A Study On Diagonal Compressive Force Transmission Mechanism through Concrete of RC Column

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1. The maximum compressive force transmitted diagonally from the top to the bottom through the concrete of RC column was clarified. RC column specimens were made and tested. The rebars of the specimen were high strength PC bars and the bond between rebars and concrete was eliminated.2. RC column specimens were made and tested under compression-shear-bending. Shear force and compressive force were varied. Bending moment was proportional to shear force. Relation among compressive force, shear force, axial deformation and horizontal deformation of RC column was examined.3. Tri-axial non-linear restoring force characteristic of RC column was formulated using the analogy to the theory of plasticity. Relation between axial deformation and horizontal deformation of RC column can be described by proposed restoring force characteristic model. The proposed tri-axial non-linear restoring force model can describe well the total behaviors of RC column subjected to three -dimensional deformation history.4. Response of RC structure to three dimensional earthquake motions was analyzed using the tri-axial non-linear-restoring force characteristic of RC columns. As a result, it is found that one-dimensional non-linear response analysis has a possibility to underestimate the maximum deformation of RC structure due to three-dimensional ground motions.