An anti-shear reliability assessment method for RC columns subjected to falling rock impact was established here.The 60 impact force-time histories were generated with the nonlinear finite element analysis based on the reliability verification of the numerical analysis method.A simplified model of rock impact load considering the equal peak value of impact load and the equal impulse was built to be a half wave sine one.A reliability analysis procedure considering both the shear resistance uncertainty and impact effect indefiniteness was proposed to obtain the failure probability of RC columns under different impact intensities.The
effects of rock mass,impact velocity,transverse reinforcement ratio and concrete strength on the shear vulnerability of the columns were analyzed with a parametric analysis.The analysis results showed that the parameters in the proposed model can effectively be used to simulate the dynamic responses of RC columns under low velocity impact; the peak value equivalent static load is recommended to measure the falling rock impact load; furthermore,the failure probability of RC columns at each damage level increases with increase in of rock mass and impact velocity; the increase in concrete strength,cross-section area and stirrup radio can reduce the failure probability of RC columns at each damage level to a certain extent.
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