Durability Evaluation Analysis Of Concrete Structures Based On Unascertainty

Today how to make an assessment of durability has become an urgent task in the research of RC structure durability. Based on the predecessors' research, unascertained mathematics theory is applied to assess the durability of RC structure.The evaluation system of RC structure durability is a complicated human-machine environment one with multifactor, multivariable and multilevel. Therefore, its durability evaluation involves a lot of uncertain information. On the basis of analysis about the advantages and disadvantages of random information, fuzzy information, grey information and unascertained information in the paper, the unascertained measure theory was applied into the structure durability evaluation and the principia of establishing an index system and the relation of the index levels were analyzed. The index system of the durability evaluation for RC structure was established according to some code and some relating paper, basing on the analysis about the structure durability system in detail. And to the appraised system of concrete structure durability the weight has been carried on the multi-analysis, the objective classified weight has been established in two appraisal levels using the information entropy theory and the subjective important weight has been established using the AHP method, scientifically causes the appraisal system the weight computation, to be reasonable. On the foundation, the unascertained measure model for the concrete structure durability overall assessment has been established. Calculates the unascertained measure value of each appraisal target using this model, again carries on the rank determination according to the confidence recognition criterion, and obtains the appraisal result. Finally through the example confirmation, the reinforced concrete structure durability of the unascertained appraisal model is effective in this article.