aIzadi et al, , 2018bIzadi et al, , 2019Wang et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Stress recovery behaviour of a large-diameter Fe-SMA stranded wire developed for structural prestressing loss compensation

Liu

Dong

Zhu

et al. 2022

Advances in Structural Engineering

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A new type of large-diameter iron-based shape memory alloy (Fe-SMA) stranded wire was developed, and its stress recovery behaviour was experimentally investigated in this study. The produced Fe-SMA stranded wires had a diameter of 15.2 mm, which were the same as the most commonly used steel-stranded wires. This kind of large-diameter Fe-SMA stranded wire matched the existing prestressed anchorage system to reduce application cost and accelerate the field application of the Fe-SMA in civil engineering. The effects of prestrain levels (4%, 6%, 8%, 10%), activation temperatures (200°C, 300°C, 400°C, 500°C), and secondary activation effect on the recovery stress of Fe-SMA stranded wires were analysed. Test results showed that the recovery stresses of the Fe-SMA stranded wire were 223–357 MPa. The maximum recovery stress was measured for the specimen with a prestrain of 8% and an activation temperature of 500°C. With increasing activation temperature, the recovery stress increased, but the increment decreased gradually. An increased prestrain level resulted in a first increase and a second decrease in the recovery stress, which was highest at the 8% prestrain level. If the shape memory effect (SME) was not fully used during the first activation, then the remaining martensitic phase changed on the second activation. The recovery stress generated by the first activation was essentially the same as those generated by the second activation at the same activation temperature. Taking the Nanshao River concrete box girder bridge in China as an example, the effect of using Fe-SMA stranded wires to compensate the prestressing loss was calculated. The results showed that the Fe-SMA stranded wire developed was able to compensate the vertical prestress loss of the prestressed box girder bridge web well and maintain the main tensile stresses at a low level during the service life of the bridge.

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Iron-Based shape memory alloy for strengthening of 113-Year bridge

Cited by 60 publications

References 27 publications

Experimental investigation on debonding behavior of Fe-SMA-to-steel joints

Experimental investigation on debonding behavior of Fe-SMA-to-steel joints

Comparison of Prestressing Methods with CFRP and SMA Materials in Flexurally Strengthened RC Members

Stress recovery behaviour of a large-diameter Fe-SMA stranded wire developed for structural prestressing loss compensation

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