PC鋼棒にプレストレスを導入し外部横補強した鉄筋コンクリート柱の繰返し曲げ性状

概要

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From the view point of preventing the severe disaster by large earthquakes, seismic retrofit of the brittle buildings is efficient approach. A method to improve the ductility of Reinforced Concrete (RC) structure was addressed in this paper. Test and analysis were conducted for investigating the hysteritic behavior of RC columns retrofitted by PC bars externally. An experimental study was carried out on the five normal RC specimens and the eight specimens retrofitted by PC bars to estimate the effect of this retrofiting method. In this study, two types of retrofiting by PC bars are compared. One is PC bars with non-prestressing, the other is PC bars with prestressing. The feature of the latter method is active confining effect for the concrete. The load-deformation hystereses of the test specimens can be predicted by the fiber-based analysis method using the available stress-strain curve models for the confined concrete.
2009-03-27