發(fā)布時(shí)間：2018-01-26 18:28

  本文關(guān)鍵詞： FPSO 剩余極限強(qiáng)度 試驗(yàn)研究 非線(xiàn)性有限元分析 穿透裂紋 加筋板　出處：《江蘇科技大學(xué)》2015年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：船舶與海洋工程結(jié)構(gòu)在服役期間發(fā)生的災(zāi)難性斷裂事故不僅嚴(yán)重危害了工作人員的人身安全,而且會(huì)造成巨大的經(jīng)濟(jì)損失。因此海洋工程設(shè)計(jì)師開(kāi)始探求新的船舶與海洋工程結(jié)構(gòu)設(shè)計(jì)思想,正確評(píng)估其結(jié)構(gòu)極限強(qiáng)度,尤其是具有裂紋缺陷影響的鋼結(jié)構(gòu)剩余極限強(qiáng)度的研究引起了船舶及海洋工程領(lǐng)域?qū)W者的極大興趣。本文針對(duì)含裂紋加筋板在壓縮載荷下的剩余極限強(qiáng)度、屈曲模式及裂紋應(yīng)力強(qiáng)度因子做了系統(tǒng)的分析總結(jié),綜合考察了不同裂紋參數(shù),載荷參數(shù)以及初始變形缺陷對(duì)加筋板剩余壓縮極限強(qiáng)度的影響,并在此基礎(chǔ)上對(duì)含裂紋FPSO復(fù)雜結(jié)構(gòu)的剩余極限強(qiáng)度進(jìn)行了初步探討。具體研究?jī)?nèi)容如下:(1)采用試驗(yàn)法對(duì)含裂紋損傷加筋板的壓縮剩余極限強(qiáng)度進(jìn)行研究。設(shè)計(jì)六種典型的穿透裂紋損傷加筋板,對(duì)試件進(jìn)行軸向壓縮試驗(yàn)。通過(guò)改變模型裂紋尺寸、位置及傾角參數(shù),觀測(cè)試驗(yàn)數(shù)據(jù),探討了不同裂紋參數(shù)影響下的加筋板破壞特點(diǎn)和對(duì)剩余極限強(qiáng)度影響。試驗(yàn)結(jié)果表明,不同的裂紋長(zhǎng)度以及裂紋位置改變加筋板結(jié)構(gòu)承載力的分布,影響結(jié)構(gòu)應(yīng)力應(yīng)變場(chǎng),進(jìn)而改變其失效崩潰模式;初始缺陷對(duì)結(jié)構(gòu)的剩余極限強(qiáng)度的影響也不容忽視。(2)探討一種數(shù)值與試驗(yàn)相結(jié)合的受裂紋損傷加筋板結(jié)構(gòu)極限強(qiáng)度研究方法。采用非線(xiàn)性有限元分析法,考慮初始變形缺陷下對(duì)受軸向壓縮載荷的含穿透裂紋加筋板的極限強(qiáng)度進(jìn)行分析,分別探討存在初始變形缺陷,裂紋位置、長(zhǎng)度不同時(shí)加筋板結(jié)構(gòu)應(yīng)力分布特性及屈曲變形模式,并與試驗(yàn)結(jié)果進(jìn)行對(duì)比分析,結(jié)果較為吻合。并計(jì)算裂紋加筋板裂紋尖端應(yīng)力強(qiáng)度因子,使用K判據(jù)判斷裂紋是否擴(kuò)展,探討加載過(guò)程中裂紋尖端的應(yīng)力場(chǎng)的變化。(3)為研究含裂紋損傷加筋板剩余極限強(qiáng)度的邊界影響,以單條筋雙跨加筋板和三條筋雙跨加筋板為研究對(duì)象,采用非線(xiàn)性有限元法開(kāi)展其極限強(qiáng)度分析。考慮結(jié)構(gòu)的初始變形缺陷,對(duì)比分析承受軸向壓縮、同時(shí)承受軸向壓縮和側(cè)向壓力聯(lián)合作用時(shí)加筋板的剩余極限強(qiáng)度,給出不同裂紋位置和裂紋長(zhǎng)度加筋板剩余承載力的變化規(guī)律。結(jié)果表明,單條加筋板的剩余極限強(qiáng)度偏小,三條加筋模型的計(jì)算結(jié)果更接近于真實(shí)情況,邊界對(duì)于含裂紋損傷加筋板結(jié)構(gòu)的極限強(qiáng)度分析模型影響較大。側(cè)向壓力的存在相當(dāng)于增加了主板的轉(zhuǎn)動(dòng)約束,改變了整個(gè)加筋板結(jié)構(gòu)的應(yīng)力響應(yīng),降低了結(jié)構(gòu)的極限強(qiáng)度。(4)研究裂紋對(duì)FPSO船體結(jié)構(gòu)的極限強(qiáng)度的影響。采用非線(xiàn)性有限元法對(duì)FPSO船體結(jié)構(gòu)進(jìn)行分析,比較單跨距和三跨距完整船體結(jié)構(gòu)的極限彎矩,在此基礎(chǔ)上,得到在中拱/中垂?fàn)顟B(tài)下,裂紋在甲板、艙底以及兩處同時(shí)存在裂紋時(shí)FPSO結(jié)構(gòu)的應(yīng)力、應(yīng)變分布以及極限彎矩變化規(guī)律。
[Abstract]:The cataclysmic fracture of ship and marine engineering structure during service not only seriously endangers the personal safety of the staff. And will cause huge economic losses, so the marine engineering designers began to explore a new ship and marine engineering structure design ideas, the correct evaluation of the ultimate strength of the structure. In particular, the study of residual ultimate strength of steel structures with crack defects has aroused great interest of the scholars in the field of ship and marine engineering. In this paper, the residual ultimate strength of stiffened plates with cracks under compression load is studied. The buckling mode and crack stress intensity factor are systematically analyzed and summarized. The effects of different crack parameters, load parameters and initial deformation defects on the residual compressive ultimate strength of stiffened plates are comprehensively investigated. On this basis, the residual ultimate strength of FPSO structures with cracks is preliminarily discussed. The specific research contents are as follows: 1). The compressive residual ultimate strength of stiffened plates with crack damage is studied by means of experimental method. Six typical stiffened plates with crack penetrating damage are designed. The axial compression test was carried out on the specimen. The experimental data were observed by changing the model crack size, position and dip angle parameters. The failure characteristics of stiffened plate under different crack parameters and its influence on residual ultimate strength are discussed. The experimental results show that different crack length and crack location change the distribution of bearing capacity of stiffened plate structure. The stress and strain field of the structure is affected and the failure collapse mode is changed. The influence of initial defects on the residual ultimate strength of the structure can not be ignored. (2) A numerical and experimental method for studying the ultimate strength of cracked stiffened plate structures is discussed. The nonlinear finite element analysis method is used. Considering the initial deformation defect, the ultimate strength of the stiffened plate with penetrating crack under axial compression load is analyzed, and the initial deformation defect and crack location are discussed respectively. The stress distribution characteristics and buckling mode of stiffened plate structure with different length are compared with the experimental results and the stress intensity factor at crack tip of stiffened plate is calculated. The K criterion is used to judge whether the crack is propagating or not, and the change of stress field at the crack tip during loading is discussed as the boundary influence of residual ultimate strength of cracked stiffened plate. The ultimate strength analysis of single-stiffened double-span stiffened plate and three-stiffened double-span stiffened plate is carried out by nonlinear finite element method. Considering the initial deformation defects of the structure, the axial compression is comparatively analyzed. At the same time, the residual ultimate strength of stiffened plates subjected to axial compression and lateral pressure is obtained, and the variation law of residual bearing capacity of stiffened plates with different crack positions and crack lengths is given. The residual ultimate strength of the single stiffened plate is small, and the calculation results of the three stiffened plates are closer to the real situation. The boundary has a great influence on the ultimate strength analysis model of the stiffened plate structure with crack. The existence of lateral pressure is equivalent to increasing the rotation constraint of the main plate and changing the stress response of the whole stiffened plate structure. The influence of crack on the ultimate strength of FPSO hull structure is studied. The nonlinear finite element method is used to analyze the FPSO hull structure. On the basis of comparing the ultimate bending moments of single-span and three-span intact hull structures, the stresses of FPSO structures with cracks in deck, bilge and two places are obtained under the condition of mid-arch / mid-vertical. Strain distribution and variation of ultimate bending moment.
【學(xué)位授予單位】：江蘇科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：U661.43;U674.38

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