【摘要】：雖然我國國民經(jīng)濟和綜合國力不斷提升,然而在全球能源緊缺的實際背景下,海上資源的利用是當今各國重點發(fā)展的重點,國家提出大力發(fā)展藍色海洋戰(zhàn)略計劃,這離不開海上資源開采的重要基礎性結(jié)構(gòu)-海洋平臺,作為石油開發(fā)的基礎性設施,其結(jié)構(gòu)設計的好壞將直接影響員工的安全和整個工程的經(jīng)濟效益。鑒于海洋平臺的重要性,且海洋平臺屬于復雜鋼結(jié)構(gòu)體系,其穩(wěn)定承載力驗算是承載力驗算的重要組成部分,對其研究是非常必要的。如果設計不合理,容易造成平臺鋼結(jié)構(gòu)出現(xiàn)整體失穩(wěn)或局部失穩(wěn)的現(xiàn)象,嚴重時甚至坍塌,這會造成極大的人員傷亡和經(jīng)濟損失,所以應引起足夠重視。本文利用有限元軟件ANSYS對JZ20-2北高點井口導管架平臺分別進行靜力穩(wěn)定承載力分析和和動力穩(wěn)定承載力分析,為海洋平臺結(jié)構(gòu)穩(wěn)定性能分析和研究提供一些有價值的參考,本文主要的具體工作如下:(1)通過自復位搖擺結(jié)構(gòu)體系,建立新型的自復位海洋平臺結(jié)構(gòu)體系,并利用有限元軟件ANSYS建立模型,分析靜力穩(wěn)定性能。首先對原海洋平臺結(jié)構(gòu)進行靜力線性特征值屈曲分析,再分別對自復位搖擺柱海洋平臺和自復位拉索海洋平臺進行靜力線性特征值屈曲分析,得到屈曲模態(tài)和屈曲臨界荷載,與原海洋平臺進行對比分析;其次再試圖改變內(nèi)部結(jié)構(gòu)桿件參數(shù)來分析穩(wěn)定性的變化規(guī)律,為后續(xù)的非線性穩(wěn)定、動力穩(wěn)定性研究提供基礎;最后,基于靜力分析,采用非線性有限元的分析方法,同時考慮幾何、材料雙重非線性的影響,對結(jié)構(gòu)進行整體穩(wěn)定性分析,得到荷載-位移曲線和極限承載力,分析結(jié)構(gòu)塑性發(fā)展狀況,發(fā)現(xiàn)海洋平臺結(jié)構(gòu)為較敏感結(jié)構(gòu)。(2)進行了自復位搖擺柱海洋平臺結(jié)構(gòu)體系在地震荷載和動冰荷載作用下的動力穩(wěn)定性。根據(jù)動力響應全過程曲線判定準則,分析搖擺柱-海洋平臺結(jié)構(gòu)在多種地震荷載和擠壓冰、彎曲冰下的動力穩(wěn)定性,判定結(jié)構(gòu)失穩(wěn)臨界值,為結(jié)構(gòu)設計提供參考。
[Abstract]:Although China's national economy and overall national strength are constantly improving, under the actual background of global energy shortage, the utilization of marine resources is the key point of the development of various countries today. The state has put forward a strategic plan for the development of the blue ocean. The offshore platform is an important basic structure for offshore resource exploitation. As a basic facility for oil exploitation, the quality of its structure design will directly affect the safety of employees and the economic benefits of the whole project. In view of the importance of offshore platform, and the offshore platform belongs to the complex steel structure system, the checking calculation of its stability bearing capacity is an important part of bearing capacity checking calculation, so it is very necessary to study it. If the design is unreasonable, it is easy to cause the whole instability or partial instability of the steel structure of the platform, and even collapse seriously, which will cause great casualties and economic losses, so we should pay enough attention to it. In this paper, the finite element software ANSYS is used to analyze the static stability bearing capacity and the dynamic stability bearing capacity of the JZ20-2 platform in the north of the well head respectively, which provides some valuable references for the analysis and study of the structural stability of the offshore platform. The main work of this paper is as follows: (1) A new self-reset offshore platform structure system is established by self-reset rocking structure system, and the static stability is analyzed by using finite element software ANSYS. Firstly, the static linear eigenvalue buckling analysis of the original offshore platform structure is carried out, and then the static linear eigenvalue buckling analysis of the self-reset rocking column offshore platform and the self-reset cable offshore platform is carried out, and the buckling mode and critical buckling load are obtained. Compare with the original offshore platform; secondly, try to change the internal structural parameters to analyze the stability of the law, for the subsequent nonlinear stability, dynamic stability research foundation; finally, based on static analysis, By using nonlinear finite element method and considering the influence of geometry and material, the overall stability of the structure is analyzed, the load-displacement curve and ultimate bearing capacity are obtained, and the plastic development of the structure is analyzed. It is found that the offshore platform structure is a more sensitive structure. (2) the dynamic stability of a self-reposition rocking column offshore platform structure system under the action of earthquake load and dynamic ice load is carried out. According to the criterion of determining the whole process curve of dynamic response, the dynamic stability of rocking column-offshore platform structure under various earthquake loads, extruding ice and bending ice is analyzed, and the critical value of structural instability is determined, which provides a reference for structural design.
【學位授予單位】：青島理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TU391;P742

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本文編號：2237155