Analysis and design recommendations for structures strengthened by prestressed bonded Fe-SMA
Previous studies have demonstrated a great potential of prestressed strengthening of structures employing iron-based shape memory alloys (Fe-SMAs). A bonded Fe-SMA strengthening solution with partial activation has been proposed. However, an analytical model for assessing the strengthening efficienc...
| Main Authors: | , , , , |
|---|---|
| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2024
|
| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/178708 |
| _version_ | 1824455201127399424 |
|---|---|
| author | Li, Lingzhen Wang, Sizhe Chatzi, Eleni Motavalli, Masoud Ghafoori, Elyas |
| author2 | Singapore Centre for 3D Printing |
| author_facet | Singapore Centre for 3D Printing Li, Lingzhen Wang, Sizhe Chatzi, Eleni Motavalli, Masoud Ghafoori, Elyas |
| author_sort | Li, Lingzhen |
| collection | NTU |
| description | Previous studies have demonstrated a great potential of prestressed strengthening of structures employing iron-based shape memory alloys (Fe-SMAs). A bonded Fe-SMA strengthening solution with partial activation has been proposed. However, an analytical model for assessing the strengthening efficiency was lacking, due to the unique nature of the employed prestressing mechanism involving heating. In this study, a symmetric strengthening model and an asymmetric strengthening model are developed to analyze the prestress level in steel and glass beams and plates strengthened by bonded Fe-SMA strips. The asymmetric strengthening model is then modified to analyze reinforced concrete (RC) beams strengthened by embedded Fe-SMA rebars. Recovery stress at different activation temperatures, the influence of the activation temperature on the adhesive bond, as well as the prestress loss resulting from the deformation of substrate elements and adhesive joints are taken into account. The predicted strains and deflections in the parent structure closely approximate the experimental measurements that appear in current literature. A parametric study and a sensitivity analysis are then conducted to assess the impact of the four influential features on the final prestress level, and their impact is ranked in the following order: recovery stress ≈ Fe-SMA width > activation length > bonded anchorage length. Based on these findings, a design strategy, in line with Eurocode 0, for the bonded/embedded Fe-SMA strengthening system is proposed. Finally, some perspectives on potential areas for future research are offered. |
| first_indexed | 2025-02-19T03:34:26Z |
| format | Journal Article |
| id | ntu-10356/178708 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2025-02-19T03:34:26Z |
| publishDate | 2024 |
| record_format | dspace |
| spelling | ntu-10356/1787082024-07-03T15:36:56Z Analysis and design recommendations for structures strengthened by prestressed bonded Fe-SMA Li, Lingzhen Wang, Sizhe Chatzi, Eleni Motavalli, Masoud Ghafoori, Elyas Singapore Centre for 3D Printing Engineering Iron-based shape memory alloy Memory steel Previous studies have demonstrated a great potential of prestressed strengthening of structures employing iron-based shape memory alloys (Fe-SMAs). A bonded Fe-SMA strengthening solution with partial activation has been proposed. However, an analytical model for assessing the strengthening efficiency was lacking, due to the unique nature of the employed prestressing mechanism involving heating. In this study, a symmetric strengthening model and an asymmetric strengthening model are developed to analyze the prestress level in steel and glass beams and plates strengthened by bonded Fe-SMA strips. The asymmetric strengthening model is then modified to analyze reinforced concrete (RC) beams strengthened by embedded Fe-SMA rebars. Recovery stress at different activation temperatures, the influence of the activation temperature on the adhesive bond, as well as the prestress loss resulting from the deformation of substrate elements and adhesive joints are taken into account. The predicted strains and deflections in the parent structure closely approximate the experimental measurements that appear in current literature. A parametric study and a sensitivity analysis are then conducted to assess the impact of the four influential features on the final prestress level, and their impact is ranked in the following order: recovery stress ≈ Fe-SMA width > activation length > bonded anchorage length. Based on these findings, a design strategy, in line with Eurocode 0, for the bonded/embedded Fe-SMA strengthening system is proposed. Finally, some perspectives on potential areas for future research are offered. Published version The first and second authors wish to express their gratitude toward China Scholarship Council (CSC) for the financial support to their PhD projects. 2024-07-03T01:32:26Z 2024-07-03T01:32:26Z 2024 Journal Article Li, L., Wang, S., Chatzi, E., Motavalli, M. & Ghafoori, E. (2024). Analysis and design recommendations for structures strengthened by prestressed bonded Fe-SMA. Engineering Structures, 303, 117513-. https://dx.doi.org/10.1016/j.engstruct.2024.117513 0141-0296 https://hdl.handle.net/10356/178708 10.1016/j.engstruct.2024.117513 2-s2.0-85182504252 303 117513 en Engineering Structures © 2024 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). application/pdf |
| spellingShingle | Engineering Iron-based shape memory alloy Memory steel Li, Lingzhen Wang, Sizhe Chatzi, Eleni Motavalli, Masoud Ghafoori, Elyas Analysis and design recommendations for structures strengthened by prestressed bonded Fe-SMA |
| title | Analysis and design recommendations for structures strengthened by prestressed bonded Fe-SMA |
| title_full | Analysis and design recommendations for structures strengthened by prestressed bonded Fe-SMA |
| title_fullStr | Analysis and design recommendations for structures strengthened by prestressed bonded Fe-SMA |
| title_full_unstemmed | Analysis and design recommendations for structures strengthened by prestressed bonded Fe-SMA |
| title_short | Analysis and design recommendations for structures strengthened by prestressed bonded Fe-SMA |
| title_sort | analysis and design recommendations for structures strengthened by prestressed bonded fe sma |
| topic | Engineering Iron-based shape memory alloy Memory steel |
| url | https://hdl.handle.net/10356/178708 |
| work_keys_str_mv | AT lilingzhen analysisanddesignrecommendationsforstructuresstrengthenedbyprestressedbondedfesma AT wangsizhe analysisanddesignrecommendationsforstructuresstrengthenedbyprestressedbondedfesma AT chatzieleni analysisanddesignrecommendationsforstructuresstrengthenedbyprestressedbondedfesma AT motavallimasoud analysisanddesignrecommendationsforstructuresstrengthenedbyprestressedbondedfesma AT ghafoorielyas analysisanddesignrecommendationsforstructuresstrengthenedbyprestressedbondedfesma |