Life Prediction Method of Reinforced Concrete Bridge Under Seasonal Corrosion and Fatigue Coupling
A technology for reinforced concrete and life prediction, which is applied in the directions of weather resistance/light resistance/corrosion resistance, test material strength by applying repeated force/pulsation force, and measurement device, which can solve the coupling effects of seasonal environmental changes and fatigue that have not been considered in research and other problems, to achieve the effect of novel prediction methods
Active Publication Date: 2022-01-07
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology
In addition, the service environment of bridges changes with the seasons, and there are certain differences in the degree of structural performance degradation in different seasonal environments.
In the existing evaluation methods for the fatigue life of reinforced concrete bridges, no research has considered the effects of seasonal environmental changes and fatigue coupling effects
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Embodiment 1
[0115] like Figure 1-4 , The present embodiment discloses a reinforced concrete bridges Life Prediction Methods A Seasonal coupling corrosion and fatigue, the detailed steps of the calculation method is as follows:
[0116] (1) to give corrosion initial time within a reinforced concrete based on Fick's second law of diffusion; the same time, before the steel corrosion initially, a small crack growth and the near threshold crack growth analysis, reinforced pure fatigue crack material microscopic defects and vehicle loading induced growth in length;
[0117] (2) The corrosion current density is expressed Steel Corrosion Rate, calculated time the concrete cover cracking and the crack to a critical width, be considered Steel Corrosion Rate model of concrete cover cover cracking injury; The corrosion rate model, calculated corroded growth rate of rust pit depth and pit, as described below:
[0118] In the fatigue test carried out reinforcement or finite element analysis at varying degr...
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The life prediction method of reinforced concrete bridges under the coupled action of seasonal corrosion and fatigue disclosed in the present invention divides the life of reinforced concrete bridges into three stages: the initial stage of corrosion - the development stage of pure fatigue cracks, the stage of competition between rust pits and fatigue cracks, and the structural stage. In the failure stage; based on Fick’s second diffusion law and considering the influence of concrete rust swelling and cracking damage, establish the model of steel bar corrosion initial and rust pit growth; test and simulate the law of steel crack growth under the influence of four seasons environment, and determine the fatigue crack growth characterization parameters; The stress intensity factor model of concentrated influence proposes an analysis method for steel corrosion fatigue crack growth corresponding to the four seasons environment; clarifies the structural failure criteria, combines the vehicle load observation information, and systematically considers the competitive coupling relationship between rust pit growth and fatigue crack growth, and distinguishes them in real time Failure modes to realize bridge life prediction. This method is novel and reasonable, and can provide technical support for the safety assessment of concrete bridges in service.
Description
Technical field [0001] The present invention relates to the field of security assessment service bridges, in particular, to corrosion fatigue life evaluation method considering seasonal variation of reinforced concrete bridges. Background technique [0002] With today's rapid growth of traffic and deteriorating environmental conditions, corrosion fatigue has become one of the main effects of the reinforced concrete bridge in service performance degradation. Reinforced concrete bridge during service constantly subjected to repeated load of the vehicle. Meanwhile, in the coastal environment, or extensive use of de-icing salt, deicing salt under the circumstances, the problem of corrosion of reinforced concrete bridges becoming more prominent. It will accelerate corrosion fatigue damage accumulation steel, significantly reducing the service life of the structure. Corrosion can cause local stress concentration, fatigue failure of steel were found to fracture analysis, steel fatigue c...
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IPC IPC(8): G01N3/32G01N3/56G01N17/00
CPCG01N3/32G01N3/56G01N17/00G01N17/02G06F17/10G01N33/38G01N17/006G01N33/383
Inventor 马亚飞郭忠照王磊张建仁
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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