For the safety evaluation and estimation of the residual bearing capacity of a cracked reactor support structure under eccentric loadings,a test was conducted on the mechanical properties of the fracture of support structure materials.Combining numerical simulation and a two-parameter failure assessment diagram(FAD)meth-od,the influences of different crack lengths and load eccentricities on the residual bearing capacity of support struc-tures are discussed.The results show that both crack length and load eccentricity have significant effects on the re-sidual bearing capacity of support structures and that the eccentricity of loads should be considered when evaluating the integrity of support structures with cracks.However,the two-parameter FAD curves of the support structure with different crack lengths had obvious differences,whereas the FAD curves under different load eccentricities had little difference.The residual bearing capacity was approximately linearly related to the crack length under axial tensile load,whereas it was nonlinear under eccentric tensile load.This work can provide a method and database for the vitality assessment of nuclear power systems.
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