Aiming at the structural application of ultra-high-strength synthetic fiber reinforced concrete (PVA-UFC), which can reduce the weight and extend the service life of structures, a trial design of a superstructure was conducted assuming the replacement of an actual bridge, and the performance was confirmed through loading tests on the test-designed girder. High-strength steel bars were used for the main bars, and the limit value was set higher than usual. However, the crack width remained within a range that poses no durability issues owing to the crack suppression effect of the fibers.

This paper investigates the capacity curves for the structural design of reinforced concrete (RC) columns with wing walls. This RC column with wing walls is characterized by joints without reinforcement between the column and wing walls, and horizontal slits at the bottom of the wing walls. In evaluating the initial stiffness, stiffness decreasing rate, and rigid zone, the influence of the horizontal slits can be disregarded due to their minimal impact on the results. The flexural ultimate strength is determined by summing the ultimate bending moments of both the column and the wing wall at their upper end, and the ultimate bending moment of the column at its base. The findings from this study enable the establishment of an appropriate capacity curve for structural design.