複合炭素繊維補強コンクリート造円筒殻の耐力,破壊形態及び振動特性 : 集中荷重による破壊実験に対する検討

Abstract

The main purpose of this study is to investigate the strength and the relationships among strength, cracking pattern and vibratory characteristics of concrete cylindrical shells with composite carbon fiber reinforcement under concentrated load. Composite carbon fiber reinforcement is defined as composite reinforcement consisting of carbon fiber chips and sheets, which could improve the tensile strength of a concrete within the inner body and on the boundary surface, respectively. A fractural experimental study was conducted on concrete shells reinforced with composite carbon fiber under concentrated load. Before and after the fractural experiment, vibratory tests by an impact hammer were conducted. The relationships among strength, cracking pattern and vibratory characteristics distilled from perfect model before the experiment and from damaged model after the same experiment were derived. In order to investigate the shell strength, a numerical study was conducted by material and geometrical nonlinear finite element analyses including tension cutoff and tension stiffening effects. The relationships among the strength, cracking pattern and vibratory characteristics of the shell with composite carbon fiber reinforcement were discussed on the basis of the results of the fractural experiments with before and after vibratory tests.