Experimental study on ultimate bearing capacity of BFRP reinforced fiber shotcrete flexural members

The water conveyance tunnel is an important structural form in the allocation of water resources. The corrosion of the steel bars in the concrete lining makes it difficult to reach the required useful life. In order to solve the adverse effect of reinforcement corrosion on the durability of the concrete lining structure of water conveyance tunnel, BFRP reinforcement is proposed in shotcrete lining instead of steel reinforcement. In this paper, the ultimate bearing capacity of BFRP reinforced fiber shotcrete flexural members are studied through experiments. The results show that the flexural failure modes of BFRP reinforced fiber shotcrete flexural members can be divided into three types: under-reinforced, ideally reinforced and over-reinforced. Basalt fiber can ensure the integrity of beams in failure. The ultimate flexural bearing capacity of beams increases with the increment of BFRP reinforcement ratio. Under the same reinforcement ratio, the flexural ultimate bearing capacity of high content basalt fiber specimens is higher than that of low content basalt fiber specimens while the difference is small. In this paper, a calculation method of normal section bearing capacity of fiber shotcrete flexural members with BFRP reinforcement is proposed.