Strength of Carbon Fiber Chip Reinforced Concrete Lop-Sided Spherical Shells

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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 lop-sided spherical shells under point load. The strength of concrete shells under not simple conditions, especially in the cases of irregular boundary, free-form shape and partial load, are hardly estimated if the nonlinear numerical method is simply applied. In this paper, the strength of a lop-sided spherical shell with the irregular boundary and shell shape made by cutting a spherical cap shell along three different intersecting curves were investigated. The strength for shells was evaluated with the nonlinear numerical analyses based on the failure experiments. Furthermore CFCRC concrete shell strength was also compared to the concrete shell strength without reinforcing. The experimental study was conducted on small scaled shell specimens, which were made of carbon fiber chip reinforced concrete (CFCRC) with mixed-in carbon fiber chips and without steel bar reinforcing. Even a complicated shell form could be constructed easily by applying CFCRC materials, because this materials could be conformed smoothly to any curved shells and irregularly curved boundaries. The theoretical study was conducted using the non-linear finite element analyses including concrete cracking and tension stiffening effects. The ultimate strength and the cracking patterns of shells are discussed based on the results of the failure experiments and numerical analysis.
東海大学の論文

Strength of Carbon Fiber Chip Reinforced Concrete Lop-Sided Spherical Shells

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