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A platform for research: civil engineering, architecture and urbanism
Numerical investigation of seismic rehabilitation of mass concrete piers of a railway bridge using post-tensioning technique
Lightly reinforced mass concrete piers are seismically vulnerable due to their excessive weight and inadequate reinforcement. The present paper aims to outline an innovative method for seismic rehabilitation of such piers using post-tensioning technique. In the numerical case study carried out in the paper, it is shown that a prescribed compressive stress about five percent of the pier axial strength can promote the lateral load-carrying capacity by 60 percent. Moreover, the piers with originally brittle behavior show proper ductility applying adequate prescribed compression. The capability of the rehabilitated piers to reveal stable non-linearity is resulted in a minimum seismic response modification factor of 3.0, approximately. This value is comparable with unity considered for the existing piers. The nonlinear analysis conducted under cyclic loading confirms that the efficiency of this method does not considerably degrade during the loading excursions. Finally, a simplified method is proposed to estimate the amount of compression needed to achieve required strength and ductility.
Numerical investigation of seismic rehabilitation of mass concrete piers of a railway bridge using post-tensioning technique
Lightly reinforced mass concrete piers are seismically vulnerable due to their excessive weight and inadequate reinforcement. The present paper aims to outline an innovative method for seismic rehabilitation of such piers using post-tensioning technique. In the numerical case study carried out in the paper, it is shown that a prescribed compressive stress about five percent of the pier axial strength can promote the lateral load-carrying capacity by 60 percent. Moreover, the piers with originally brittle behavior show proper ductility applying adequate prescribed compression. The capability of the rehabilitated piers to reveal stable non-linearity is resulted in a minimum seismic response modification factor of 3.0, approximately. This value is comparable with unity considered for the existing piers. The nonlinear analysis conducted under cyclic loading confirms that the efficiency of this method does not considerably degrade during the loading excursions. Finally, a simplified method is proposed to estimate the amount of compression needed to achieve required strength and ductility.
Numerical investigation of seismic rehabilitation of mass concrete piers of a railway bridge using post-tensioning technique
Numerical investigation of seismic rehabilitation of mass concrete piers of a railway bridge
Moslehi Tabar, A. (author) / Rahbar, M.R. (author)
Bridge Structures ; 14 ; 147-157
2019-06-03
11 pages
Article (Journal)
Electronic Resource
English
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