The Fuzzy-random Evaluation Of The Serviceability State Of Disease Prestressed Concrete Bridge

In evaluating serviceability limit state of deficient prestressed concrete bridge, uncertainty of all kinds of factors has an important influence to the evaluation results. The evaluation methods of serviceability limit state of deficient prestressed concrete bridge are discussed in the paper, focusing on how to think about the influence of uncertainty of all kinds of factors in the evaluation of serviceability limit state of deficient prestressed concrete bridge. The main research works and results are as follows:(1) The fuzzy and random comprehensive evaluation method of the serviceability state of deficient prestressed concrete bridge is presented. According to concrete section-reduction coefficient and generally equation of serviceability state of prestressed concrete structure that is summarized according to the various factors of influencing the effect of actions of serviceability state of deficient prestressed concrete bridge, generally evaluation equation of serviceability limit state of deficient prestressed concrete bridge is established. By introducing the concept of statistical mathematics and fuzzy mathematics, two kinds of uncertainty questions are solved reasonably. Finally, the fuzzy and random comprehensive evaluation method of the serviceability state of deficient prestressed concrete bridge is presented(2) Evaluation process of the fuzzy and random comprehensive evaluation method of the serviceability state of deficient prestressed concrete bridge is summarized. The method mainly includes five steps: the first step, obtaining the distribution characteristics of all kinds of detection indexes; the second step, determining the distribution characteristics of the concrete section-reduction coefficient; the third step, calculating structure or component internal force of the control cross section and midspan deflection; the fourth step, calculating section stress of the structure or component; Fifth, evaluating the actual status of deficient prestressed concrete bridge.(3) Comprehensive display interface is designed. The fuzzy and random comprehensive evaluation method introduced in the paper need to use three dimensional design software, general finite element analysis software and programming software. In order to integrate the informations that are produced by different software and improve work efficiency, comprehensive display interface of the fuzzy and random comprehensive evaluation method is compiled by using MATLAB software.(4) Evaluation calculation of the serviceability state of a deficient prestressed concrete bridge.Comparing with standardize evaluation method, the fuzzy and random comprehensive evaluation method of the serviceability state of deficient prestressed concrete bridge is more correspond with the practical condition.Therefore, the fuzzy and random comprehensive evaluation method of the serviceability state of deficient prestressed concrete bridge can provide strong theoretical basis for the reliability analysis of deficient prestressed concrete bridge.