PSI - Issue 78

ScienceDirect Structural Integrity Procedia 00 (2025) 000 – 000 Structural Integrity Procedia 00 (2025) 000 – 000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Available online at www.sciencedirect.com ScienceDirect

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

Procedia Structural Integrity 78 (2026) 1151–1158

© 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of XX ANIDIS Conference organizers This paper experimentally analyses the effectiveness of pre-stressed stainless steel strips (CAM ® technology), which are externally applied on shear-critical RC columns to increase their shear strength without changing lateral stiffness. Cyclic pseudo-static tests are carried out under increasing top displacement on nominally identical cantilever columns, comparing the as-built condition with different retrofitting layout. Experimental results are described in terms of damage evolution and global response. Code prescriptions about the design of this technique are assessed based on the main experimental outcomes to provide suggestions for future optimization in the retrofitting design. © 2025 The Authors, Published by Elsevier B.V . Peer-review under responsibility of XX ANIDIS Conference organizers Keywords: pre-code/low-code buildings; reinforced concrete; shear failures; experimental tests; pre-stressed steel strips. Abstract Existing Reinforced Concrete (RC) buildings generally are vulnerable to seismic actions worldwide, often exhibiting shear failures, especially in high-seismicity areas, like Italy. According to obsolete technical or seismic codes in force in Italy until ‘80s, columns generally have a minimum amount of transverse reinforcement, thus often requiring a seismic improvement. Different strengthening techniques are nowadays spread in common practice to solve such critical failure typology, by means of FRP wrapping, RC or steel jacketing. This paper experimentally analyses the effectiveness of pre-stressed stainless steel strips (CAM ® technology), which are externally applied on shear-critical RC columns to increase their shear strength without changing lateral stiffness. Cyclic pseudo-static tests are carried out under increasing top displacement on nominally identical cantilever columns, comparing the as-built condition with different retrofitting layout. Experimental results are described in terms of damage evolution and global response. Code prescriptions about the design of this technique are assessed based on the main experimental outcomes to provide suggestions for future optimization in the retrofitting design. © 2025 The Authors, Published by Elsevier B.V . This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of XX ANIDIS Conference organizers Keywords: pre-code/low-code buildings; reinforced concrete; shear failures; experimental tests; pre-stressed steel strips. XX ANIDIS Conference Shear strengthening of existing reinforced concrete columns by pre stressed steel strips: experimental outcomes Maria Teresa De Risi a *, Carlo Del Gaudio a , Gerardo Mario Verderame a a Department of Structures for Engineering and Architecture, University of Naples Federico II, via Claudio 21, 80125, Naples Abstract Existing Reinforced Concrete (RC) buildings generally are vulnerable to seismic actions worldwide, often exhibiting shear failures, especially in high-seismicity areas, like Italy. According to obsolete technical or seismic codes in force in Italy until ‘80s, columns generally have a minimum amount of transverse reinforcement, thus often requiring a seismic improvement. Different strengthening techniques are nowadays spread in common practice to solve such critical failure typology, by means of FRP wrapping, RC or steel jacketing. XX ANIDIS Conference Shear strengthening of existing reinforced concrete columns by pre stressed steel strips: experimental outcomes Maria Teresa De Risi a *, Carlo Del Gaudio a , Gerardo Mario Verderame a a Department of Structures for Engineering and Architecture, University of Naples Federico II, via Claudio 21, 80125, Naples

* Corresponding author. Tel.: +390817683490; fax: +390817683490. E-mail address: mariateresa.derisi@unina.it * Corresponding author. Tel.: +390817683490; fax: +390817683490. E-mail address: mariateresa.derisi@unina.it

2452-3216 © 2025 The Authors, Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of XX ANIDIS Conference organizers 2452-3216 © 2025 The Authors, Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of XX ANIDIS Conference organizers

2452-3216 © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of XX ANIDIS Conference organizers 10.1016/j.prostr.2025.12.147