發(fā)布時間：2018-02-16 23:04

  本文關(guān)鍵詞： 海上風(fēng)機 腐蝕機理 腐蝕數(shù)學(xué)模型 數(shù)值分析 防腐優(yōu)化設(shè)計　出處：《重慶交通大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：風(fēng)機基礎(chǔ)是|海上風(fēng)機機組的重要組成部分，其作為永久性建筑長|期佇立在苛刻的海洋腐蝕環(huán)境中，防腐蝕設(shè)|計關(guān)系到風(fēng)機|結(jié)構(gòu)基礎(chǔ)|的安全使用。在風(fēng)機基礎(chǔ)設(shè)計使用年限內(nèi)只進行結(jié)構(gòu)可靠性分析，卻不考慮因|腐蝕引起|結(jié)構(gòu)承載能|力的變化是非常危險的。迄今為止，海上風(fēng)機鋼管樁基礎(chǔ)防腐問題一直沒有得到很好的解決。鑒于此，本文以教育部博士點基金項目（20125522110004）和重慶市自然科學(xué)基金重點項目（cstc2013jjB3002）為依托，以上海東海大橋海上風(fēng)電場項目為工程背景，在前人研究的基礎(chǔ)上，采用理論分析及數(shù)值模擬等手段，對海上風(fēng)機鋼管樁基礎(chǔ)耐腐蝕性進行了研究。主要研究內(nèi)容及成果如下： （1）以東海大橋海上風(fēng)電場為工程背景，分析了海上風(fēng)機基礎(chǔ)主要環(huán)境荷載計算方法及荷載組合，并對3MW級海上風(fēng)機鋼管樁基礎(chǔ)進行了正常運行工況及極限荷載工況下荷載計算。從樁-土相互作用機理出發(fā)，采用P-y曲線法模擬樁土接觸的非線性行為，并利用地層資料進行了計算，得到了風(fēng)機鋼管樁地基土體的P-y曲線數(shù)據(jù)，為腐蝕影響下風(fēng)機鋼管樁強度及穩(wěn)定性的折減分析提供荷載數(shù)據(jù)和邊界數(shù)據(jù)。 （2）通過對海洋環(huán)境下鋼結(jié)構(gòu)的腐蝕類型及腐蝕機理進行分析，得出海上風(fēng)機鋼管樁基礎(chǔ)腐蝕裂紋擴展是陽極溶解和表面膜破裂共同作用的結(jié)果，為研究海上風(fēng)機鋼管樁腐蝕速率發(fā)展規(guī)律及腐蝕對樁基結(jié)構(gòu)強度和穩(wěn)定性的影響奠定理論基礎(chǔ)。 （3）通過對現(xiàn)有海工鋼結(jié)構(gòu)腐蝕數(shù)學(xué)模型的分析，確定了符合海上風(fēng)機鋼管樁基礎(chǔ)的均勻腐蝕數(shù)學(xué)模型為考慮防腐系統(tǒng)與腐蝕環(huán)境共同作用的非線性腐蝕模型。在此基礎(chǔ)上，通過對土體材料及風(fēng)機鋼管樁本構(gòu)模型的分析，建立了腐蝕條件下海上風(fēng)機鋼管樁基礎(chǔ)的三維有限元模型，并分別對風(fēng)機鋼管樁的均勻腐蝕和局部腐蝕進行有限元模擬計算，得到了不同腐蝕形態(tài)下風(fēng)機鋼管樁強度及穩(wěn)定性的折減規(guī)律。 （4）綜合模擬腐蝕分析結(jié)果，，對照海上風(fēng)機鋼管樁的常規(guī)防腐設(shè)計思路和防腐措施，提出了針對海上風(fēng)機鋼管樁結(jié)構(gòu)工程特性的防腐優(yōu)化設(shè)計方案，并對東海大橋海上風(fēng)電場3MW風(fēng)機鋼管樁進行了優(yōu)化方案詳細設(shè)計，為海上風(fēng)機鋼管樁基礎(chǔ)防腐設(shè)計提供參考依據(jù)。
[Abstract]:Fan foundation is an important part of offshore fan unit. As a permanent building, fan foundation stands in harsh marine corrosion environment for a long time. The anticorrosion design is related to the safe use of the fan's structural foundation. The structural reliability analysis is only carried out during the design life of the fan's foundation. So far, the corrosion problem of offshore fan steel pipe pile foundation has not been solved very well. This paper is based on the doctoral Program Project of the Ministry of Education, 20125522110004) and the key project of Chongqing Natural Science Foundation, CSTC2013jjB3002). Based on the engineering background of Shanghai Donghai Bridge Offshore Wind Power Project, and on the basis of previous studies, The corrosion resistance of offshore fan steel pipe pile foundation is studied by means of theoretical analysis and numerical simulation. The main contents and results are as follows:. 1) taking the offshore wind farm of Donghai Bridge as the engineering background, the main environmental load calculation method and load combination of offshore fan foundation are analyzed. The load calculation of steel pipe pile foundation of 3 MW offshore fan under normal operation condition and ultimate load condition is carried out. According to the pile-soil interaction mechanism, P-y curve method is used to simulate the nonlinear behavior of pile-soil contact. The P-y curve data of blower steel pipe pile foundation soil are obtained by using stratigraphic data, which provides load data and boundary data for the strength and stability reduction analysis of fan steel pipe pile under the influence of corrosion. 2) through the analysis of corrosion type and corrosion mechanism of steel structure in marine environment, it is concluded that corrosion crack propagation of offshore fan steel pipe pile foundation is the result of the joint action of anodic dissolution and surface film rupture. It lays a theoretical foundation for studying the development law of corrosion rate of offshore fan steel pipe pile and the influence of corrosion on the strength and stability of pile foundation. 3) by analyzing the existing mathematical models of corrosion of marine steel structures, a mathematical model of uniform corrosion in accordance with the foundation of offshore fan steel pipe piles is established as a nonlinear corrosion model considering the joint action of corrosion protection system and corrosion environment. Based on the analysis of soil material and constitutive model of fan steel pipe pile, the 3D finite element model of offshore fan pipe pile foundation under corrosion condition is established, and the uniform corrosion and local corrosion of fan pipe pile are simulated by finite element method. The reduction law of strength and stability of blower steel pipe pile under different corrosion forms is obtained. 4) synthetically simulates the corrosion analysis result, contrasts the conventional anticorrosive design thought and the anticorrosive measure of the offshore fan steel pipe pile, puts forward the anticorrosion optimization design plan according to the offshore fan steel pipe pile structure engineering characteristic. The optimization scheme of 3MW fan steel pipe pile in Donghai Bridge offshore wind farm is designed in detail, which provides a reference for the anticorrosion design of offshore fan steel pipe pile foundation.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU476

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