本文選題：導(dǎo)管架海洋平臺(tái)　切入點(diǎn)：管節(jié)點(diǎn)局部柔度　出處：《煙臺(tái)大學(xué)》2017年碩士論文

【摘要】：焊接導(dǎo)管架海洋平臺(tái)因其結(jié)構(gòu)簡(jiǎn)單、適應(yīng)性強(qiáng)、安全可靠等優(yōu)點(diǎn)已成為我國(guó)淺海地區(qū)的主要油氣開(kāi)采平臺(tái)。作為建造導(dǎo)管架海洋平臺(tái)的主體建筑材料,鋼材的彈性模量及屈服強(qiáng)度在高溫下都會(huì)有較大程度的下降,嚴(yán)重威脅導(dǎo)管架海洋平臺(tái)在火災(zāi)條件下的安全性能及生存能力。目前導(dǎo)管架海洋平臺(tái)火災(zāi)條件下的有限元研究主要有以下兩種方式,一是通過(guò)實(shí)體單元或殼單元建立海洋平臺(tái)整體模型進(jìn)行抗火分析,二是將導(dǎo)管架海洋平臺(tái)簡(jiǎn)化為空間梁?jiǎn)卧?弦管與支管視為剛結(jié),不考慮管節(jié)點(diǎn)的局部變形。前者精度較高但耗時(shí)長(zhǎng)、代價(jià)高昂,后者分析快,但無(wú)法準(zhǔn)確反映節(jié)點(diǎn)的局部柔性效應(yīng)。本文在局部柔度的基礎(chǔ)上,提出了一種抗火虛擬梁?jiǎn)卧?并將其引入導(dǎo)管架海洋平臺(tái)的有限元分析模型中進(jìn)行局部火災(zāi)作用下的失效分析。首先,在管節(jié)點(diǎn)局部柔度的基礎(chǔ)上,提出了抗火虛擬梁?jiǎn)卧母拍睢？够鹛摂M梁?jiǎn)卧O(shè)置于弦管與支管相交處,方向垂直于弦管軸線,長(zhǎng)度為弦管的半徑。將節(jié)點(diǎn)區(qū)域隔離出來(lái),分別以鋼材在不同溫度下對(duì)應(yīng)的本構(gòu)關(guān)系曲線進(jìn)行材料定義,建立節(jié)點(diǎn)區(qū)域的有限元靜力分析模型。通過(guò)將分析得到的不同溫度下的荷載變形曲線進(jìn)行轉(zhuǎn)換,得到抗火虛擬梁?jiǎn)卧诟邷叵碌膽?yīng)力應(yīng)變曲線。對(duì)5個(gè)T型節(jié)點(diǎn)平面管桁架及3個(gè)Y型節(jié)點(diǎn)平面管桁架分別建立了殼單元瞬態(tài)有限元模型、傳統(tǒng)剛結(jié)瞬態(tài)有限元模型及引入了抗火虛擬梁?jiǎn)卧腇BE瞬態(tài)有限元模型。對(duì)三種模型分析得到的加載點(diǎn)溫度位移曲線進(jìn)行了對(duì)比,結(jié)果表明傳統(tǒng)的剛結(jié)模型不能準(zhǔn)確地反應(yīng)管桁架的在火災(zāi)作用下的位移,且會(huì)過(guò)高的估計(jì)結(jié)構(gòu)的抗火能力。采用了抗火虛擬梁?jiǎn)卧腇BE模型分析所得的溫度位移曲線則與殼單元模型分析結(jié)果吻合較好,其對(duì)于管桁架的結(jié)構(gòu)失效溫度的預(yù)測(cè)與剛結(jié)模型相比也更加接近殼單元模型的分析結(jié)果。針對(duì)于管桁架結(jié)構(gòu),選取了不同火災(zāi)工況,對(duì)抗火虛擬梁?jiǎn)卧诰植炕馂?zāi)條件下的適用性進(jìn)行了研究。采用抗火虛擬梁?jiǎn)卧獙?duì)勝利油田CB25A井組中的井口平臺(tái)進(jìn)行了局部火災(zāi)作用下的失效分析,針對(duì)不同的火災(zāi)工況,對(duì)平臺(tái)的結(jié)構(gòu)響應(yīng)進(jìn)行了研究,為焊接導(dǎo)管架海洋平臺(tái)的抗火設(shè)計(jì)提供了依據(jù)。
[Abstract]:Welding jacket offshore platform has become the main oil and gas exploitation platform in shallow sea area of China because of its simple structure, strong adaptability, safety and reliability. The elastic modulus and yield strength of steel will decrease to a large extent at high temperature. The safety performance and survivability of jacket offshore platforms under fire conditions are seriously threatened. At present, the finite element analysis of jacket offshore platforms under fire conditions mainly includes the following two ways. First, the integral model of offshore platform is established by entity element or shell element for fire resistance analysis; second, the jacket offshore platform is simplified into a space beam element, and chord and branch tubes are regarded as rigid junction. The former has high precision, long time consuming and high cost, but the latter can not accurately reflect the local flexibility effect of the joints. Based on the local flexibility, a fire resistant virtual beam element is proposed in this paper. It is introduced into the finite element analysis model of jacket offshore platform for failure analysis under the action of local fire. Firstly, based on the local flexibility of pipe joints, The concept of fire resistant virtual beam element is put forward. The fire resistant virtual beam element is arranged at the intersection of chord and branch, perpendicular to the axis of chord, and the length is the radius of chord. The finite element static analysis model of the joint region is established by defining the constitutive relation curves of steel at different temperatures, and the load deformation curves at different temperatures are transformed by the finite element static analysis model. The stress-strain curves of fire resistant virtual beam elements at high temperature were obtained. The transient finite element models of shell elements were established for five T-joints planar tube trusses and three Y-joint planar tubular trusses. The traditional rigid-junction transient finite element model and the FBE transient finite element model with fire resistant virtual beam element are introduced. The results show that the traditional rigid-junction model can not accurately reflect the displacement of pipe truss under fire. The temperature displacement curve obtained by the FBE model of fire resistance virtual beam element is in good agreement with the shell element model. The prediction of failure temperature of pipe truss structure is closer to the analysis result of shell element model than rigid junction model. Different fire conditions are selected for pipe truss structure. The applicability of anti-fire virtual beam element under local fire condition is studied. The failure analysis of the wellhead platform in CB25A well group in Shengli Oilfield under local fire condition is carried out by using the anti-fire virtual beam element, and the failure analysis is carried out under different fire conditions. The structural response of the platform is studied, which provides the basis for the fire resistance design of the welded jacket offshore platform.
【學(xué)位授予單位】：煙臺(tái)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TE95

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 王皓;邵永波;;考慮節(jié)點(diǎn)柔度的空心圓鋼管桁架的簡(jiǎn)化分析模型[J];四川理工學(xué)院學(xué)報(bào)(自然科學(xué)版);2016年06期

2 趙海成;邵永波;楊冬平;;高溫環(huán)境中主管軸力對(duì)焊接圓鋼管T節(jié)點(diǎn)承載性能的影響[J];海洋工程;2016年06期

3 逯寧;;考慮節(jié)點(diǎn)局部柔度的鋼管結(jié)構(gòu)靜力性能研究[J];山西建筑;2016年05期

4 張紅燕;邵永波;何樹(shù)賓;楊杰;;主管管壁加厚的T型圓鋼管節(jié)點(diǎn)抗火性能有限元研究[J];煙臺(tái)大學(xué)學(xué)報(bào)(自然科學(xué)與工程版);2014年02期

5 鞠竹;韓玉來(lái);董惠;王振清;;鋼框架在火災(zāi)作用下的結(jié)構(gòu)失效過(guò)程分析[J];華中科技大學(xué)學(xué)報(bào)(自然科學(xué)版);2013年07期

6 陳成;邵永波;楊杰;;T型圓鋼管節(jié)點(diǎn)抗火性能的有限元研究[J];工程力學(xué);2013年01期

7 高飛;關(guān)興泉;吳志高;陸恩旭;;Y型圓鋼管節(jié)點(diǎn)耐火性能的有限元分析[J];土木工程與管理學(xué)報(bào);2012年01期

8 于文靜;趙金城;龔景海;史健勇;;T型相貫節(jié)點(diǎn)在爆炸沖擊和火災(zāi)作用下力學(xué)性能的有限元分析[J];上海交通大學(xué)學(xué)報(bào);2012年02期

9 宋雪飛;陸建輝;;海洋平臺(tái)池火火災(zāi)模型概述[J];石油工程建設(shè);2011年02期

10 靳猛;趙金城;常靜;劉明路;;導(dǎo)管架海洋平臺(tái)梁柱節(jié)點(diǎn)抗火承載力研究[J];建筑結(jié)構(gòu);2010年07期

相關(guān)碩士學(xué)位論文 前4條

1 藍(lán)小藝;內(nèi)置環(huán)肋圓鋼管相貫節(jié)點(diǎn)高溫破壞機(jī)理與極限承載力研究[D];華南理工大學(xué);2016年

2 陳成;焊接圓鋼管節(jié)點(diǎn)抗火性能研究[D];煙臺(tái)大學(xué);2013年

3 李豐亭;火災(zāi)作用下CⅡ海洋平臺(tái)的承載能力分析[D];中國(guó)海洋大學(xué);2008年

4 倪偉健;火災(zāi)作用下海洋平臺(tái)結(jié)構(gòu)失效機(jī)理和風(fēng)險(xiǎn)評(píng)估[D];浙江大學(xué);2006年

，

本文編號(hào)：1673544