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

Xinyi Yang, Hong Zhou, Lei Wang, Jiancheng Liu, Hongfei Zhang

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.

https://dx.doi.org/10.31873/IJEAS/6.3.2019.05