本文選題：LNG儲罐 + 樁��； 參考：《天津大學》2014年碩士論文

【摘要】：隨著清潔能源在世界范圍內(nèi)得到重視,LNG(Liquefied Natural Gas)的需求量與日俱增。LNG儲罐是LNG接收站的核心,目前最常見的類型為高樁承臺基礎(chǔ)的預(yù)應(yīng)力混凝土全容式儲罐。國內(nèi)目前已建或在建的大型LNG儲罐均由國外公司主要設(shè)計、建造。LNG儲罐的基礎(chǔ)在項目總造價中占很大的比重,是影響結(jié)構(gòu)是否安全的重要部位。探究如何能更好地進行大型全容式LNG儲罐優(yōu)化設(shè)計,對于提升我國自主設(shè)計、建造能力,推動LNG儲罐向超大型化發(fā)展,以及促進我國國民經(jīng)濟的發(fā)展具有重大的戰(zhàn)略意義和經(jīng)濟意義。本課題主要參考國內(nèi)外關(guān)于LNG儲罐及樁的相關(guān)規(guī)范,并借助ANSYS有限元分析軟件,對LNG儲罐樁的優(yōu)化設(shè)計進行研究。本文的主要研究內(nèi)容及結(jié)論如下:1.參考不同國家的相關(guān)規(guī)范,總結(jié)其對LNG儲罐樁的相關(guān)要求,并對樁剛度的計算方法進行比較。根據(jù)中國規(guī)范和日本規(guī)范分別計算樁的靜剛度和動剛度,得出樁剛度動力放大系數(shù)的變化規(guī)律。2.對比ANSYS中關(guān)于樁的不同模擬方法,證明本文所選的方法與試樁試驗結(jié)果較接近,滿足分析精度的要求。3.建立16萬m3LNG儲罐的整體殼單元模型,探究在不同單一荷載作用下,不同樁剛度的LNG儲罐的上部結(jié)構(gòu)的反應(yīng)情況。結(jié)果表明:在單一荷載作用下,當結(jié)構(gòu)以豎向變形為主時,內(nèi)力大小主要受樁的豎向剛度大小的影響;在風荷載、溫度作用、有效預(yù)應(yīng)力作用下,結(jié)構(gòu)內(nèi)力大小同時受樁的豎向剛度與水平剛度的影響。4.建立16萬m3LNG儲罐1/4實體單元模型,考慮自重及附件重、長期有效預(yù)應(yīng)力、正常操作氣壓、靜液壓作用、均布活荷載,通過變化樁距(樁徑、樁數(shù))、樁長、截面形狀、環(huán)樁圈數(shù)、剛度分布、布置形狀等參數(shù),比較樁和底板的位移和應(yīng)力變化情況�；谒玫降囊�(guī)律,提出樁的優(yōu)化設(shè)計方案,并驗證該方案大部分適用于超大容積的LNG儲罐,但由于樁體最大應(yīng)力的位置發(fā)生變化,關(guān)于截面形狀的結(jié)論不適用。
[Abstract]:With the increasing demand for clean energy in the world, the Natural storage tank is the core of the LNG receiving station. At present, the most common type is the prestressed concrete full-capacity storage tank with high pile cap foundation. At present, large scale LNG storage tanks have been built or are under construction in China, which are mainly designed by foreign companies. The foundation of constructed .LNG tanks accounts for a large proportion of the total cost of the project, and is an important part of the safety of the structure. To explore how to better carry out the optimization design of large full-capacity LNG storage tank, to promote the independent design and construction ability of our country, and to promote the development of LNG storage tank to super large scale. And promote the development of our national economy has great strategic and economic significance. This paper mainly refers to the relevant codes of LNG tanks and piles at home and abroad, and studies the optimization design of LNG tank piles with the help of ANSYS finite element analysis software. The main contents and conclusions of this paper are as follows: 1. Referring to the relevant codes of different countries, this paper summarizes the relevant requirements of LNG tank pile, and compares the calculation methods of pile stiffness. According to Chinese and Japanese codes, the static stiffness and dynamic stiffness of pile are calculated, and the variation rule of dynamic magnification factor of pile stiffness is obtained. Comparing with the different simulation methods of pile in ANSYS, it is proved that the method chosen in this paper is close to the test result of pile test and meets the requirement of analysis precision. The integral shell element model of 160000 m3LNG storage tank was established to investigate the response of the superstructure of LNG tank with different pile stiffness under different single loads. The results show that under a single load, the internal force is mainly affected by the vertical stiffness of the pile when the structure is dominated by vertical deformation, and under the action of wind load, temperature and effective prestress, the internal force is mainly affected by the vertical stiffness of the pile. The internal force of the structure is affected by both the vertical and horizontal stiffness of the pile. The 1 / 4 solid element model of 160000 m3LNG storage tank was established, considering the weight and accessory weight, long-term effective prestress, normal operating pressure, hydrostatic action, uniform distribution of live load, and by changing pile spacing (pile diameter, pile number, pile length, section shape, ring pile circle number). Stiffness distribution, layout shape and other parameters to compare the displacement and stress of pile and floor. Based on the obtained rules, the optimal design scheme of piles is proposed, and it is verified that most of the schemes are suitable for LNG tanks with very large volume. However, due to the change of the position of the maximum stress of the pile, the conclusion on section shape is not applicable.
【學位授予單位】：天津大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TU473.1;TE972

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本文編號：1929746