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The bridge is the key to ensure smooth traffic and control parts , by the design criteria , age, quality of construction , materials , maintenance quality , environmental pollution, erosion, changes in traffic load , an accident and road rating by other factors , the occurrence of aging, breaks, cracks , deformation and load capacity is too large reduction phenomenon , leading to functional decline and even structural damage , not normal use . In order to provide safe, fast and comfortable driving conditions , to ensure the normal operation of the bridge , the existing bridge must make a correct evaluation of working conditions . This paper summarizes current research at home and abroad on the bridge assessment based on the results of concrete beam bridge work status assessment methods for further study. Paper describes the bridge connotation and basic characteristics assessed , and the status of the bridge assessment methods are summarized and reviewed. Through high five on the West Yu Shiyu Zuo concrete beam bridge detection , summed up the typical Liangqiao Rong -prone diseases, and a detailed analysis of the causes of these diseases . Paper elaborates Analytic Hierarchy Process (AHP method ) structural model , ideas and characteristics , and introduces the basic AHP methods and procedures , as well as the determination of weights . In addition, also discusses the basics of fuzzy set theory and fuzzy evaluation of the basic methods and procedures. Using the above principles, combined with existing data and related regulations , the establishment of concrete beam bridge working condition assessment model , and calculate the value of the index weight of each layer , using fuzzy distribution and qualitative description method establishes the membership function of the underlying index , and concrete bridges comprehensive assessment . Shaanxi Xiyu Expressway Ishikawa River Bridge as an engineering example , using the method described in this paper a comprehensive assessment of the bridge , and the results show that the method on the existing concrete bridge situation assessment is feasible.
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