鉄筋コンクリート円筒殻における衝撃載荷位置の影響に関する研究

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The main purpose of this paper is to investigate, both theoretically and experimentally, the effects of impact position on reinforced concrete cylindrical shells supported by pins at the four corners. The cylindrical nonlinear dynamic behaviors and the strength of roof-type shells under one point impact were studied different impact positions on the shell surface. The theoretical study was conducted for using the nonlinear transient dynamic finite element analysis considering concrete cracking and tension stiffening effects. Twentynode iso-paremetric shell elements with the reduced integration techniques were adopted. The effects of impact position on the two different central lines of shells on the strength and the crack patterns are investigated numerically. The experimental study was conducted on reinforced micro-concrete shell specimens. Impact was applied perpendicularly on the shell surface up to the failure. The impact intensities at the first crack on shell surfaces and edge members, and cracking patterns influenced by the differences of the impact position of shell surface were discussed.