Strength of Carbon Fiber Chip Reinforced Concrete Circular Cylindrical Shells with Openings under Impact Load

概要

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The main purpose of this paper is to investigate both experimentally and theoretically, the strength of carbon fiber chip reinforced concrete (CFCRC) roof-type circular cylindrical shells with openings under impact load. The shells were made by concrete reinforced with mixed-in carbon fiber chips and without steel reinforcing bars, and therefore show higher adaptability for any curved or irregularly shaped shell surfaces and boundaries compared to the steel bar reinforced concrete shells. In this paper, the influences of both the opening within the shell surface and the impact line load on shell strength were investigated by means of the failure experiment and the nonlinear numerical analyses. Impact line load direction parallel to the circular curve of the shell directrix was adopted. The parameters of the impact line load are line load length and load density patterns. The experimental failure study was conducted on small scale carbon fiber chip reinforced concrete shell specimens. Impact line load was applied perpendicularly onto the shell surface. The theoretical study was conducted using nonlinear transient dynamic finite element analyses with twentynode iso-parametric shell elements. The CFCRC shell strength and the cracking patterns around the openings under impact load are discussed based on the results of the experiments and analyses.
東海大学の論文