荷載與海洋環(huán)境耦合作用下海工混凝土結(jié)構(gòu)耐久性研究
[Abstract]:The service life of reinforced concrete structures is reduced due to premature performance degradation, which is often not due to insufficient strength, but because of their lack of durability. At present, there is a mature research on the deterioration of the durability of concrete structures caused by single environmental factors such as chloride ion invasion and carbonization. The decrease in durability of concrete due to poor durability is mostly the result of multiple factors such as load, environment and climate. It is bound to be significantly different from the law of concrete structure deterioration under single environmental factors. The coupling effect of environment and load is not a simple superposition of the effects of the single factor, so as to reveal the coupling of load and environment in depth. It is necessary to study the permeability and change law of chloride ion in concrete under load and marine environment, and establish the interrelation between the internal micro change of concrete structure and the macroscopic deterioration of durability in concrete structure. In the study of soil structure durability, the load level of reinforced concrete structural members under normal conditions of the wharf is investigated and analyzed. A new type of synchronous coupling system with chlorine salt erosion environment is developed and applied to the experimental study of the chlorinated concrete structure under the fatigue load, and the concrete under static load is compared. The law of chlorine ion invasion reveals the quantitative influence of fatigue load on the chloride ion permeability of concrete and applies it to the durability life prediction of concrete structures. The main contents and conclusions of this paper are as follows: (1) the method of combining theoretical calculation with actual monitoring in the field is used to investigate the case of Southern China pier engineering. The load state and internal force of the typical beam components in the high piled wharf are analyzed. The results show that the load level of the component in the wharf is about 0.1~0.47 without considering the influence of the component weight. (2) developing the synchronous coupling test equipment system of the moving load and the marine environment, which can provide a variety of frequencies and various frequencies. The alternating load of loading method can simulate the "simultaneous coupling action" environment of the marine structure in the load and the environment, and realize the synchronous coupling effect of the dynamic load and the chlorine salt erosion environment. (3) the dynamic load and the synchronous coupling test system of the marine environment are used to carry out the load and chlorine salt of the reinforced concrete. The coupling test of the environment (the load level is 0.5,0.3,0.15 respectively, the loading frequency is 2Hz, 5Hz, 10Hz respectively, at the same time the spraying and loading begin to end at the same time, the spraying amount is about 15L/h), to study the chloride penetration law in the reinforced concrete structure under the load and corrosion simultaneously, and reveal the mechanism of the deterioration of the durability of the concrete structure by the alternating load. (4) The chlorine ion content was measured in the pure bending section sample of the completed coupling test. The mechanism and model of the chloride ion erosion under the coupling of load and corrosion were studied. The transmission behavior of chlorine ion under different loading levels and different loading frequencies was analyzed, and the interaction between the coupling factors of load and environment was explored, and chlorine ion was obtained. The influence factor of the load on the diffusion coefficient is modified, and then the original chloride permeability model is corrected. (5) through the internal damage CT scanning test of the members after the coupling, various image processing methods and analysis methods are used to explore the crack morphology and evolution rules of concrete, and to find out the damage situation and load size and the time of loading. In order to establish the damage law of concrete under the ocean salt fog environment and load, the mechanism of concrete meso damage evolution process and its effect on the law of durability degradation are explored. (6) based on the experimental research results, the durability life model of reinforced concrete structure is established on the basis of reliability theory. The key parameters are modified, and the durability life prediction model of concrete structures under the interaction of fatigue load and marine environment is established. The model is used to calculate the durability life of the crossbeam structure of high pile wharf. The calculation results are in good agreement with the actual situation, and the durability life model is used in the dock junction. Durability life design of structural members.
【學(xué)位授予單位】:華南理工大學(xué)
【學(xué)位級別】:博士
【學(xué)位授予年份】:2016
【分類號】:TV33
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