Reinforced concrete structures require effective strengthening methods to improve shear capacity and ductility. Conventional external systems such as steel plates or CFRP sheets are limited by premature debonding and member damage. This study experimentally evaluated the shear performance of concrete beams strengthened with iron-based shape memory alloy (Fe-SMA) strips. Static loading tests compared the effects of prestressing activation, retrofit type and retrofit ratio. The activation of Fe-SMA effectively delayed the formation of shear cracks and reduced width. Also, the Fe-SMA suppressed the shear deformation of stirrups and concrete, resulting in enhanced shear performance and ductility of the strengthened beams. Overall, the Fe-SMA strengthening method was found to be effective in improving the serviceability and maintenance performance of reinforced concrete beams.

Abstract
1. 서론
2. Fe-SMA의 프리스트레싱 성능
    2.1 형상기억효과
    2.2 Fe-SMA의 프리스트레싱 성능 실험
3. 정적가력실험 개요
    3.1 실험체 상세 및 전단보강
    3.2 실험 계획
4. 실험 결과
    4.1 파괴 및 손상 양상
    4.2 하중-변위 관계
    4.3 철근 변형률
    4.4 콘크리트 전단변형률
5. 결론
감사의 글
References

• 김채원(고려대학교 건축사회환경공학과, 석사과정) | Kim Chaewon (Dept. of Civil, Environmental and Architectural Engineering, Korea University)
• 정동혁(고려대학교 건축사회환경공학부 부교수, 공학박사) | Jung Donghyuk (School of Civil, Environmental and Architectural Engineering, Korea University) Corresponding author