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Inpesting Appraising and Reliability Assessment of Existing Concret Simple Supported Beam-Bridge

Author: WangAiHua
Tutor: YuGuangMing
School: Qingdao Technological University
Course: Structural Engineering
Keywords: Bridge structure Remaining service life Target reliability index University Master's degree thesis Existing bridge Concrete strength Structural members Structural Reliability Analysis Load effect
CLC: U445.7
Type: Master's thesis
Year: 2008
Downloads: 44
Quote: 1
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Abstract


With the rapid development of economic construction, and transportation infrastructure, a considerable part of our existing bridge load standard is low because of the design and other environmental complexity and overload appears deck cracking, breakage, corrosion, concrete carbonation depth and serious problems seriously affect the normal use of the bridge, part of the old bridge has been in a dangerous bridge. Therefore, the detection, identification, and the remaining life of the forecast in the status quo of the existing bridge, it is of great significance, caused widespread concern in the engineering and technical personnel. The reliability assessment of the existing bridge structure and its prediction of the remaining life of bridge engineering community problems to be solved. Solve this problem, the use of variant reliability theory, reliability analysis, and the status quo of the existing bridge structure change assessment, and based on the structure of the decay law, the remaining life of the existing bridge structure forecast. Made in this article and the main results achieved as follows: 1. Summarizes the detection of the bridge structure, including the strength of the concrete, defect detection of carbonation depth, steel corrosion detection, structural deformation and cracks detection. Summarized and analyzed the structural reliability of some of the basic concepts and basic theory, and propose a reliable indicator of some commonly used method of calculating such FOSM method, JC method and Monte Carlo method. In this paper, we consider the structural component material properties, geometric parameters as well as the uncertainty of the calculation mode attenuation of the bridge structural resistance, taking into account the attenuation of resistance over time, drawing on the basis of the results of previous studies on the introduction of the time parameter, establish The attenuation model the structural resistance of the bridge. Load of concrete bridges by permanent load and variable load composition the basic variable load in the main part of the vehicle load and its influence. Bridge in the service process, the impact of the variable load effect parameters are time-varying random variables, such as vehicle load, axle load on the bridge of the number of vehicles, road conditions, etc.. In this paper, the Ministry of Transportation highway bridge vehicle loads study research group surveys of the random variable data as a basis for the establishment of a girder bridge in service load model. 5 target reliability index is the basis for identification of structural reliability existing bridge reliability assessment are not considered a reliable indicator of the target when degeneration, may lead to the conclusions of the assessment to the deviation. Considering the target reliability index become dynamic reliability assessment methods to explore the existing bridge and structural reliability rating quantitative calculation method, the time-dependent reliability theory and current engineering structure reliability appraisal standards \graded combined to improve the objectivity of the assessment. 6. Conventional structural reliability analysis are based on the static reliability method, this project is actually some gaps. Learn from the results of previous studies based on the introduction of time-varying reliability theory, application bridge structure of resistance attenuation model and load model, the establishment of a the bridge structure corresponds to a limit state time-varying reliability limit state equation. Resistance is a function of time, the first resistance discretization, and then obtained through the establishment of the bridge structure on a time limit state equation, bridge structures when the moment becomes a reliable indicator of β (t), and finally when target reliability index [β] becomes a reliable indicator of the structure are compared, we can evaluate the status of bridge structure. Using ANSYS software simply supported concrete beam bridge static load test simulation and modal analysis, consistent with the field test results. Draws on the prediction of the remaining service life of concrete simply supported girder bridge construction work based on time-varying reliability analysis method, a simply supported concrete beam bridge the remaining service life of the structure in a certain level of reliability.

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