Behavior of a simple concrete beam driven by shape memory alloy wires

Li, Hui; Liu, Zhiqiang; Ou, Jinping

doi:10.1088/0964-1726/15/4/017

Cited by 65 publications

(25 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Several reported experiments confirmed the feasibility of creating stresses in concrete components using SMA wires as external or embedded active reinforcement [3][4][5]. Also, recovery forces resulting from the activation of shape memory effect in SMA rods were used to reduce crack opening in a damaged structure [6].…”

Section: Introductionmentioning

confidence: 93%

Interaction Between Concrete Cylinders and Shape-Memory Wires in the Achievement of Active Confinement

Destrebecq

Balandraud

2010

Advanced Structured Materials

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 93%

Interaction Between Concrete Cylinders and Shape-Memory Wires in the Achievement of Active Confinement

Destrebecq

Balandraud

2010

Advanced Structured Materials

View full text Add to dashboard Cite

“…Direct heating using a live flame is not effective, either, since a large part of the heating energy is absorbed by the concrete. Previous studies used electronic resistance to heat embedded SMA bars (H. Li et al, 2006;L. Li et al, 2007); in such cases, the SMA bars should be continuous.…”

Section: Discussion and Applicationsmentioning

confidence: 99%

New SMA Short Fibers for Cement Composites Manufactured by Cold Drawing

Choi¹,

Kim²,

Jeon³

et al. 2016

JMSR

View full text Add to dashboard Cite

This study suggests new shape memory alloy reinforcing fibers manufactured by cold drawing method. This study prepares NiTi shape memory alloy (SMA) wires with diameter of 1.0 mm. Then, the wires are elongated by cold drawing and, thus, the diameters are reduced to 0.93 or 0.965 mm, respectively. This procedure introduces prestrain into the wires. When elongated SMA wires are heated, the shape memory effect is activated; this process recovers the deformed length as well as the reduced diameter due to Poisson's effect. Cold drawn wires with diameters of 0.93 and 0.965 mm recover diameters of 0.018 and 0.024 mm, respectively, with heating. The bulging of the SMA fiber in the radial direction inside cement composites induces confining pressure around the fiber and increases bond strength. When an SMA fiber is heated at the both ends, the heated parts bulge and the fiber shape looks like a dog-bone. Such a dog-bone shaped fiber can provide a geometrical anchoring action that also increases the bond resistance of the fiber. This study conducts pullout tests of SMA fibers to understand their pullout behavior and assess bond stress. The heated fibers and dog-bone shaped fibers increase pullout force compared to those of as-received and cold-drawn fibers. When dog-bone shaped fibers are heated, they show twice the pullout force of dog-bone shaped fibers without heating because geometric anchoring action as well as additional frictional resistance due to confining pressure are activated.

show abstract

“…During phase 0, the SMA elements are independent from the concrete elements, only at the end of phase 0 the nodes of SMA elements are linked to nodes of concrete elements in order to simulate the adherence between the two materials; -in phase 1, the flexural loading of the beam at environmental temperature is simulated. In this phase (time step [3][4], the displacement vB of the node B of the beam is gradually incremented; -in phase 2, the unloading of the beam at environmental temperature is reproduced. In this phase (time step [4][5] the displacement vB of the node B of the beam is gradually reduced until the vertical reaction of the node B reaches zero value ; -in phase 3,the heating of SMA equivalent bar is reproduced.…”

Section: Modelingmentioning

confidence: 99%

Modeling of smart concrete beams with shape memory alloy actuators

Malagisi

Marfia

Sacco

et al. 2014

Engineering Structures

View full text Add to dashboard Cite

ABSTRACT. In the present work, a computational strategy for the modeling of reinforced concrete beams with shape memory alloy (SMA) actuators for flexural cracks repair is developed. In particular, for the concrete, a nonlocal damage and plasticity model is adopted; the model is able to consider peculiar macroscopic behaviors which characterize the quasi-brittle materials, such as the tensile and compressive damaging, accumulation of irreversible strains and the unilateral phenomena. The development of the flexural cracks in concrete are modeled using the cohesive zone interface formulation, which accounts for the mode I, mode II and mixed mode of damage, the unilateral contact and the friction effects. The interface model considers even the coupling between the body damage and the interface damage ensuring that body damage and interface damage cannot evolve independently one from the other. A uniaxial SMA model able to reproduce both the pseudo-elastic behavior and the shape memory effect is adopted for the reinforcing SMA wires. Finally, finite element simulations are developed in order to reproduce the experimental behavior of smart concrete beams subjected to three-point bending tests. SOMMARIO.Nel presente lavoro è sviluppata una strategia computazionale per la modellazione di travi in calcestruzzo rinforzate con attuatori in materiale a memoria di forma (SMA) per la riparazione delle fessure flessionali. In particolare, per il calcestruzzo, si adotta il modello di danno non locale in grado di riprodurre le caratteristiche principali del comportamento macroscopico dei materiali quasi-fragili, come il danneggiamento in trazione e in compressione, l'accumulo di deformazioni plastiche e il fenomeno unilatero di richiusura delle micro-fessure da danno. La formazione delle fessure nel calcestruzzo è modellata usando la formulazione di un'interfaccia coesiva, che considera il danneggiamento in modo I, in modo II e in modo misto, il fenomeno dovuto al contatto unilatero e all'attrito. Il modello di interfaccia considera anche l'accoppiamento tra il danneggiamento del corpo e quello dell'interfaccia, assicurando che il danneggiamento del corpo e dell'interfaccia non evolvono indipendentemente l'uno dall'altro. Un modello uniassiale SMA capace di riprodurre sia l' effetto pseudo-elastico che quello a memoria di forma è utilizzato per i fili SMA. Infine, sono sviluppate simulazioni agli elementi finiti per riprodurre il comportamento sperimentale di travi in calcestruzzo intelligente sottoposte a prove di flessione su tre punti.

show abstract

Behavior of a simple concrete beam driven by shape memory alloy wires

Cited by 65 publications

References 15 publications

Interaction Between Concrete Cylinders and Shape-Memory Wires in the Achievement of Active Confinement

Interaction Between Concrete Cylinders and Shape-Memory Wires in the Achievement of Active Confinement

New SMA Short Fibers for Cement Composites Manufactured by Cold Drawing

Modeling of smart concrete beams with shape memory alloy actuators

Contact Info

Product

Resources

About