摘要深海自升式海洋平台是海上油气资源开发的主要工具，如果与船舶发生意外碰撞事故，往往会造成海洋平台结构的损伤甚至失效，带来巨大的经济损失和不良的社会影响，甚至造成不必要的人员伤亡和海洋环境污染。因此，开展深海自升式海洋平台的碰撞性能研究，揭示平台管结构在意外撞击载荷作用下的损伤变形机理，对更好的开展平台耐撞结构设计具有重要的现实意义。87234
本文以深海自升式海洋平台桩腿直管结构为研究对象，采用试验法、简化解析法和有限元数值仿真法对其在侧向冲击载荷作用下的损伤变形机理和能量耗散进行了研究。主要研究内容如下：
（1）开展了管结构冲击模型试验，记录了结构的塑性变形、冲击载荷、跨中塑性位移等数据，分析了两端固支的管结构受侧向冲击载荷时的损伤变形机理；
（2）基于管结构冲击试验，提出两端固支的管结构受侧向冲击载荷作用时的理论塑性变形模式，对其进行解析计算，求出碰撞力与撞深之间的解析表达式；
（3）利用ABAQUS软件对管结构在碰撞过程中的动态响应进行仿真计算，揭示了管结构的损伤变形机理，并将仿真结果与试验数据对比，验证数值仿真技术的正确性及可靠性；
（4）比较仿真和解析计算结果，验证本文所提出的管结构简化解析计算方法的正确性，并对该方法进行了修正。
毕业论文关键字：自升式海洋平台；管结构；碰撞性能；解析计算；冲击试验；数值仿真







Abstract Deep-sea jack-up platform is the major tool for offshore oil and gas resources exploitation, once ship collision accident happened, serious damage and even failure of platform structures will occur, and brings huge economic losses and adverse social impact, further more, unnecessary casualties and the Marine environment pollution。 Since it has the important practical significance for platform structure design about crash worthiness that doing research on deep-sea jack-up platform collision performance and revealing the deformation and damage mechanism of tubular structure in platform under accidental impact loading。
Based on the straight tubular structure of deep-sea jack-up platform legs, the test method, simplified analytic method and finite element numerical simulation method have been applied to analyze the lateral deformation mechanism and energy dissipation of straight tubes under impact loading。 The main research work and conclusions are as follows:
(1) During the circular tube impact test, a mass of data, such as plastic deformation, impact force, plastic displacement have been recorded, and the deformation mechanism of circular tube with both ends clamped under lateral impact load has been analyzed。
(2) Based on the circular tube impact test, the plastic deformation mode of circular tube with both ends clamped under lateral impact load has been proposed。 By carrying on the analytical calculation, the analytical expression between the collision force and impact depth has been obtained。
(3) Using software ABAQUS to conduct simulation calculation about the dynamic response of the tube structure during the collision, which reveals the deformation damage mechanism of tubular structure。 And comparison between the simulation results and the test data verifies the accuracy and reliability of numerical simulation technology。
(4) Comparing the results of simulation and analytic calculation verifies the validity of circular tube in this paper and the error has been corrected。
Key words: jack-up platform; circular tube; collision performance; analytic calculation; impact test; numerical simulation。
目录
第一章  绪论   1
1。1 研究背景及意义   1
1。2 国内外研究现状   2 ABAQUS深海自升式海洋平台管结构碰撞性能研究:http://www.youerw.com/jixie/lunwen_129826.html