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City Small Concrete Bridge In Service Reliability Assessment And Life Prediction

Posted on:2009-10-25Degree:MasterType:Thesis
Country:ChinaCandidate:J J GuoFull Text:PDF
GTID:2192360278953744Subject:Civil engineering
Abstract/Summary:PDF Full Text Request
With the action of natural environment, increasing traffic flow and vehicle load, material deterioration, the concrete bridges have undergone various degree damages on three levels of material, component and structure as time goes on. And with the accumulation of these damages, the concrete bridge's bearing capacity, performance and durability will drop or degrade, so its normal service function is influenced. How to evaluate the reliability of existing concrete bridge and to forecast bridge's remaining service life rationally, has gradually become one of the concerned problems in the domain of domestic and foreign bridge academia. At present, the research on the reliability of existing concrete bridge is not abundant, which is the starting point of this dissertation.Based on the consult of related information and the experience of experts in foreign countries and China, the fuzzy reliability evaluation model of existing bridges is built and the applied analysis method is put forward in this paper. In order to evaluate existing bridges' safety, the project layer mostly conside seven influencing factors which affect the serviceability of bridge structure, such as girder, diaphragm, supports, capping beam, pier and abutment, foundation and foundation scouring. All these seven factors are vested their own different weights. In the index layer, referring to the "Standard for appraiser of reliability of civil buildings"(GB50292 - 1999), four evaluation factors such as bearing capacity,deformation. cracks and joint structure which have the different weights and the different membership functions of each evaluation index are imported.Based on fuzzy evaluation of the existing beam bridges. Markov forecasting method and bearing capacity forecasting curve of bridges' fuzzy reliability level in the future service is put forward in this paper. It supplies the theoretical reason to the bridges' maintenance and reinforcement in the future service.
Keywords/Search Tags:existing reinforced concrete bridge, reliability evaluation, Fuzzy Evaluation, Analytic Hierarchy Process, Membership Function, Markov Processes
PDF Full Text Request
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