本文關(guān)鍵詞： 海洋環(huán)境 混凝土 氯離子擴散 鋼筋阻滯效應(yīng) 耐久性　出處：《天津大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：鋼筋混凝土結(jié)構(gòu)廣泛應(yīng)用于港口、海岸及近海工程中,多年使用經(jīng)驗表明,由海洋環(huán)境中的氯離子引起的結(jié)構(gòu)耐久性破壞已經(jīng)成為其設(shè)計與維護(hù)中面臨的一個十分嚴(yán)重的問題。雖然國內(nèi)外學(xué)者對該問題已經(jīng)開展了很多的研究,但由于其問題十分復(fù)雜,很多研究還不完善。針對氯離子侵蝕的研究,目前得到的氯離子擴散模型大都忽略了鋼筋存在的阻滯影響以及鋼筋前沿至混凝土表面這一淺層混凝土區(qū)域氯離子擴散的特殊性。本文著眼于耐久性破壞的第一階段氯離子侵蝕,在總結(jié)前人研究的基礎(chǔ)上,通過試驗及有限元分析的方法對鋼筋存在的阻滯效應(yīng)以及鋼筋前沿至混凝土表面這一淺層混凝土區(qū)域氯離子擴散的特殊性做了一些探索。主要研究內(nèi)容如下:(1)對前人大量的氯離子侵蝕機理研究成果進(jìn)行整合、對比、分析,明確各機理模型的差異及特定應(yīng)用條件。引入本課題組的最新成果,梳理出合理的氯離子擴散模型。(2)針對淺層混凝土區(qū)域氯離子擴散特殊性這一問題,通過試驗的方法,測定了距離混凝土表面不同距離位置處的氯離子濃度,從骨料引入和拜德-休克爾理論對擴散性的影響出發(fā),對試驗數(shù)據(jù)進(jìn)行分析,建立了能普遍應(yīng)用于工程實踐的隨深度變化的氯離子擴散模型。(3)開展考慮鋼筋阻滯效應(yīng)的氯離子傳輸規(guī)律的試驗研究,測定保護(hù)層區(qū)域各處的氯離子濃度,通過將鋼筋前沿與素混凝土中相應(yīng)深度處的氯離子濃度進(jìn)行比較分析,揭示了鋼筋直接和間接這兩種影響效應(yīng),最終得到了考慮鋼筋阻滯效應(yīng)的氯離子擴散模型。(4)采用ANSYS軟件的熱分析模塊對氯離子濃度分布進(jìn)行有限元模擬,并運用氯離子的擴散隨著深度變化的研究成果,完善模型,使模擬更準(zhǔn)確。隨后對鋼筋阻滯效應(yīng)的各影響因素(鋼筋直徑、間距、混凝土保護(hù)層厚度、表面氯離子濃度)進(jìn)行了全面的研究。
[Abstract]:Reinforced concrete structure is widely used in port, coastal and offshore engineering, many years of experience show that caused by the chloride ions in the marine environment, the structure of durability damage has become its design and maintenance is facing a very serious problem. Although domestic and foreign scholars have conducted a lot of research on this problem, but because of the problem is very complicated, the research is still not perfect. To study the erosion of chloride ion, the chloride diffusion model mostly ignored the effect of the presence of reinforcement and block surface reinforced concrete to the forefront of the shallow areas of concrete chloride diffusion. This paper focuses on the particularity of the first stage on the durability damage of chloride ion erosion and on the basis of previous studies, through the method of experiment and finite element analysis of reinforced block effect exists and to the front surface of the reinforced concrete The particularity of the shallow area concrete chloride ion diffusion to do some exploration. The main contents are as follows: (1) the integration of previous research results, the mechanism of large amount of chloride ion erosion contrast analysis, clear differences in the mechanism model and specific application conditions. The introduction of the latest achievements in the research group, sort out the chloride ion the reasonable diffusion model. (2) in the shallow area of concrete chloride ion diffusion problems this particularity, through experimental method, the distance of chloride ion concentration in concrete surface in different distance position was determined, and Hugh, introduced from the aggregate effects of Kerr's theory on diffusion of the analysis of test data, the establishment of the chloride ion can be generally applied to the engineering practice of the depth dependent diffusion model. (3) to carry out experimental study on the chloride ion transmission law of reinforced block effect, determination of chloride ion protective layer around the region The concentration of the chloride ion concentration, the corresponding depth of reinforced concrete in front and the comparative analysis reveals that these two kinds of direct and indirect reinforcement effect, finally obtained the chloride ion diffusion model considering the effect of reinforced block. (4) using ANSYS software the thermal analysis module of finite element simulation of chloride ion the concentration distribution, diffusion and use of chloride ion with the research results, the changes of the depth of the perfect model, make the simulation more accurate. Then the influence of reinforced block effect factors (bar diameter, spacing, thickness of concrete cover, surface chloride concentration) was studied.

【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU528

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本文編號：1499795