The risks are widespread and significant ambiguity,which needs reasonable evaluationto avoid the accident loss.Based on the traditional ALARP risk matrix and two-dimensional cloud theory,a risk quantitative evaluation method was proposed.Based on the fifth-order ALARP risk matrix with"probability of occurrence"and"hazard"as risk indicators,the risk index combinations corresponding to the four risk levels were calculat-ed,and the corresponding two-dimensional cloud models were established respectively.Experts,who refer to the assessment criteria of rating a risk factor,were invited to conduct multiple independent ratings of risk indica-tors,and the cloud model of risk assessment samples was established.Matlab was adopted to generate a large number of sample points based on the evaluation sample cloud parameters and to calculate the average certainty in the forward cloud generator,and then the basis for the final risk rating was obtained.Taking the risk assess-ment of stay cable durability as an example,the validity and operability of the proposed method were verified with the actual damage situation of the project.
Cloud theoryRisk assessmentAs low as reasonable practical criterionPlanar cloud modelDurability
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