Potential applications of shape memory alloys in seismic retrofitting of exterior RC beam-column joints

Raj Suhail, Giuseppina Amato, Jian Fei Chen, Daniel McCrum

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    Abstract

    Shape memory alloys (SMAs) have the ability to undergo large deformations with minimum residual strain and also the extraordinary ability to undergo reversible hysteretic shape change known as the shape memory effect. The shape memory effect of these alloys can be utilised to develop a convenient way of actively confine concrete sections to improve their shear strength, flexural ductility and ultimate strain. Most of the previous work on active confinement of concrete using SMA has been carried out on circular sections. In this study retrofitting strategies for active confinement of non-circular sections have been proposed. The proposed schemes presented in this paper are conceived with an aim to seismically retrofit beam-column joints in non-seismically designed reinforced concrete buildings. SMAs are complex materials and their material behaviour depends on number of parameters. Depending upon the alloying elements, SMAs exhibit different behaviour in different conditions and are highly sensitive to variation in temperature, phase in which it is used, loading pattern, strain rate and pre-strain conditions. Therefore, a detailed discussion on the behaviour of SMAs under different thermo-mechanical conditions is presented first.
    Original languageEnglish
    Title of host publicationProcceedings for SECED 2015 Conference: Earthquake Risk and Engineering towards a Resilient World
    PublisherThe Society for Earthquake and Civil Engineering Dynamics
    Number of pages10
    Publication statusPublished - 09 Jul 2015
    EventSECED 2015 Conference: Earthquake Risk and Engineering towards a Resilient World - Homerton College, Cambridge, United Kingdom
    Duration: 09 Jul 201510 Jul 2015

    Conference

    ConferenceSECED 2015 Conference: Earthquake Risk and Engineering towards a Resilient World
    Country/TerritoryUnited Kingdom
    CityCambridge
    Period09/07/201510/07/2015

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