本文選題：濱�；炷两Y(jié)構(gòu)　切入點(diǎn)：金屬材料銹蝕　出處：《深圳大學(xué)》2017年碩士論文

【摘要】：氯離子引起鋼筋銹蝕通常被認(rèn)為是濱海鋼筋混凝土結(jié)構(gòu)性能劣化的主要原因,而鋼筋銹蝕則因其表面集聚的氯離子濃度達(dá)到閾值進(jìn)而破壞鋼筋表層的鈍化膜所致。電化學(xué)方法是判別鋼筋起銹和銹蝕速率的常規(guī)方法,但該方法測(cè)試手段間接,測(cè)試結(jié)果離散性大。據(jù)此,本文基于一種辨識(shí)鋼筋等金屬材料銹蝕的新型裝置及原理,探討利用該裝置進(jìn)行測(cè)試的技術(shù)問題和可選方案,為進(jìn)一步開展鋼筋等金屬材料銹蝕的系列研究,尋求建立新型辨識(shí)準(zhǔn)則和測(cè)試規(guī)程提供理論和技術(shù)支撐。主要研究工作和成果如下。1.簡(jiǎn)要介紹了所述鋼筋等金屬材料銹蝕的新型辨識(shí)裝置的基本構(gòu)造和原理,它由施力件、受力鋼絲及兩者的連接部組合而成。其中,施力件彎曲成弓型而對(duì)鋼絲施加不同水平的預(yù)定應(yīng)力,鋼絲用于模擬實(shí)際結(jié)構(gòu)中的受力鋼筋,通過鋼絲的蝕斷提示鋼筋銹蝕并辨識(shí)其銹蝕速率。鑒于整個(gè)裝置弓型外形,以下簡(jiǎn)稱其為“弓型裝置”。2.探討了利用弓型裝置進(jìn)行金屬材料銹蝕辨識(shí)試驗(yàn)的技術(shù)可行性:真空環(huán)境中對(duì)裝置進(jìn)行長(zhǎng)期靜置觀測(cè),排除了常規(guī)應(yīng)力下弓型裝置鋼絲由于應(yīng)力疲勞而斷裂的可能性;對(duì)腐蝕環(huán)境下鋼絲斷口的顯微觀測(cè),則確定了鋼絲斷裂由腐蝕損傷所致的結(jié)論。3.分別采用試推和理論方法建立弓型裝置重要力學(xué)參數(shù)——鋼絲應(yīng)力的簡(jiǎn)便計(jì)算方法并互證了計(jì)算結(jié)果的有效性;進(jìn)而提出了制作目標(biāo)應(yīng)力弓型裝置的方法并形成了相應(yīng)專利初稿,由此提高了利用弓型裝置開展應(yīng)力腐蝕系列研究的效率和精度。4.考慮施力件材料特征、鋼絲及連接部封裝形式等因素,進(jìn)行了弓型裝置設(shè)計(jì)方案有效性的試驗(yàn)比較,從中優(yōu)選出了測(cè)試結(jié)果穩(wěn)定、離散性小的測(cè)試方案,較好解決了利用弓型裝置開展鋼筋等金屬材料銹蝕試驗(yàn)研究的關(guān)鍵技術(shù)問題。5.利用弓型裝置的合理試驗(yàn)方案,試驗(yàn)研究了鋼絲銹蝕銹斷時(shí)間、銹蝕速率的變化規(guī)律和分布特征,探討了應(yīng)力水平對(duì)鋼絲銹蝕的影響。
[Abstract]:The corrosion of steel bars caused by chloride ions is generally considered to be the main cause of deterioration of the performance of coastal reinforced concrete structures, while the corrosion of steel bars is caused by the concentration of chloride ions on the surface reaches the threshold and then destroys the passivation film of the reinforcement surface.Electrochemical method is a conventional method for judging the rusting and rusting rate of steel bars, but the method is indirect and the test results are widely dispersed.On the basis of this, based on a new device and principle for identifying corrosion of steel bars and other metal materials, this paper discusses the technical problems and optional schemes of testing with this device, in order to further carry out a series of researches on corrosion of metal materials such as steel bars.Seek to establish new identification criteria and test procedures to provide theoretical and technical support.The main research work and results are as follows.This paper briefly introduces the basic structure and principle of the new identification device for corrosion of the steel bars and other metal materials. It is composed of the applied parts, the stressed steel wires and the connecting parts of the two parts.The steel wire is used to simulate the stress of the steel bar in the actual structure. The corrosion of the steel bar is indicated by the erosion of the steel wire and the corrosion rate of the steel bar is identified.In view of the whole device bow shape, hereinafter referred to as "bow device". 2.The technical feasibility of corrosion identification test of metal material using bow device is discussed. The device is observed in vacuum environment for a long time and the possibility of steel wire fracture due to stress fatigue is excluded under conventional stress.According to the microscopic observation of steel wire fracture in corrosive environment, the conclusion that steel wire fracture is caused by corrosion damage is determined.A simple calculation method of steel wire stress, which is an important mechanical parameter of arch device, is established by means of trial and theoretical methods, and the validity of the calculation results is verified.Furthermore, the method of making the target stress bow device is put forward and the corresponding patent draft is formed, which improves the efficiency and precision of using the bow device to carry out the research on stress corrosion.Taking into account the material characteristics of the load-acting parts, the encapsulation form of the steel wire and the connection part, the experimental comparison of the effectiveness of the design scheme of the bow device is carried out, and the test scheme with stable test results and small dispersion is selected.The key technical problem of corrosion test of steel bar and other metal materials is solved.Based on the reasonable test scheme of the arch apparatus, the variation and distribution characteristics of rust breaking time and corrosion rate of steel wire were studied, and the influence of stress level on the corrosion of steel wire was discussed.
【學(xué)位授予單位】：深圳大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU511.32

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本文編號(hào)：1727980