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A New macro element of reinforced concrete beam-column joint for elasto-plastic plane frame analysis
Tajiri, Seitaro; Shiohara, Hitoshi; Kusuhara, Fumio
Oakland, CA : Earthquake Engineering Research Institute, 100th Anniversary Earthquake Conference, "Managing Risk in Earthquake Country," San Francisco, California, April 18-22, 2006, 2006-04, PDF (CF120)
This paper proposes a new macro element for the modeling of a reinforced concrete beam-column joints in elasto-plastic plane frame analysis. The macro element defines the nonlinear constitutive relationship between four nodes, each having three degrees of freedom, i.e. two translational displacements and one rotation. The macro element consists of axial springs representing concrete, reinforcement or bond slip behavior considering the material non-linearity under reversed cyclic loading. The material models and the element stiffness matrix are introduced. The parameters of the macro element are chosen based on the dimensions, geometry and material properties of the beam-column joint. The nonlinear cyclic response of beam-column joint subassemblages subjected to lateral loading is calculated with the proposed element. The validity of the new macro element is verified by comparing the computed overall load-deflection relationship with measured data. It is shown that the element reproduces the different types of hysteretic behavior of load-deformation relationships experimentally observed, which vary significantly from fat to pinched shapes, depending on the bond-slip parameters of beam-column joints.
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