Your browser doesn't support javascript.
loading
Monitoring and Analysis of Prestress Loss in Prestressed Box Girder Bridges Strengthened with External Prestressing.
Guo, Haoran; Yang, Jing; Tang, Renjie; Yang, Caiqian; Xu, Fu.
Afiliación
  • Guo H; College of Civil Engineering, Xiangtan University, Xiangtan 411105, China.
  • Yang J; College of Architectural Science and Engineering, Yangzhou University, Yangzhou 225127, China.
  • Tang R; College of Civil Engineering, Xiangtan University, Xiangtan 411105, China.
  • Yang C; School of Civil Engineering, Southeast University, Nanjing 210096, China.
  • Xu F; College of Civil Engineering, Xiangtan University, Xiangtan 411105, China.
Sensors (Basel) ; 24(14)2024 Jul 13.
Article en En | MEDLINE | ID: mdl-39065947
ABSTRACT
To investigate the effects of long-term prestress loss on concrete box girders strengthened with external prestressing, a large-span box girder, in service for over 20 years and strengthened with external prestressing, was monitored for four months. Prestress loss in the longitudinal, vertical, and transverse directions of the box girder was calculated according to Chinese code requirements. Magnetic flux rope force transducers were used to monitor the prestress loss in the external prestressing cables. Fiber Bragg Grating (FBG) sensors were used to monitor deflection changes at the mid-span of the bridge. Finally, the effect of prestress loss in the longitudinal, vertical, and transverse tendons on mid-span deflection was investigated through simulations using ABAQUS software. The results show that instantaneous prestress loss accounts for most of the total loss compared to long-term loss, and that longitudinal prestress loss has the most significant effect on mid-span deflection. The impact of longitudinal prestress loss on deflection before and after strengthening was also compared. The downward deflection and up-ward arch caused by longitudinal tendon prestress loss were reduced after strengthening, con-firming the effectiveness of the external prestressing method.
Palabras clave
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Sensors (Basel) Año: 2024 Tipo del documento: Article País de afiliación: China Pais de publicación: Suiza
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Sensors (Basel) Año: 2024 Tipo del documento: Article País de afiliación: China Pais de publicación: Suiza