繰返し風荷重を受ける鉄筋コンクリート造冷却塔の弾塑性挙動

概要

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In the present study, the elasto-plastic nonlinear behavior of a reinforced concrete cooling tower, more than 150m tall, supported at a lower lintel by columns is studied under cyclic wind loads. Based on Lattice Model for constitutive equations for concrete, the analysis considers the effects of cracks and tension stiffening due to tension, and crash due to uni and bi-axial compressions of concrete as well as yielding of reinforcement. The analysis is based on isoparametric shell elements. The concrete shell elements are divided into many layers and steel reinforcing bars are replaced as thin sheets, while the circular stiffening rings at the top and lower cornices, columns and footing ring, all being reinforced concrete, are modeled using fiber elements. In the analysis, wind loads are cyclically applied to the tower under a constant self weight, and the importance of the effects of cracking, tension stiffening and deterioration of concrete elements under cyclic loads is made clear, and a suggestion is drawn from the results that the effects of cyclic wind loads can not be negligible for assessing the stiffness and the ultimate strength of reinforced concrete cooling towers.
一般社団法人日本建築学会の論文
2007-03-20