Damage Evaluations and Strength Deteriorations of High Strength RC Structures Containing Steel Fiber under Multi-Directional Loading

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Reinforced concrete (RC) structure is now being used in skyscraper construction in recent years, and ultra high strength concrete containing steel fiber (SF) with a compressive strength of over 100N/mm2 is being used for lower stories which are subjected to large axial forces.In this study, three-dimensional FEM analysis is performed on ultra high strength RC members containing SF under multi-directional loading. This study reproduced accurately the improving deformation performance and the increasing crack dispersion of ultra high strength RC members containing SF. This was achieved using an analytical model of the tensile stress-strain relationships of ultra high strength concrete containing SF. Moreover, stress contours, strain contours, and accumulated consumption strain energies were investigated in order to evaluate analytically the damages of ultra high strength RC members containing SF.