Tomoya TAKAHASHI

Evaluation equations for ultimate shear capacity and allowable shear strength of SFRC shear walls were proposed, and their validity was examined using the results of previous experiments and analysis. It was confirmed that the experimental maximum shear capacity could be evaluated accurately and on the safe side by using an equation that accumulates the shear strength that steel fibers can bear to the shear capacity equation (truss-arch mechanism) for RC shear walls. In addition, it was confirmed that the experimental maximum capacity could be simulated using a finite element analysis model that simplified the SFRC material properties.

In-plane cyclic loading tests were performed to examine the flexural properties of SFRC walls. The test results revealed that steel fiber reinforcement mitigated damage to the walls and enhanced deformation performance. Steel fibers also increase both flexural and shear capacities and suppress shear stiffness degradation after shear cracking. By taking these factors into account, skeleton curves that fit experimental results were obtained. SFRC specimen with 0.30% wall reinforcement and shear to flexural capacity ratio of 1.00 showed superior deformation performance than RC specimen with 1.13% reinforcement and the ratio of 1.14. SFRC increases the toughness performance of walls.

Concrete short-span beams might suffer bond splitting failure during a large earthquake due to their short development length. Steel Fiber-Reinforced Concrete is known to be effective in enhancing the performance of concrete members. However, there are not many studies on bond splitting failure of Steel Fiber-Reinforced Concrete members. Therefore, we carried out bond splitting tests of Steel FiberReinforced Concrete assuming corner and side split type failures. We proposed an evaluation method for bond splitting strength considering their material properties. In addition, the evaluation method was verified using the results of tests of short-span Steel FiberReinforced Concrete beams.