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Based on Fuzzy Theory after a Continuous Girder Bridge Reliability Assessment

Author: GuoWangJun
Tutor: ZhangKaiPeng
School: Wuhan University of Technology
Course: Bridge and Tunnel Engineering
Keywords: Continuous beam bridge in service Fuzzy Theory Reliability Assessment Carrying capacity Failure Mode Search
CLC: U445.72
Type: Master's thesis
Year: 2010
Downloads: 91
Quote: 2
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Abstract


As traffic increases, serious overloading and other natural factors and human factors , in-service bridges had different levels of damage, these losses will inevitably lead to the decline in the carrying capacity of existing bridges , performance degradation , decrease in durability . With the development of urban and rural roads and bridges in the national economy and social life is becoming increasingly important in the existing bridge reliability problem is getting attention. Currently in service on the reliability of concrete continuous beam bridge not many studies , this is the starting point of this article . Fuzzy comprehensive evaluation method is carried out on the bridge in service effective way to assess the reliability , the main process is: First, to build bridges index set , followed by determining the weight of evaluation index and evaluation indicators for assessing levels of membership functions , again based on field testing the results and the carrying capacity of the existing bridge calculation of indicators fuzzy evaluation , and finally according to the fuzzy calculation method to calculate and determine the method based on fuzzy level bridge reliability levels. In this paper, fuzzy theory to assess the reliability of continuous beam bridge in order to make the right decisions for the project guidance . The main work is as follows : ( 1 ) , while adhering to their predecessors as the evaluation index set { bearing capacity , deformation, cracks } , based on the fuzzy comprehensive evaluation method was perfect: the introduction of the concept of variable weight , and evaluation of the evaluation stage the membership for a more in-depth analysis . ( 2 ) proposed in-service failure mode searching continuous beam bridge carrying capacity calculation methods and theories , and a continuous beam bridge reinforcement before and after a failure mode Search and carrying capacity calculations . ( 3 ) , on the forehead Bay Overpass upstream second joint ( 5 -span continuous beam bridge ) before and after reinforcement fuzzy comprehensive evaluation method for reliability assessment . Bay Overpass bridge on the forehead line second joint reliability fuzzy assessment results as: reinforcement before the bridge grade three , need to be reinforced. Reinforced bridge grade level , carrying capacity to meet reliability requirements. Fuzzy comprehensive evaluation theory and Wuhan bridge experts to discuss the results of basic line , indicating that this evaluation method is feasible .

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CLC: > Transportation > Road transport > Bridges and Culverts > Bridge Construction > Bridge maintenance, repair and remediation > Bridge strengthening
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