다축 압축응력을 받는 콘크리트의 파괴거동 해석에 관한 연구

초록

Since quasi-brittle materials like concrete show strain localization behavior accompanied by strain softening, a numerical drawback such as mesh sensitivity is appeared in the finite element analysis. In this study, a homogenized crack model which overcomes the drawback and considers rate discontinuity in the constitutive equation is proposed for modeling of cracking in concrete and its propagation in strain softening regime under compressive load. And a finite element analysis program is developed for the analysis of failure behavior of plain concrete under multi-axial compressive load by utilizing the model. The results from the numerical analysis show good agreement with experimental data. For concrete specimens under biaxial and triaxial confining pressure, it is shown that compressive failure behaviors of the concrete with softening behavior are well predicted by the finite element analysis utilizing the homogenized crack model.

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