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The Sensitivity Analysis of Reliability Related to Uncertain Factors to Bridges

Author: ZhengZhouJun
Tutor: ShenChengWu
School: Wuhan University of Technology
Course: Structural Engineering
Keywords: Reliability Monte Carlo method Response Surface Methodology Sensitivity System Reliability
CLC: U441
Type: Master's thesis
Year: 2005
Downloads: 485
Quote: 7
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Abstract


The probability of engineering structures within a predetermined time under a predetermined condition, the completion of a predetermined function is called the reliability of the structure. Components and system reliability analysis of new bridges, and bridge the life of the bridge structure when varying reliability analysis to determine the intended function of the probability to be completed within the specified time, the results have a certain bridge design, construction and maintenance guiding role. The reliability of the past, because of the limitations of the computing power of the structural reliability analysis has been stuck in the reliability analysis of structural members, computer calculation speed has been greatly improved today, the overall static failure mode for large bridges The analysis not difficult. Based on this thinking, newly built one CFST Arch Bridge scheduled life within the overall static reliability analysis using Monte Carlo method and response surface method calculated to obtain the desired results. At the same time using the principle of correlation, sensitivity analysis of some of the bridges uncertainties reliability, better describes the random variables of the bridge structure, similar papers in the country is also unusual. Qing River Bridge is a main span of 90 meters with a rigid Tied under through CFST arch bridge to span ratio is 1/6. Firstly, under dead load on the bridge for structural analysis, analysis of the distribution of maximum stress, to determine the bridge maximum probability of possible failure modes. Then were the most unfavorable position of the failure mode, the live load, load, and to determine the bridge ultimate bearing status, in order to bridge Reliability Analysis. Based on static analysis, consider the random variables of the state of the bridge structure, to range segmentation analysis using random variables, and discuss the impact of the change on the bridge structure. Determine the failure modes of the structure and the random variable probability distribution, respectively, using the Monte Carlo method and response surface method for reliability analysis of the bridge, the calculation results of the two calculation methods, showed that the two relatively close, have made good the calculation results. At the same time using the method of mathematical statistics, respectively random variables and failure modes corresponding stress values ??of the correlation analysis, analysis of the sensitivity of the value of the random variable stress on the failure mode. Using both bitmap visually demonstrate the relationship between the stress the value of a random variable with failure mode. Subsequently, taking the bridge structure in the actual operations by the natural environment, the use of the environment and the material itself factors impact the bridge structural resistance continue to reduce as a time-varying system reliability analysis of the bridge in the bridge life, is also of great significance . This article through a phased bridge based on time-varying reliability analysis, the bridge reliability process of change over time. Finally, on the basis of the correlation analysis, adding random variable changes over time, the bridge variant reliability sensitivity analysis of these random variables.

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CLC: > Transportation > Road transport > Bridges and Culverts > Structural principles, structural mechanics
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