Technical Condition Evaluation Of In-Service Stone Arch Bridge Based On AHP And FCE

Stone arch bridges have unique advantages in stress and material acquisition.There are many old bridges and even dangerous bridges built in China early.In order to ensure the reliability of structures and enable them to continue to play a better role in road traffic,it is necessary to fully understand the working performance of stone arch bridges so as to maintain and strengthen them scientifically.At present,there are few studies on stone arch bridges.According to the existing research data on Revision of masonry bridge and culvert codes,diseases of existing stone arch bridges are common,which affect the reliability of structures in varying degrees.In this paper,the evaluation method of the technical condition of stone arch bridge is studied,which has a certain practical significance.This paper expounds the origin,development,management status and evaluation significance of stone arch bridge,chooses analytic hierarchy process and fuzzy comprehensive evaluation method to evaluate the technical status of stone arch bridge on the basis of comparative analysis of bridge evaluation methods at home and abroad,and makes a detailed analysis of common diseases from the aspects of design,construction and operation according to the structural and material characteristics of stone arch bridge and the investigation data.Based on this,the basic indexes of the evaluation system are determined,and the corresponding evaluation set is determined by referring to the current specifications;the hierarchical model for evaluating the technical status of stone arch bridges is constructed by combining the safety,durability and applicability of stone arch bridges with the structural characteristics of the bridges;the initial weights of each index are determined by expert group decision-making method and cluster analysis method,and the weights of each index are changed by using the method of variable weights.Analyse and strengthen the importance of "deterioration" indicators,improve the corresponding weight,in order to optimize the evaluation results.The membership function of each index is determined by using the fuzzy theory,and the concept of grey relational degree is introduced to process the sequential index.Finally,the fuzzy comprehensive evaluation system established in this paper is applied to a real bridge,and the safety,durability and applicability evaluation results and the whole bridge evaluation results are obtained by multi-level fuzzy comprehensive operation based on the field detection data,which are verified by comparison with the specifications.The structure and flow chart of the software design for the fuzzy evaluation of stone arch bridge are given.