Improving the Ductility of Concrete Columns through Compression Yielding

Project: Research

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The ultimate curvature of flexural members depends on the two strain values at the compression and tension sides when a failure occurs. For reinforced concrete (RC) members, the crushing of concrete governs the ultimate failure of a cross-section, because concrete is a brittle material and has a much smaller strain capacity than that of reinforcing steel. As the ultimate strain of a particular grade concrete is a certain value, the curvature capacity of an RC section depends on the tensile strain of the member at concrete crushing. Similarly, the curvature ductility depends on the extent of tensile yielding of the steel reinforcement. In RC columns, the existence of axial force reduces the strain at the tension side of the cross-section. Therefore, the deformation capacity and ductility of an RC column is usually smaller than that of an RC beam. The ductility is critical for RC columns, particularly for seismic structures to survive a major earthquake. As a result, the development of technology that can increase the ductility of RC columns is of major theoretical significance and practical importance for the design and construction of RC structures.A novel structural concept for increasing the flexural ductility of RC beams through compression yielding (CY) instead of tension yielding has recently been developed by the principal investigator. Preliminary theoretical studies and experimental investigations have demonstrated that the CY concept is highly effective in increasing the ductility of RC beams. In principle, the CY concept should be equally applicable and effective for RC columns. This proposed investigation aims at increasing the deformability and ductility of RC columns through the application of the newly developed CY technology.


Project number7002563
Grant typeSRG
Effective start/end date1/05/1018/01/12