A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Long-term monitoring on external tendon post-tensioned box girder bridges by utilizing EM sensory technology
Maintenance of the huge stock of infrastructures is one of the major concerns in the developed countries in this century. Structure Health Monitoring System development, such as, evaluation of the field condition of existing structures and to monitor the important engineering properties of new structures, can be considered as the first step in resolving of the structural performance assessment problem. The Elasto-Magnetic (EM) sensory technology is a simple nondestructive evaluation technique for monitoring actual stress in steel cables based on observation in magnetic permeability respect to stress change. This paper discusses about the application of EM sensory technology on Kamikazue viaduct which is double box external tendon post-tensioned bridge. The field-verification items are summarized as (i)measuring friction coefficient between external PC tendon and deviator; (ii)pre-stressing control during construction; and (iii)long-term structural health monitoring on external tendon PC bridge. Furthermore, in order to verify EM sensory technology in measuring actual stress of cable in existing structure, site-fabricated EM sensors were installed as well. By observing some comprehensive results, it is confirmed that EM sensory technology is reliable for long term monitoring on PC structures. Furthermore, the stress loss due to set-loss at fixation stage, relaxation, creep and shrinkage, and concrete elastic deformation effect are clearly investigated.
Long-term monitoring on external tendon post-tensioned box girder bridges by utilizing EM sensory technology
Maintenance of the huge stock of infrastructures is one of the major concerns in the developed countries in this century. Structure Health Monitoring System development, such as, evaluation of the field condition of existing structures and to monitor the important engineering properties of new structures, can be considered as the first step in resolving of the structural performance assessment problem. The Elasto-Magnetic (EM) sensory technology is a simple nondestructive evaluation technique for monitoring actual stress in steel cables based on observation in magnetic permeability respect to stress change. This paper discusses about the application of EM sensory technology on Kamikazue viaduct which is double box external tendon post-tensioned bridge. The field-verification items are summarized as (i)measuring friction coefficient between external PC tendon and deviator; (ii)pre-stressing control during construction; and (iii)long-term structural health monitoring on external tendon PC bridge. Furthermore, in order to verify EM sensory technology in measuring actual stress of cable in existing structure, site-fabricated EM sensors were installed as well. By observing some comprehensive results, it is confirmed that EM sensory technology is reliable for long term monitoring on PC structures. Furthermore, the stress loss due to set-loss at fixation stage, relaxation, creep and shrinkage, and concrete elastic deformation effect are clearly investigated.
Long-term monitoring on external tendon post-tensioned box girder bridges by utilizing EM sensory technology
Langzeitüberwachung von extern nachgespannten Trägerbrücken mittels elastomagnetischer Sensortechnik
Sakai, H. (author) / Uesugi, T. (author) / Yasumori, H. (author) / Sumitro, S. (author) / Wang, M.L. (author)
2004
8 Seiten, 16 Bilder, 8 Quellen
(nicht paginiert)
Conference paper
Storage medium
English
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