基于ANSYS的自复位海洋平台稳定承载力分析
发布时间：2018-09-11 15:58
【摘要】：虽然我国国民经济和综合国力不断提升,然而在全球能源紧缺的实际背景下,海上资源的利用是当今各国重点发展的重点,国家提出大力发展蓝色海洋战略计划,这离不开海上资源开采的重要基础性结构-海洋平台,作为石油开发的基础性设施,其结构设计的好坏将直接影响员工的安全和整个工程的经济效益。鉴于海洋平台的重要性,且海洋平台属于复杂钢结构体系,其稳定承载力验算是承载力验算的重要组成部分,对其研究是非常必要的。如果设计不合理,容易造成平台钢结构出现整体失稳或局部失稳的现象,严重时甚至坍塌,这会造成极大的人员伤亡和经济损失,所以应引起足够重视。本文利用有限元软件ANSYS对JZ20-2北高点井口导管架平台分别进行静力稳定承载力分析和和动力稳定承载力分析,为海洋平台结构稳定性能分析和研究提供一些有价值的参考,本文主要的具体工作如下:(1)通过自复位摇摆结构体系,建立新型的自复位海洋平台结构体系,并利用有限元软件ANSYS建立模型,分析静力稳定性能。首先对原海洋平台结构进行静力线性特征值屈曲分析,再分别对自复位摇摆柱海洋平台和自复位拉索海洋平台进行静力线性特征值屈曲分析,得到屈曲模态和屈曲临界荷载,与原海洋平台进行对比分析;其次再试图改变内部结构杆件参数来分析稳定性的变化规律,为后续的非线性稳定、动力稳定性研究提供基础;最后,基于静力分析,采用非线性有限元的分析方法,同时考虑几何、材料双重非线性的影响,对结构进行整体稳定性分析,得到荷载-位移曲线和极限承载力,分析结构塑性发展状况,发现海洋平台结构为较敏感结构。(2)进行了自复位摇摆柱海洋平台结构体系在地震荷载和动冰荷载作用下的动力稳定性。根据动力响应全过程曲线判定准则,分析摇摆柱-海洋平台结构在多种地震荷载和挤压冰、弯曲冰下的动力稳定性,判定结构失稳临界值,为结构设计提供参考。
[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.
【学位授予单位】：青岛理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU391;P742
本文编号：2237155
[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.
【学位授予单位】：青岛理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU391;P742
【参考文献】
相关期刊论文 前3条
1 岳前进;刘圆;屈衍;时忠民;;抗冰平台的冰振疲劳分析[J];工程力学;2007年06期
2 沈祖炎,叶继红;运动稳定性理论在结构动力分析中的应用[J];工程力学;1997年03期
3 王策,沈世钊;单层球面网壳结构动力稳定分析[J];土木工程学报;2000年06期
相关硕士学位论文 前1条
1 高宇;双重弯剪型抗侧力体系的相互作用[D];浙江大学;2006年
，本文编号：2237155
本文链接：https://www.wllwen.com/kejilunwen/haiyang/2237155.html
