변형률국소화에 의한 콘크리트의 압축파괴 해석에 관한 연구

초록

In this paper, three dimensional compressive failure of plain concrete is analyzed by adopting the so-called homogenized crack model in finite element method. Since quasi-brittle materials like concrete show strain localization behavior accompanied by strain softening, pathological phenomenon such as mesh sensitivity is appeared in the numerical anal-ysis. Recently, regularization methods are introduced to overcome this problem. In this study, homogenized crack model which considers rate discontinuity in the constitutive equation is proposed for a cracking and its propagation in strain softening regime in concrete under compressive load. A constitutive equation of proposed crack model is derived in the general three-dimensional space and finite element analysis is carried out for the concrete under uniaxial compression. Results from the numerical analysis are compared with experimental data. The comparison shows that the mesh sensitivity in the analysis is successfully overcome and compressive failure of concrete is well simulated.

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