POST-PEAK AND STRAIN-SOFTENING BEHAVIORS OF CONCRETE MATERIALS IN COMPRESSION UNDER RAPID LOADING

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  • 急速-軸圧縮載荷を受けるコンクリートのポストピーク挙動に関する実験的研究
  • 急速一軸圧縮載荷を受けるコンクリートのポストピーク挙動に関する実験的研究
  • キュウソク 1ジク アッシュクサイカ オ ウケル コンクリート ノ ポストピーク キョドウ ニ カンスル ジッケンテキ ケンキュウ

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Abstract

The results of compressive rapid loading tests and many studies related on the dynamic compressive properties of concrete have been reported. However, the strain softening behaviors of concrete material under uniaxial compressive rapid loading has been left unsolved. This may be the reason that it is difficult to measure the post-peak behaviors of plain concrete since the fracture of the test specimen will happen suddenly and instantaneously under rapid loading. Thus, the methods of measuring overall deformation of the specimen is presented in this study. Also, this study is to investigate the strain softening behaviors of concrete material in compression under rapid loadings. The length of specimen, the constriction of both ends of specimen and the loading-rate are chosen as test parameters. From tests results, the effects of these parameters on the peak stress, the strain at the maximum stress, the stress softening behaviors and the strain localization are examined. Furthermore, based on the concept of the fracture energy, a set of formulations of the uniaxial compressive stress-strain relationship in the fracture zone is proposed.

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