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http://dx.doi.org/10.5000/EESK.2003.7.5.047

A Modified Parallel Iwan Model for Cyclic Hardening Behavior of Sand(I) : Model Development  

이진선 (삼성물산 건설부문)
김동수 (한국과학기술원 건설및환경공학과)
Publication Information
Journal of the Earthquake Engineering Society of Korea / v.7, no.5, 2003 , pp. 47-56 More about this Journal
Abstract
In this paper, the cyclic soil behavior model. which can accommodate the cyclic hardening, was developed by modifying the original parallel IWAN model. In order to consider the irrecoverable plastic strain of soil. the cyclic threshold strain, above which the backbone curve deviates from the original curve, was defined and the accumulated strain was determined by summation of the strains above the cyclic threshold in the stress-strain curve with applying Masing rule on unloading and reloading curves. The isotropic hardening elements are attached to the original parallel IWAN model and the slip stresses in the isotropic hardening elements are shown to increase according to the hardening functions. The hardening functions have a single parameter to account for the cyclic hardening and are defined by the symmetric limit cyclic loading test in forms of accumulated shear strain. The model development procedures are included in this paper and the verifications of developed model are discussed in the companion paper.
Keywords
cyclic hardening; irrecoverable strain; Masing rule; IWAN model; accumulated strain;
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