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Durability Study of the Concrete Bridge in Common Atmosphere Environment and Its Maintenance Strategy Optimization

Author: ZouJuan
Tutor: ShaoXuDong
School: Hunan University
Course: Bridge and Tunnel Engineering
Keywords: Reinforced concrete bridge Durability Carbonation of concrete Steel corrosion Reliable indicator Maintenance strategy optimization
CLC: U445.7
Type: Master's thesis
Year: 2009
Downloads: 176
Quote: 1
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Abstract


Reinforced concrete bridge structure in the internal or external , man-made or natural factors , along with the increase of service time , the performance of the structure will be gradually degraded, so that the decline in carrying capacity , affect the performance of the safe and proper use of the structure , shorten the life of the structure . Cause corrosion of reinforcement in this article from the carbonation of concrete began to study the durability of concrete bridge in the general atmospheric environment on the concrete bridge maintenance strategy optimization , mainly to do the following aspects : ( 1 ) from the material terms of the durability of concrete bridges study , analysis of the mechanism and influencing factors of carbonation of concrete , summarize stochastic models to forecast concrete carbonation depth ; steel corrosion mechanism and process analysis , summarize the relevant mathematical model for steel corrosion . (2 ) the use of the reliability theory durability analysis of concrete bridge structure , focus on the calculation of of concrete carbonation reliable indicators as well as the protective layer of rust cracking a reliable indicator of the calculation , and analyze the factors affecting them , obtained a protective layer of concrete the greater the thickness , the higher the level of strength of concrete , the carbonation reliable indicators and the protective layer of rust cracking a reliable indicator of the slower decline conclusions . On this basis , the calculation of its life by the the durability decision carbonized life and rust expansion cracking . ( 3 ) bridge in the service process , and its reliability is a dynamic stochastic process , resistance model and load model based on the probability of uncertainty factors affect concrete bridge resistance bridge resistance when degeneration , build bridges , to build bridges based on dynamic and reliable indicators of limit state equation . And using the Monte Carlo method , considering the uncertainty factors affect the the bridges carrying capacity reliable indicators , write the program , the calculation of the the concrete actual bridge - kiln back bridge maintenance activities based on the carrying capacity of a reliable indicator of deterioration curve . ( 4) no back in the kiln bridge maintenance activities based on a reliable indicator of the deterioration of the bearing capacity curve based on genetic algorithms , write the program , to optimize the maintenance strategy of concrete bridges , designed to optimize the allocation of limited funds , meet the required performance throughout the service life of the bridge .

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