基于固有应变的海洋平台典型结构焊接变形预测

针对半潜式起重拆解平台，运用热弹塑性有限元分析和弹性有限元法，对平台中连接平台和浮体的典型结构，进行焊接变形的预测。通过对焊接接头的预测分析，得到其固有变形，再将计算得到的固有变形，以载荷的形式加载到整个结构中，得到整个结构的焊接变形。通过对三种焊接顺序的比较，得到焊接变形最小的方案。在此基础上，考虑开口对结构焊接变形的影响。研究结果将对半潜式起重拆解平台特殊结构的焊接工艺优化提供理论支撑和数据支持。

Welding Deformation Prediction of Typical offshore Platform Structures Based on Inherent Strain

Aiming at the semi-submersible lifting platform, based on the thermo-elastic-plastic finite element analysis, the elastic finite element method is used to predict the welding instability deformation and control the welding deformation of the connecting platform and floating body in the platform. Through the prediction and analysis of welded joints, the inherent deformation is obtained, and then the calculated inherent deformation is loaded into the whole structure in the form of load, and the welding deformation of the whole structure is obtained. Then, by comparing the welding sequence, the scheme of minimum welding deformation is obtained. Then the opening of the structure is compared, and the influence of the opening on the welding deformation of the structure is analyzed. It is used in the welding process of special structure of semi-submersible lifting and disassembly platform to realize the precision control of welding and ensure the welding quality, construction accuracy and strength performance.