BEHAVIOR OF REINFORCED CONCRETE HYPERBOLIC PARABOLIC INVERTED UMBRELLA SHELL

AIJ
  • KATO Shiro
    Dept of Architecture and Civil Eng., Toyohashi Univ. of Tech.
  • SHIMAOKA Shunsuke
    Dept of Mechanical and Structural System Eng., Toyohashi Univ. of Tech.

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  • 鉄筋コンクリート造逆傘型HPシェルの変形性状

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Abstract

The present paper investigates the elasto-plastic nonlinear behavior of a reinforced concrete hyperbolic parabolic umbrella shell under self weight and prestresses based on a fmite element analysis. The finite element analysis for shells is based on isoparametric shell elements in which shell thickness is divided into many concrete layers and equivalent steel layers. The nonlinear constitutive equations for concrete layers of shell elements are based on a concept of Ring Typed Lattice Model which considers behavior of concretes under bi-axial stresses. The diagonal beams and horizontal beams for stiffening are modeled using fiber elements. In the present study, first, an elastic linear behavior under self weight and prestresses are analyzed considering the effects of the edge beams, and in-plane stress state of shell elements and effects of prestresses for the vertical displacements are investigated. Second, nonlinearity of concrete is included in analyses and the nonlinear behavior is discussed based on the elasto-plastic nonlinear analysis under vertical loads, proportional to self weight, followed by a discussion for ultimate state and deterioration of stiffness under cyclic loading.

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