Details
| Original language | English |
|---|---|
| Article number | 110901 |
| Journal | Thin-walled structures |
| Volume | 189 |
| Early online date | 20 Jun 2023 |
| Publication status | Published - Aug 2023 |
Abstract
This study entails the development of a non-destructive prestressed strengthening solution for steel beams using adhesively bonded memory-steel (also known as iron-based shape memory alloy, Fe-SMA) strips. The Fe-SMA strip is activated via heating and subsequent cooling to generate prestress, while the two ends of the Fe-SMA strip are adhesively bonded as anchorages. The behavior of the Fe-SMA-to-steel bonded joints was investigated through lap-shear tests, from which an effective bond length of approximately 120 mm was determined. Subsequently, a strengthening solution for a 5.3 m span steel I-beam was designed based on finite element analysis. A 4200 mm × 100 mm × 1.5 mm Fe-SMA strip was bonded to the bottom of the steel beam with a bond length of three times the effective bond length, and a two-step activation strategy using torches was proposed. Furthermore, the designed strengthening solution was experimentally tested. With activation to the target temperature of 240 °C, the Fe-SMA developed a prestress level of approximately 280 MPa. A series of static and fatigue four-point bending tests were conducted. After 3 million cycles of fatigue loading, no debonding or degradation was observed for the adhesively bonded Fe-SMA-strengthened specimen; this demonstrated the reliable performance of the strengthening solution under service loads.
Keywords
- Adhesive bonding, Fatigue, Fe-Mn-Si shape memory alloy, Memory-steel, Prestress, Rehabilitation, Steel beam
ASJC Scopus subject areas
- Engineering(all)
- Civil and Structural Engineering
- Engineering(all)
- Building and Construction
- Engineering(all)
- Mechanical Engineering
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In: Thin-walled structures, Vol. 189, 110901, 08.2023.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Strengthening of steel beams with adhesively bonded memory-steel strips
AU - Wang, Sizhe
AU - Li, Lingzhen
AU - Su, Qingtian
AU - Jiang, Xu
AU - Ghafoori, Elyas
N1 - Funding Information: Support from the Key Research Project of Guangdong Province of China ( 2019B111106002 ), the National Natural Science Foundation of China ( 52278207 ), Natural Science Foundation of Shanghai ( 21ZR1466100 ), Fundamental Research Funds for the Central Universities of China , and China Scholarship Council (CSC) is acknowledged. The authors also acknowledge the support from re-fer AG, Switzerland, to provide the Fe-SMA material, and Sika AG, Switzerland, to deliver the structural adhesive for this study. In addition, thanks are due to the technicians at the Structural Engineering Laboratory of Empa for their assistance in conducting the experiments.
PY - 2023/8
Y1 - 2023/8
N2 - This study entails the development of a non-destructive prestressed strengthening solution for steel beams using adhesively bonded memory-steel (also known as iron-based shape memory alloy, Fe-SMA) strips. The Fe-SMA strip is activated via heating and subsequent cooling to generate prestress, while the two ends of the Fe-SMA strip are adhesively bonded as anchorages. The behavior of the Fe-SMA-to-steel bonded joints was investigated through lap-shear tests, from which an effective bond length of approximately 120 mm was determined. Subsequently, a strengthening solution for a 5.3 m span steel I-beam was designed based on finite element analysis. A 4200 mm × 100 mm × 1.5 mm Fe-SMA strip was bonded to the bottom of the steel beam with a bond length of three times the effective bond length, and a two-step activation strategy using torches was proposed. Furthermore, the designed strengthening solution was experimentally tested. With activation to the target temperature of 240 °C, the Fe-SMA developed a prestress level of approximately 280 MPa. A series of static and fatigue four-point bending tests were conducted. After 3 million cycles of fatigue loading, no debonding or degradation was observed for the adhesively bonded Fe-SMA-strengthened specimen; this demonstrated the reliable performance of the strengthening solution under service loads.
AB - This study entails the development of a non-destructive prestressed strengthening solution for steel beams using adhesively bonded memory-steel (also known as iron-based shape memory alloy, Fe-SMA) strips. The Fe-SMA strip is activated via heating and subsequent cooling to generate prestress, while the two ends of the Fe-SMA strip are adhesively bonded as anchorages. The behavior of the Fe-SMA-to-steel bonded joints was investigated through lap-shear tests, from which an effective bond length of approximately 120 mm was determined. Subsequently, a strengthening solution for a 5.3 m span steel I-beam was designed based on finite element analysis. A 4200 mm × 100 mm × 1.5 mm Fe-SMA strip was bonded to the bottom of the steel beam with a bond length of three times the effective bond length, and a two-step activation strategy using torches was proposed. Furthermore, the designed strengthening solution was experimentally tested. With activation to the target temperature of 240 °C, the Fe-SMA developed a prestress level of approximately 280 MPa. A series of static and fatigue four-point bending tests were conducted. After 3 million cycles of fatigue loading, no debonding or degradation was observed for the adhesively bonded Fe-SMA-strengthened specimen; this demonstrated the reliable performance of the strengthening solution under service loads.
KW - Adhesive bonding
KW - Fatigue
KW - Fe-Mn-Si shape memory alloy
KW - Memory-steel
KW - Prestress
KW - Rehabilitation
KW - Steel beam
UR - http://www.scopus.com/inward/record.url?scp=85162178966&partnerID=8YFLogxK
U2 - 10.1016/j.tws.2023.110901
DO - 10.1016/j.tws.2023.110901
M3 - Article
AN - SCOPUS:85162178966
VL - 189
JO - Thin-walled structures
JF - Thin-walled structures
SN - 0263-8231
M1 - 110901
ER -