Fourteen HRB 500 reinforced RPC beams worked on concentrated load were tested. The influence of shear span ratio, steel fiber content, stirrup ratio, reinforcement ratio, and reinforcement strength was considered. The shear capacity formula and its simplified form based on the plastic theory were concluded. The shear capacity values of the beams were predicted and compared with the test values and the results of current codes. The results show that by using the formulas based on the plastic theory, the shear capacity of RPC beams can be well predicted. The results of the simplified formula are not very discrete which is suitable for engineering. The results of current codes are all conservative. But the ideas of material strength correction in CECS 382004 are worth learning.