China Safety Science Journal ›› 2018, Vol. 28 ›› Issue (10): 162-168.doi: 10.16265/j.cnki.issn1003-3033.2018.10.027

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Study on concrete beam bridge bearing capacitycomprehensive evaluation system

LONG Guanxu1, LIU Xiuping1, TANG Longlong2, WANG Tao1, HUANG Pingming1   

  1. 1 School of Highway, Chang'an University, Xi'an Shaanxi 710064, China
    2 First Harbor Consulatants Co.,Ltd, China Communications Construction, Tianjin 300222, China
  • Received:2018-07-10 Revised:2018-08-25 Online:2018-10-28 Published:2020-11-20

Abstract: Six main factors, including average corrosion potential, chloride ion content, carbonation depth, average crack width, concrete section loss rate and concrete measured strength value were selected as the research object, the influencing factors were classified based on the fuzzy mathematics theory by non-deterministic AHP, and then the fuzzy relation matrix of each factor was established. The improved real genetic algorithm was used to determine the optimal weight of each factor to calculate the bearing capacity comprehensive reduction factor, and a comprehensive evaluation system of bearing capacity was established. Ten experimental beams with different damages were utilized to carry out destructive tests to verify the effectiveness of the comprehensive evaluation system. The results indicate that compared with the standard bearing capacity evaluation method, the reduction coefficient calculated by the comprehensive evaluation system is closer to the measured,and the results are conservative, which is more conducive to the assessment of the bearing capacity of the existing concrete beam bridges.

Key words: existing concrete beam bridge, bearing capacity, comprehensive evaluation, multi-level fuzzy theory, uncertain analytic hierarchy process(AHP), destructive test

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