A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Strengthening of steel beams with adhesively bonded memory-steel strips
https://orcid.org/0000-0002-9966-9630
https://orcid.org/0000-0001-8887-4498
https://orcid.org/0000-0003-3296-5061
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.
Highlights Development of a non-destructive prestressed strengthening solution using memory-steel (Fe-SMA) strips and structural adhesives. Lap-shear tests of Fe-SMA-to-steel bonded joints with different surface preparations. Design of bonded joints and activation strategy based on finite element analysis. Static and fatigue tests of steel beams strengthened with adhesively bonded Fe-SMA strips. Estimation of Fe-SMA prestress using finite element simulations, analytical calculations, and the three-point bending method.
Strengthening of steel beams with adhesively bonded memory-steel strips
https://orcid.org/0000-0002-9966-9630
https://orcid.org/0000-0001-8887-4498
https://orcid.org/0000-0003-3296-5061
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.
Highlights Development of a non-destructive prestressed strengthening solution using memory-steel (Fe-SMA) strips and structural adhesives. Lap-shear tests of Fe-SMA-to-steel bonded joints with different surface preparations. Design of bonded joints and activation strategy based on finite element analysis. Static and fatigue tests of steel beams strengthened with adhesively bonded Fe-SMA strips. Estimation of Fe-SMA prestress using finite element simulations, analytical calculations, and the three-point bending method.
Strengthening of steel beams with adhesively bonded memory-steel strips
https://orcid.org/0000-0002-9966-9630
https://orcid.org/0000-0001-8887-4498
https://orcid.org/0000-0003-3296-5061
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.
Highlights Development of a non-destructive prestressed strengthening solution using memory-steel (Fe-SMA) strips and structural adhesives. Lap-shear tests of Fe-SMA-to-steel bonded joints with different surface preparations. Design of bonded joints and activation strategy based on finite element analysis. Static and fatigue tests of steel beams strengthened with adhesively bonded Fe-SMA strips. Estimation of Fe-SMA prestress using finite element simulations, analytical calculations, and the three-point bending method.
Strengthening of steel beams with adhesively bonded memory-steel strips
Wang, Sizhe (author) / Li, Lingzhen (author) / Su, Qingtian (author) / Jiang, Xu (author) / Ghafoori, Elyas (author)
Thin-Walled Structures ; 189
2023-05-23
Article (Journal)
Electronic Resource
English
Adhesively bonded hybrid steel-glass beams
| Tema Archive | 2010
Shear strengthening effect by bonded GFRP strips and transverse steel on RC T-beams
| British Library Online Contents | 2013