本文選題：自升式平臺(tái) + 有限元��； 參考：《大連理工大學(xué)》2016年碩士論文

【摘要】：較深海域的自升式平臺(tái)需要考慮波浪等環(huán)境因素導(dǎo)致的動(dòng)力效應(yīng),海底土體對(duì)樁腿的約束作用在平臺(tái)動(dòng)力響應(yīng)分析中起著非常關(guān)鍵的作用,本文考慮海底土體與樁靴的作用建立了樁土、鉸接、固支和API四種樁基模型,分別應(yīng)用在參考“麥哲倫”號(hào)平臺(tái)建立自升式平臺(tái)有限元?jiǎng)恿δＰ椭?在ANSYS下對(duì)四種模型作模態(tài)分析和瞬態(tài)動(dòng)力分析,比較得到的振動(dòng)頻率、振型和主船體位移等動(dòng)力響應(yīng),驗(yàn)證了樁土樁基模型在平臺(tái)動(dòng)力響應(yīng)分析中應(yīng)用的有效性和合理性。使用單自由度法和時(shí)域分析法計(jì)算了平臺(tái)動(dòng)力放大系數(shù)DAF,比較不同波浪周期下兩種方法計(jì)算DAF的差異,分析和總結(jié)差異產(chǎn)生的有原因。本文的樁土樁基模型中非常重要的參數(shù)有土體不排水抗剪強(qiáng)度、土體建模范圍和樁靴最大直徑,本文分別研究上述參數(shù)對(duì)自振頻率、主船體位移和動(dòng)力放大系數(shù)DAF等平臺(tái)動(dòng)力響應(yīng)的影響,分析總結(jié)不同參數(shù)下動(dòng)力響應(yīng)的變化規(guī)律,根據(jù)結(jié)果對(duì)樁基建模和樁靴直徑選取提出了一些建議。本文分析了樁土樁基平臺(tái)有限元模型下,平臺(tái)結(jié)構(gòu)幾何非線性P-△效應(yīng)對(duì)平臺(tái)動(dòng)力響應(yīng)分析的影響,證明P-△效應(yīng)對(duì)平臺(tái)自振頻率、主船體位移和動(dòng)力放大系數(shù)等動(dòng)力響應(yīng)有不可忽視的作用,應(yīng)該在自升式平臺(tái)有限元?jiǎng)恿δＰ椭袦?zhǔn)確考慮。
[Abstract]:The dynamic effect caused by wave and other environmental factors should be considered in the jack-up platform in deep sea area, and the restraint action of the bottom soil on the pile leg plays a very important role in the dynamic response analysis of the platform. In this paper, considering the interaction between submarine soil and pile boots, four pile foundation models, pile soil, hinge, fixed support and API, are established and applied to the finite element dynamic model of jack-up platform with reference to "Magellan" platform, respectively. The modal analysis and transient dynamic analysis of the four models are carried out under ANSYS. The dynamic responses such as vibration frequency, vibration mode and displacement of the main hull are compared, which verifies the validity and rationality of the pile-soil pile model applied in the dynamic response analysis of the platform. The dynamic magnification factor (DAF) of the platform is calculated by using the single degree of freedom method and the time domain analysis method. The difference of DAF between the two methods under different wave periods is compared, and the reasons for the difference are analyzed and summarized. In this paper, the most important parameters of pile-soil pile foundation model are undrained shear strength, modeling range and maximum diameter of pile boots. The influence of the displacement of the main hull and the dynamic magnification factor (DAF) on the dynamic response of the platform is analyzed and summarized. Based on the results, some suggestions on the pile foundation modeling and the selection of the diameter of the pile shoe are put forward. In this paper, the influence of the geometric nonlinear P- effect of the platform structure on the dynamic response of the platform under the finite element model of pile-soil pile foundation platform is analyzed, and it is proved that the P- effect affects the natural vibration frequency of the platform. The dynamic responses such as the displacement of the main hull and the dynamic magnification factor can not be ignored and should be considered accurately in the finite element dynamic model of the jack-up platform.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：U674.38

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本文編號(hào)：2052457