Abstract
The purpose of this research is to develop a repair technique for hollow-bridge columns that have failed, due to fracturing or buckling of longitudinal rebars, so that bridge function can be quickly restored after earthquakes. In order to validate the proposed technique, two full size and three scaled-down hollow bridge columns, which had previously failed under tests conducted in conjunction with other projects, were repaired using the proposed technique and subsequently retested. To restore the column's flexural strength, the fractured longitudinal bars were replaced with dog-bone shaped bars. In addition, a steel jacket was emplaced in the plastic hinge region in order to enhance the deformation capacity of the repaired columns. Test results showed that the damaged columns could be repaired within three days, effecting a 90% restoration of the original column's flexural strength and a comparable degree of restoration of ultimate displacement to the original columns. However, it was also found that there was only a 50% recovery of the column's original stiffness and ductility.
Résumé
L'objectif de ce travail de recherche est de développer une technique de réparation pour des colonnes de pont en profiles creux qui n'ont pas résisté en raison de la rupture ou de la déformation des barres d'armature longitudinales, de sorte que la fonction de pont puisse être rapidement restaurée après des tremblements de terre. Afin de valider la technique proposée, deux colonnes de pont creuses de taille normale et trois autres à échelle réduite, qui n'avaient résisté précédemment lors d'essais conduits en même temps que d'autres projets, ont été réparées en utilisant la technique proposée et ensuite testées de nouveau. Pour reconstituer la force en flexion de la colonne, les barres longitudinales ayant subi la rupture ont été remplacées par des barres en forme d'os à moelle. En outre, une structure en acier a été placée dans la région de la charnière plastique afin d'augmenter la capacité de déformation des colonnes réparées. Les résultats des essais ont prouvé que les colonnes endommagées pouvaient être réparées en l'espace de trois jours, en effectuant une restauration à 90% de la force en flexion de la colonne originale et à un degré de restauration de déplacement final comparable aux colonnes originales. Cependant, on a également constaté qu'il n'y avait qu'un rétablissement de 50% de la rigidité originale et de la ductilité de la colonne.
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Cheng, C.T., Yeh, Y.K. & Mo, Y.L. Flexural repair of hollow rectangular bridge columns failed due to earthquake-type loading. Mat. Struct. 37, 717–723 (2004). https://doi.org/10.1007/BF02480517
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DOI: https://doi.org/10.1007/BF02480517