Three 36-year-old beams are taken as research objects to estimate the fluctuation scale θ of structural dimensions and material property parameters of reinforced concrete structures in service. First, the protective layer thickness C d and the concrete compressive strength f c of service bridge components are measured, and the ordinary kriging method is used to interpolate the measured data and gather effective data. Second, the θ values of C d and f c are estimated by two methods, namely autocorrelation function (ACF) and semivariogram function (SVF). Thereafter, the spatial distribution of R of each corroded steel bar is studied on the basis of measured values of the pitting factor R at different positions of 246 corroded steel bars. On the basis of one-dimensional random field theory, each beam is discretized into several small elements. According to the fluctuation scale obtained by different estimation methods, the random variables are transformed into spatial correlation variables, and the parameters of each discrete element are obtained. Then the bending capacity of each discrete beam element and the corresponding whole beam are obtained on the basis of the value of parameters of each discrete element. Finally, the two estimation methods are compared and analyzed by comparing the theoretical moment value and the bearing capacity test results of the corroded beams. Results show that the mean values of θ of f c and C d obtained by the SVF method are 2.242 and 2.467, respectively, which are larger than that obtained by the ACF method. Moreover, the fluctuation intensity of concrete compressive strength is smaller with an increase of θ value, and no firm correlation is identified between the spatial distributions of each pit on the surface of a corroded steel reinforcement. The bending moments of three beams from the SVF method are in better agreement with the experimental values than those predicted from the ACF method. In addition, the average relative error of the theoretical bending moment value of all beams based on the SVF estimation is 6.52%, which is 33.19% lower than that obtained by ACF method. Therefore, the SVF method is more effective in describing the spatial properties of material and geometrical parameters compared with the ACF method.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Random Field Parameter Estimation of Service Bridge Component and Comparative Analysis of Estimation Methods


    Contributors:


    Publication date :

    2019-03-01


    Size :

    122019-01-01 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    Unknown



    Bridge service life estimation considering inspection reliability

    Jeong, Yoseok / Kim, WooSeok / Lee, Ilkeun et al. | Online Contents | 2017


    Service life estimation of concrete bridge decks

    Hong, Tae-Hoon / Chung, Seung-Hyun / Han, Seung-Woo et al. | Springer Verlag | 2006


    Bridge service life estimation considering inspection reliability

    Jeong, Yoseok / Kim, WooSeok / Lee, Ilkeun et al. | Springer Verlag | 2016


    PARAMETER ESTIMATION DEVICE, PARAMETER ESTIMATION METHOD AND COMPUTER PROGRAM

    HATANAKA MIDORI / TAKECHI HIROAKI / KATAOKA TOMOMI | European Patent Office | 2020

    Free access

    Battery parameter estimation

    LEE TAE-KYUNG | European Patent Office | 2015

    Free access