基于ANSYS的导管架合拢焊接工艺与抗风安全分析

Analysis of Closure Welding Technology and Wind Resistance Safety for Jacket Structures Using ANSYS

摘要: 针对海上换流站导管架在陆地立式建造合拢过程中，上部片体吊装、主腿打底焊接阶段面临的抗风安全与焊接工艺优化问题，提出了一种基于有限元数值模拟的评估方法。以某70多米高的导管架为例，利用ANSYS建立了精细化模型，通过模拟不同焊接与风载的组合工况，分析了合拢口焊缝的应力分布。结果表明：该导管架焊缝处等效应力随焊接量增加而显著降低。为确保脱钩安全，6级风时焊接厚度需达到壁厚20% (14 mm)以上；12级风时则需达到70% (49 mm)以上，方能使焊缝应力低于材料屈服强。本研究为导管架合拢焊接工艺的制定与脱钩安全决策提供了定量化的理论依据，该方法亦具备向其他大型结构类似工况推广的潜力。

Abstract: A finite element numerical simulation-based assessment method is proposed to address the issues of wind resistance safety and welding process optimization during the onshore vertical assembly of an offshore converter station jacket structure, specifically in the stages of upper module lifting and root welding of the main legs. Taking a jacket structure over 70 meters high as an example, a refined model was established using ANSYS. By simulating combined working conditions involving different welding sequences and wind loads, the stress distribution at the closure weld was analyzed. The results show that the equivalent stress at the weld decreases significantly with increasing weld volume. To ensure hook‑release safety, the weld thickness must exceed 20% of the leg wall thickness (14 mm) under wind force scale 6, and exceed 70% (49 mm) under wind force scale 12, in order to keep the weld stress lower than the material yield strength. This study provides a quantitative theoretical basis for determining the closure welding procedure and making hook‑release decisions for jacket structures. The proposed method also holds potential for extension to other large-scale structures under similar working conditions.