Durability Prediction And Evaluation Of Marine Concrete Structures

There is significant to research the durability life of marine concrete structures. Thedurability design methods of marine concrete structures are briefly introduced in the paper.Chloride transporting mechanism in marine concrete and research progress of chloridetransporting models are introduced. According to Fick’s2ndlaw that is frequently used,problems of durability parameters values and parameters reliability sensitivity areanalyzed. As to sensitivity analysis, Latin Hypercube Sampling (LHS) is used and FiniteVolume Method-Monte Carlo (FVM-MC) method that applyed to two-dimensional andmulti-dimensional marine concrete structural members is proposed firstly. On the basis ofsensitivity analysis, time series model is used to analyze chloride distribution rules inconcrete structrues. The change law of chloride content can be analyzed according to fieldmeasured data, and all the influence factors can be consided synthetically. Durabilityparameters values are simplified, and then error is reduced correspondingly. This is a newmethod of durability life prediction for marine concrete structures. The main content of thepaper is as follows:(1) Reliability sensitivity of durability parameters of Fick’s2ndlaw is analyzed, andthe influence of durability parameters on failure probability is compared. FVM-MCmethod is firstly ued to analyze reliability sensitivity of two-dimensional andmulti-dimensional marine concrete structural members.(2) Time series model is firstly proposed to predict chloride distribution in marineconcrete structures.(3) In order to prove the correctness of time series model predicting chloridedistribution, verification tests are conducted, which include rapid chloride migration test,electric accelerate penetration test and constant voltage accelerate penetration test.Chloride content with respect to time and space measured by tests is analyzed by timeseries model, and then the effectiveness of proposed method can be verifyed.