Elevated temperature behavior of an iron-based shape memory alloy used for prestressed strengthening of civil structures

Ghafoori, Elyas; Neuenschwander, Martin; Shahverdi, Moslem; Czaderski, Christoph; Fontana, Mario

doi:10.1016/j.conbuildmat.2019.03.098

Cited by 61 publications

(22 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The static tensile behavior and high-cycle fatigue behavior of the material in ambient temperatures for outdoor civil structures have been studied in [16,21,[26][27][28]. Moreover, the behavior of Fe-SMA under corrosive environmental conditions [29][30][31] and its long-term durability and stability [27,[32][33][34][35][36] have been investigated. Although there are a few studies on the corrosion behavior of this alloy (e.g., [30]), further research on this topic is necessary.…”

Section: Activated Fe-smas As a Strengthening Solutionmentioning

confidence: 99%

Iron-based shape memory alloy (Fe-SMA) for fatigue strengthening of cracked steel bridge connections

Izadi

Motavalli

Ghafoori

2019

Construction and Building Materials

Self Cite

View full text Add to dashboard Cite

Section: Activated Fe-smas As a Strengthening Solutionmentioning

confidence: 99%

Iron-based shape memory alloy (Fe-SMA) for fatigue strengthening of cracked steel bridge connections

Izadi

Motavalli

Ghafoori

2019

Construction and Building Materials

Self Cite

View full text Add to dashboard Cite

“…In the recent past a lot of research has been carried out on Fe-SMAs [19][20][21][22][23][24][25][26][27][28][29][30]. Fe-SMAs have started to gain popularity in the Civil Engineering due to their low cost and thus bears a good potential to be used in bulk.…”

Section: Introductionmentioning

confidence: 99%

Heat-activated prestressing of NiTiNb shape memory alloy wires

Suhail

Amato

McCrum

2020

Engineering Structures

View full text Add to dashboard Cite

Pre-strained shape memory alloys (SMAs) can develop significant level of recovery stress (prestress) when heated above their transformation temperature in the constrained conditions. In this study, thermo-mechanical tests were conducted to investigate heat-activated prestressing (HAP) of NiTiNb SMA wires. The tests were conducted to investigate: (1) the effect of pre-strain on reverse transformation temperatures ( and ) of the NiTiNb SMA;(2) the effect of strain rate and the pre-strain level on HAP;(3) post-HAP behaviour under monotonic and cyclic loading; and (4) reusability of the NiTiNb SMA wires for HAP applications. The digital image correlation technique was used to gain deeper insight into micro-mechanical behaviour of the SMA. The study highlights the complex material behaviour of the NiTiNb SMAs. The results from this study suggest that NiTiNb SMAs can be effectively used for HAP. Recommendations on optimal strain rate for pre-straining NiTiNb SMAs and the optimal pre-strain level for achieving maximum recovery stress in NiTiNb SMAs are given in this paper.

show abstract

“…Furthermore, fire protection is a crucial point. Composite material might require extensive protection against fire due to the low glass transition temperature of the resin; whereas, Fe-SMA can be treated as conventional steel and hence treated the same way in case a fire protection is to be installed [17].…”

Section: Introductionmentioning

confidence: 99%

Thermally activated iron-based shape memory alloy for strengthening metallic girders

Izadi

Hosseini

Michels

et al. 2019

Thin-Walled Structures

Self Cite

View full text Add to dashboard Cite

The study presents a new retrofit solution for strengthening metallic I-girders. The retrofit system involves two iron-based shape memory alloy (Fe-SMA, 'memory-steel') strips (each with a width and thickness of 50 and 1.5 mm, respectively) that are mechanically anchored (using friction clamps) to the girders. The shape memory effect (SME) of the Fe-SMA material has been used to activate/prestress the strips by heating to a predefined temperature. The main advantage of the proposed SMA-retrofit system is that, unlike conventional systems, it can prestress itself without a need for heavy hydraulic jacks, which then results in a significant reduction of the required time, labor works and cost of prestressing process. In order to evaluate the efficiency of the proposed retrofit system, in this study, a series of static and fatigue four-point bending tests were performed on a 6.4-m SMA-retrofitted beam. Five static

show abstract

Elevated temperature behavior of an iron-based shape memory alloy used for prestressed strengthening of civil structures

Cited by 61 publications

References 33 publications

Iron-based shape memory alloy (Fe-SMA) for fatigue strengthening of cracked steel bridge connections

Iron-based shape memory alloy (Fe-SMA) for fatigue strengthening of cracked steel bridge connections

Heat-activated prestressing of NiTiNb shape memory alloy wires

Thermally activated iron-based shape memory alloy for strengthening metallic girders

Contact Info

Product

Resources

About