Hysteretic Behavior Evaluation of Reinforced Concrete Columns  Retrofitted with Iron-based Shape Memory Alloy Strips

Saebyeok Jeong; Donghyuk Jung

doi:10.7734/COSEIK.2022.35.5.287

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2022 Vol.35, Issue 5 Preview Page Next Page

Research Paper

Hysteretic Behavior Evaluation of Reinforced Concrete Columns Retrofitted with Iron-based Shape Memory Alloy Strips 철계 형상기억합금 스트립으로 보강된 콘크리트 기둥의 반복이력거동 평가

31 October 2022. pp. 287-297

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Abstract

This paper presents experimental and analytical studies on the lateral cyclic behavior of RC columns actively confined with iron-based shape memory alloy (Fe-SMA) strips. Based on the Anexperimental study, we investigated the effectiveness of active confinement through compression testings of concrete cylinders confined by Fe SMA strips and carbon fiber-reinforced polymer (CFRP) sheets. The test results showed that the specimens confined with Fe SMA strips significantly increased the deformation capacity of the concrete, even under lower confining pressures, compared to those specimensconfined with CFRP sheets. The experimental results were used to develop finite-element models of RC columns confined with Fe SMA or CFRP in their plastic-hinge region. After validating the proposed analytical model through comparison with the results from a previous RC column test, a series of lateral cyclic load analyses were carried out for the RC columns confined with Fe SMA and CFRP. The analytical results revealed that the lateral cyclic behavior of the Fe SMA-confined column was greatly enhanced in terms of deformation and energy dissipation capacities compared with tothat of the as-built and CFRP-confined columns.

Keywords

iron-based shape memory alloy

active confinement

seismic retrofitting

cyclic load analysis

concrete columns

본 논문에서는 철계형상기억합금(Fe SMA) 스트립으로 능동구속된 콘크리트 기둥의 실험적, 해석적 연구결과를 제시한다. Fe SMA과 탄소섬유보강시트(CFRP)로 각각 구속된 콘크리트 공시체의 압축실험을 통해 형상기억합금 기반 능동구속기법의 효과성을 평가하였다. 실험결과, Fe SMA 스트립으로 구속된 콘크리트 공시체가 낮은 구속력에도 불구하고 CFRP 시트로 구속된 공시체에 비해 더 우수한 변형능력을 가지는 것으로 밝혀졌다. 실험을 통해 얻은 구속된 콘크리트의 압축거동 결과를 이용해 소성힌지 영역이 각각 Fe SMA 스트립과 CFRP 시트로 보강된 콘크리트 기둥의 유한요소모델을 구축하였다. 기존 수행된 콘크리트 기둥의 수평반복가력 실험결과를 바탕으로 구축된 기둥 모델을 검증하였고, 각각의 기둥 모델에 대한 수평반복가력 해석을 수행하였다. 해석결과, Fe SMA 스트립으로 보강된 콘크리트 기둥이 CFRP 시트로 보강된 기둥모델에 비해 변형, 에너지 소산능력 향상에 효과적임을 확인하였다.

키워드

철계 형상기억합금

수동구속

내진보강

반복가력해석

콘크리트 기둥

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Information

Publisher :Computational Structural Engineering Institute of Korea
Publisher(Ko) :한국전산구조공학회
Journal Title :Journal of the Computational Structural Engineering Institute of Korea
Journal Title(Ko) :한국전산구조공학회 논문집
Volume : 35
No :5
Pages :287-297
Received Date : 2022-06-24
Revised Date : 2022-08-08
Accepted Date : 2022-08-09
DOI :https://doi.org/10.7734/COSEIK.2022.35.5.287

Journal of the Computational Structural Engineering Institute of Korea ISSN:1229-3059(Print) 2287-2302(Online) 한국전산구조공학회 논문집

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