TY - GEN

T1 - Strengthening of road composite bridge using Fe-SMA

AU - Vůjtěch, Jakub

AU - Ryjáček, Pavel

AU - Ghafoori, Elyas

AU - Matos, José Campos

N1 - Funding Information: The authors would like to express their gratitude to the Ministry of Culture of the Czech Republic for funding research work within the framework of the Program of Applied Research and Development of National and Cultural Identity (NAKI-II) project: Methods for achieving sustainability of industrial heritage steel bridges, ID.: DG18P02OVV033. Funding Information: The authors would like to express their gratitude to the Ministry of Cutul re of the Czech Republic for funding research work within the framework of the Program of Applied Research and Development of atN ional and Cultural Identity A(N KI-II) project: Methods for achieving sustainability of industrial heritage steel bridges, ID.: DG18P02OVV033. Publisher Copyright: © 2022 IABSE Symposium Prague, 2022: Challenges for Existing and Oncoming Structures - Report. All rights reserved.

PY - 2022

Y1 - 2022

N2 - Exceeding creep actions on newly built composite bridge in Karlovy Vary led to rapid repair works of the excessively deflected structure. Activation of retrofit prestressing system in confined places is usually a difficult task. Instead of space-demanding hydraulic actuators, prestressing system of thermally activated shape memory alloys was used under low filler beam bridge to act against the creep inflicted deflection. Method of thermal activation of Fe-SMA with use of heating ceramic pads with resistance wire was performed on all of 17 filler beams. This method was proven as most suitable for field activation in previous application. Strengthening was done in February 2021 without any intervention into the traffic on the bridge. It is the first permanent Fe-SMA application of its kind in the world. Wireless monitoring of the bridge started before the prestress activation and continued for several months. Static load test with use of 32-ton trucks was conducted. Based on the long-term monitoring, the relaxation of Fe-SMA is evaluated and compared with the results from the experimental analysis conducted in laboratory conditions on the same retrofit system.

AB - Exceeding creep actions on newly built composite bridge in Karlovy Vary led to rapid repair works of the excessively deflected structure. Activation of retrofit prestressing system in confined places is usually a difficult task. Instead of space-demanding hydraulic actuators, prestressing system of thermally activated shape memory alloys was used under low filler beam bridge to act against the creep inflicted deflection. Method of thermal activation of Fe-SMA with use of heating ceramic pads with resistance wire was performed on all of 17 filler beams. This method was proven as most suitable for field activation in previous application. Strengthening was done in February 2021 without any intervention into the traffic on the bridge. It is the first permanent Fe-SMA application of its kind in the world. Wireless monitoring of the bridge started before the prestress activation and continued for several months. Static load test with use of 32-ton trucks was conducted. Based on the long-term monitoring, the relaxation of Fe-SMA is evaluated and compared with the results from the experimental analysis conducted in laboratory conditions on the same retrofit system.

KW - Roadway bridge

KW - Shape memory alloy

KW - Strengthening

KW - Structural monitoring

KW - Sustainability

UR - http://www.scopus.com/inward/record.url?scp=85133539943&partnerID=8YFLogxK

M3 - Conference contribution

AN - SCOPUS:85133539943

T3 - IABSE Symposium Prague, 2022: Challenges for Existing and Oncoming Structures - Report

SP - 837

EP - 844

BT - IABSE Symposium Prague, 2022

T2 - IABSE Symposium Prague 2022: Challenges for Existing and Oncoming Structures

Y2 - 25 May 2022 through 27 May 2022

ER -