| The combination of coral concrete and Steel-Fiber Composite Bar(SFCB)can solve the problem of building material shortage
and reinforcement corrosion in the construction of island and reef engineering. Studying the mechanical properties of coral concrete
structures has important engineering and practical significance for improving the theory of coral concrete structures and promoting the
research progress of coral concrete applications. The oblique section shear resistance test was carried out on 5 SFCB reinforced coral
concrete beams, the crack development process of SFCB reinforced coral concrete beams under different shear-span ratios was introduced
in detail, the effects of different shear span ratios on the failure form, longitudinal rib strain, inner core reinforcement strain and mid-span
deflection of SFCB reinforced coral concrete beams were studied, and the shear resistance of different reinforced coral concrete beams was
discussed. The experimental results show that the failure modes of beams with the same reinforcement can be divided into diagonal
compression failure, shear compression failure and diagonal tension failure under different shear span ratios, and exhibit certain ductile
failure when λ= 2. The coral aggregate inside the concrete beams are all sheared, the concrete crushing phenomenon is not obvious, and
the SFCB ribs are well bonded with the coral concrete. The development of longitudinal strain and deflection is divided into three different
stages, and the development of longitudinal rib strain is different from the center of the bending shear area and the law of spanning. The
shear performance of SFCB reinforced coral concrete beams and rebar and fiber composite reinforced coral concrete beams is obviously
different, and the application of SFCB reinforcement to coral concrete beams can exert its excellent properties. |
