【摘要】：“番禺30-1”導(dǎo)管架平臺(tái)位于南海海域,所處海洋環(huán)境極為惡劣。加之該平臺(tái)體積龐大,結(jié)構(gòu)復(fù)雜,桿件和管結(jié)點(diǎn)數(shù)目眾多,所以對(duì)其進(jìn)行風(fēng)險(xiǎn)評(píng)估對(duì)于平臺(tái)的安全服役意義重大。首先,本文對(duì)“番禺30-1”導(dǎo)管架平臺(tái)進(jìn)行極端海洋環(huán)境下的靜力分析。通過Weibull分布擬合得到了南海百年一遇設(shè)計(jì)波要素,并與百年一遇風(fēng)、流組合作為分析環(huán)境,對(duì)平臺(tái)和樁腿進(jìn)行靜力分析。根據(jù)分析結(jié)果,本文對(duì)上部組塊以及樁腿的應(yīng)力和位移進(jìn)行了分析,并使用SESAM軟件的規(guī)范校核方法對(duì)導(dǎo)管架桿件和管節(jié)點(diǎn)進(jìn)行規(guī)范校核,從而對(duì)平臺(tái)在極端海況下的安全狀態(tài)進(jìn)行全面地評(píng)估。研究表明平臺(tái)甲板、樁腿和導(dǎo)管架在極端海況下的力學(xué)性能均滿足安全要求。然后,本文使用ANSYS軟件的瞬態(tài)分析方法,對(duì)“番禺30-1”導(dǎo)管架平臺(tái)進(jìn)行了極端海況下的動(dòng)態(tài)特性分析。首先進(jìn)行自振特性分析,得到結(jié)構(gòu)的自振周期不會(huì)與波浪周期發(fā)生共振。在此基礎(chǔ)上進(jìn)行瞬態(tài)分析,得到了單元的應(yīng)力、位移時(shí)程曲線,以此對(duì)平臺(tái)在極端海況下的動(dòng)態(tài)特性進(jìn)行安全評(píng)估。其次,本文對(duì)“番禺30-1”導(dǎo)管架平臺(tái)進(jìn)行了隨機(jī)波環(huán)境下的疲勞損傷分析。瞬態(tài)分析得到9個(gè)代表點(diǎn)的應(yīng)力時(shí)程曲線后,利用有限元方法反推求得各個(gè)代表點(diǎn)的應(yīng)力集中系數(shù),進(jìn)而得到熱點(diǎn)應(yīng)力時(shí)程曲線,并使用雨流統(tǒng)計(jì)法進(jìn)行應(yīng)力幅值統(tǒng)計(jì)。選用DNV規(guī)范推薦的T型S-N曲線,按照Miner線性累計(jì)理論,計(jì)算9個(gè)代表點(diǎn)的年疲勞損傷量,對(duì)平臺(tái)在作業(yè)工況下的疲勞壽命進(jìn)行評(píng)估。研究表明9個(gè)代表點(diǎn)的疲勞壽命均滿足要求。再次,本文就平臺(tái)的腐蝕疲勞、海生物附著問題進(jìn)行定量分析和評(píng)估,通過分析發(fā)現(xiàn)腐蝕會(huì)加劇結(jié)構(gòu)疲勞,海生物附著則會(huì)增大結(jié)構(gòu)受力。根據(jù)這一結(jié)論,本文提出了相應(yīng)的解決措施,并給出了進(jìn)行海生物清理的附著厚度最大值。最后,本文對(duì)船舶靠泊時(shí)平臺(tái)的受力情況進(jìn)行計(jì)算分析,從正向靠泊和側(cè)向靠泊兩方面進(jìn)行分析和研究,結(jié)果表明側(cè)向靠泊比正向靠泊更偏于安全;從平臺(tái)強(qiáng)度和設(shè)備安全方面分析,對(duì)船舶側(cè)向靠泊時(shí)最大法向靠泊速度和無護(hù)舷情況下船舶靠泊最大法向靠泊速度給出了建議值,對(duì)安全的船舶靠泊提供指導(dǎo)。
[Abstract]:Panyu 30-1 jacket platform is located in the South China Sea, where the marine environment is extremely harsh. In addition, the platform is huge in volume, complex in structure, and has a large number of member and pipe nodes, so risk assessment is of great significance for the safe service of the platform. Firstly, the static analysis of "Panyu 30-1" jacket platform under extreme marine environment is carried out in this paper. The design wave elements of once-in-a-hundred years in the South China Sea are obtained by Weibull distribution fitting, and the static analysis of the platform and pile leg is carried out with the combination of wind and flow as the analysis environment. According to the analysis results, the stress and displacement of upper block and pile leg are analyzed in this paper, and the standard check method of SESAM software is used to check the jacket member and pipe joint. Thus, the safety status of the platform under extreme sea conditions is comprehensively evaluated. The results show that the mechanical properties of platform deck, pile legs and jackets meet the safety requirements under extreme sea conditions. Then, using the transient analysis method of ANSYS software, the dynamic characteristics of "Panyu 30-1" jacket platform under extreme sea conditions are analyzed. First, the natural vibration characteristics of the structure are analyzed and the results show that the natural period of the structure will not resonate with the wave period. Based on the transient analysis, the stress and displacement time-history curves of the element are obtained, which can be used to evaluate the dynamic characteristics of the platform under extreme sea conditions. Secondly, the fatigue damage analysis of "Panyu 30-1" jacket platform under random wave environment is carried out in this paper. After the stress time history curves of nine representative points are obtained by transient analysis, the stress concentration coefficients of each representative point are obtained by using the finite element method, and then the hot spot stress time history curves are obtained, and the stress amplitude statistics are carried out by using the rain flow statistics method. According to Miner's linear accumulative theory, the annual fatigue damage of nine representative points is calculated according to the T-type S _ (N) curve recommended by DNV Code, and the fatigue life of the platform under working conditions is evaluated. The results show that the fatigue life of 9 representative points meets the requirements. Thirdly, the corrosion fatigue and marine adhesion of the platform are quantitatively analyzed and evaluated. It is found that the corrosion will aggravate the structural fatigue, and the marine adhesion will increase the stress of the structure. Based on this conclusion, this paper puts forward the corresponding solutions and gives the maximum value of attachment thickness for marine biological clean-up. Finally, the force of the platform when the ship is berthing is calculated and analyzed in two aspects: forward berthing and lateral berthing. The results show that lateral berthing is safer than forward berthing. Based on the analysis of platform strength and equipment safety, the maximum normal berthing speed in lateral berthing and the maximum normal mooring speed in the absence of fenders are proposed, which can provide guidance for safe berthing.
【學(xué)位授予單位】：中國石油大學(xué)(華東)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TE95

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本文編號(hào)：2434776