Study on Strength of Concrete Circular Cylindrical Shells under Impact Line Load

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The main purpose of this paper is to investigate both theoretically and experimentally, the strength of concrete roof-type circular cylindrical shells supported by pins at the four corners under impact line load. Difference of strength and dynamic nonlinear behaviors between two shell materials. i. e., general steel reinforced concrete and concrete reinforced by carbon fiber chips, was also investigated. The parameters of the impact line load are line load directions, line load length and load density patterms. Two kinds of line load directions were investigated, i. e., parallel to the straight line of the shell generatrix and parallel to the circular curve of shell directrix. The theoretical study was conducted using nonlinear transient dynamic finite element analyses considering concrete cracking and tension stiffening effects. Twenty-node iso-parametric shell elements were adopted with the reduced integration techniques. The experimental study was conducted steel reinforced and carbon fiber reinforced micro-concrete shell specimens. Impact line load was applied perpendicularly onto the shell surface with increasing loads up to the failure. The ultimate strength and the dynamic nonlinear behaviors of shells with each impact line load parameters are discussed based on the results of the anlaysis and experiments.
東海大学の論文