衝撃荷重を受ける鉄筋コンクリート屋根形円筒シェルの動的非線型解析

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The main purpose of this paper is to investigate the nonlinear dynamic behaviors of reinforced concrete roof-type circular cylindrical shells stiffened with a rib under impact loading. The theoretical study is conducted using concrete cracking and tension stiffening effects. Three dimensional iso-parametric shell elements are adopted. Reduced integration is used to evaluate each element stiffness. A smeared crack model is adopted. Tension cut-off, strain-softening and reduced shear modulus are considered for concrete under tensile stresses. In this paper, no hardening is considered for concrete under compressive stresses and an exponential function is used to describe the post-failure behavior. Reinforcing bars are considered as steel layers of equivalent thickness resisting the axial force in the bar direction. In these analyses, two different types of roller supporting conditions are considered. One is four corner supports of shell and the other is two point supports of cantilever-type shell. Impact loading, which is a dynamic concentrated loading, is applied at the center of each shell surface. The results of this analysis are compared with the results for static concentrated loading in our recent experimental study. The load levels at the first cracking on shell surface and stiffening rib, such as edge beams, edge arches and a stiffening rib are investigated. The cracking patterns and the effects of both stiffening members and supporting conditions on shell surfaces are obtained.
東海大学の論文

衝撃荷重を受ける鉄筋コンクリート屋根形円筒シェルの動的非線型解析

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