Abstract
A damper made of coiled steel is often used for base isolation systems of buildings. Since large relative displacements occur at the isolation system, large deformation elastic-plastic analysis is necessary in the designing of the damper. In this paper a method of the analysis using the degenerated beam element is presented. A simple uniaxial constitutive equation that can be used in cyclic loadings is proposed. The equation uses a bilinear function for a skeleton curve and the Ramberg-Osgood functions for hysteresis curves. A simple method for the modeling of slips at boundaries of the damper is also proposed. A method for evaluating parameters of the constitutive equation and the model of the slip is shown. With the use of the identified parameters, the results obtained by the analyses agreed well with those of experiments.
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