Details
| Original language | English |
|---|---|
| Title of host publication | IABSE Symposium, Guimaraes 2019 |
| Subtitle of host publication | Towards a Resilient Built Environment Risk and Asset Management - Report |
| Pages | 1528-1535 |
| Number of pages | 8 |
| ISBN (electronic) | 9783857481635 |
| Publication status | Published - 2019 |
| Externally published | Yes |
| Event | IABSE Symposium 2019 Guimaraes: Towards a Resilient Built Environment - Risk and Asset Management - Guimaraes, Portugal Duration: 27 Mar 2019 → 29 Mar 2019 |
Publication series
| Name | IABSE Symposium, Guimaraes 2019: Towards a Resilient Built Environment Risk and Asset Management - Report |
|---|
Abstract
The current study presents a retrofit system, which can be used for strengthening of steel bridge beams using (un-bonded) mechanically-anchored iron-based shape memory alloy (Fe-SMA, ‘memory-steel’) strips. After anchoring, the Fe-SMA strips are activated by a heating and a subsequent cooling process. The anchorage system can simultaneously hold two strips (each with 50-mm width and 1.5-mm thickness) and transfer their prestressing force to the steel beam at the strip ends. The system is based on friction and does not introduce any damage to the parent metallic substrate. Owing to the so-called ‘shape memory effect’ (SME) of the alloy, the strips are prestressed after activation by heating up to a defined maximum temperature. After strengthening, the beam was statically loaded up to 60% of its yield capacity. Finally, in order to examine efficiency of the proposed SMA-strengthening solution, the steel beam was subjected to cyclic loading. The results of the static tests demonstrated the positive effects of the prestressed Fe-SMA strips on reducing tensile stresses in the beam bottom flange. Furthermore, the evolution of the prestress level in the strips during the fatigue loading was studied. The presented experimental study on the strengthened steel beam shows the effectiveness of un-bonded Fe-SMA strips as a retrofitting technique to enhance the static and fatigue performance of metallic bridge girders.
Keywords
- Activation, High cycle fatigue (HCF), Iron-based shape memory alloy (Fe-SMA), Prestressed strengthening, Shape memory effect (SME), Steel structures
ASJC Scopus subject areas
- Engineering(all)
- Civil and Structural Engineering
- Engineering(all)
- Building and Construction
Cite this
- Standard
- Harvard
- Apa
- Vancouver
- BibTeX
- RIS
IABSE Symposium, Guimaraes 2019: Towards a Resilient Built Environment Risk and Asset Management - Report. 2019. p. 1528-1535 (IABSE Symposium, Guimaraes 2019: Towards a Resilient Built Environment Risk and Asset Management - Report).
Research output: Chapter in book/report/conference proceeding › Conference contribution › Research › peer review
}
TY - GEN
T1 - Strengthening of steel beams using iron-based shape memory alloy (Fe-SMA) strips
AU - Izadi, Mohammadreza
AU - Ghafoori, Elyas
AU - Hosseini, Ardalan
AU - Michels, Julien
AU - Motavalli, Masoud
N1 - Publisher Copyright: © 2019 IABSE. All rights reserved.
PY - 2019
Y1 - 2019
N2 - The current study presents a retrofit system, which can be used for strengthening of steel bridge beams using (un-bonded) mechanically-anchored iron-based shape memory alloy (Fe-SMA, ‘memory-steel’) strips. After anchoring, the Fe-SMA strips are activated by a heating and a subsequent cooling process. The anchorage system can simultaneously hold two strips (each with 50-mm width and 1.5-mm thickness) and transfer their prestressing force to the steel beam at the strip ends. The system is based on friction and does not introduce any damage to the parent metallic substrate. Owing to the so-called ‘shape memory effect’ (SME) of the alloy, the strips are prestressed after activation by heating up to a defined maximum temperature. After strengthening, the beam was statically loaded up to 60% of its yield capacity. Finally, in order to examine efficiency of the proposed SMA-strengthening solution, the steel beam was subjected to cyclic loading. The results of the static tests demonstrated the positive effects of the prestressed Fe-SMA strips on reducing tensile stresses in the beam bottom flange. Furthermore, the evolution of the prestress level in the strips during the fatigue loading was studied. The presented experimental study on the strengthened steel beam shows the effectiveness of un-bonded Fe-SMA strips as a retrofitting technique to enhance the static and fatigue performance of metallic bridge girders.
AB - The current study presents a retrofit system, which can be used for strengthening of steel bridge beams using (un-bonded) mechanically-anchored iron-based shape memory alloy (Fe-SMA, ‘memory-steel’) strips. After anchoring, the Fe-SMA strips are activated by a heating and a subsequent cooling process. The anchorage system can simultaneously hold two strips (each with 50-mm width and 1.5-mm thickness) and transfer their prestressing force to the steel beam at the strip ends. The system is based on friction and does not introduce any damage to the parent metallic substrate. Owing to the so-called ‘shape memory effect’ (SME) of the alloy, the strips are prestressed after activation by heating up to a defined maximum temperature. After strengthening, the beam was statically loaded up to 60% of its yield capacity. Finally, in order to examine efficiency of the proposed SMA-strengthening solution, the steel beam was subjected to cyclic loading. The results of the static tests demonstrated the positive effects of the prestressed Fe-SMA strips on reducing tensile stresses in the beam bottom flange. Furthermore, the evolution of the prestress level in the strips during the fatigue loading was studied. The presented experimental study on the strengthened steel beam shows the effectiveness of un-bonded Fe-SMA strips as a retrofitting technique to enhance the static and fatigue performance of metallic bridge girders.
KW - Activation
KW - High cycle fatigue (HCF)
KW - Iron-based shape memory alloy (Fe-SMA)
KW - Prestressed strengthening
KW - Shape memory effect (SME)
KW - Steel structures
UR - http://www.scopus.com/inward/record.url?scp=85065336122&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:85065336122
T3 - IABSE Symposium, Guimaraes 2019: Towards a Resilient Built Environment Risk and Asset Management - Report
SP - 1528
EP - 1535
BT - IABSE Symposium, Guimaraes 2019
T2 - IABSE Symposium 2019 Guimaraes: Towards a Resilient Built Environment - Risk and Asset Management
Y2 - 27 March 2019 through 29 March 2019
ER -