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Structural behavior and design of high-strength steel welded tubular connections under extreme loading
Marine Structures ( IF 3.9 ) Pub Date : 2020-05-01 , DOI: 10.1016/j.marstruc.2019.102701
George E. Varelis , Theocharis Papatheocharis , Spyros A. Karamanos , Philip C. Perdikaris

Abstract The present work is motivated by the increasing need for cost-efficient solutions in offshore structural systems for wind energy production and for improvement of their structural performance. The structural behavior and design of high-strength steel welded tubular connections (yield strength higher than 700 MPa) subjected to monotonic and strong cyclic loading is investigated. In the first part of the paper, an experimental investigation is presented on high-strength steel tubular X-joints subjected to monotonic and cyclic loading far beyond the elastic limit of the material, leading to weld fracture. Two grades of weld metal material are employed in the welding process of the specimens. The experimental results indicate that the weld material grade has a significant influence on the deformation capacity of the welded connection under monotonic loading conditions, and its low-cycle fatigue life. The experimental procedure is simulated using advanced finite element models, elucidating several features of joint behavior and complementing the experimental results. Overall, a good agreement is found between numerical simulations and experimental results, in terms of both global response and local strains at the vicinity of the welds. Furthermore, the structural performance of the welded tubular joints under consideration is assessed using available design methodologies in terms of both ultimate strength and low-cycle fatigue resistance, in an attempt to validate an efficient design methodology for low-cycle fatigue. The results from this research effort are aimed at developing the necessary background for the possible use of high-strength steel in tubular steel lattice structures, particularly in offshore platforms for renewable energy production. They can also be used as a basis for the possible amendment of relevant design specifications and recommendations for including special provisions for high-strength steel structural systems.

中文翻译:

极端载荷下高强度钢焊接管接头的结构行为与设计

摘要 目前的工作是由于对用于风能生产和改进其结构性能的海上结构系统中具有成本效益的解决方案的日益增长的需求。研究了承受单调强循环载荷的高强度钢焊接管接头(屈服强度高于 700 MPa)的结构行为和设计。在论文的第一部分,对高强度钢管 X 型接头进行了远超出材料弹性极限的单调和循环载荷,导致焊缝断裂的实验研究。试样的焊接过程采用两种等级的焊缝金属材料。试验结果表明,焊接材料牌号对焊接连接在单调加载条件下的变形能力及其低周疲劳寿命有显着影响。实验过程使用先进的有限元模型进行模拟,阐明了关节行为的几个特征并补充了实验结果。总体而言,在焊缝附近的全局响应和局部应变方面,数值模拟和实验结果之间存在良好的一致性。此外,在极限强度和低周疲劳抗力方面,使用可用的设计方法评估所考虑的焊接管接头的结构性能,以尝试验证低周疲劳的有效设计方法。这项研究工作的结果旨在为高强度钢在管状钢格结构中的可能使用开发必要的背景,特别是在可再生能源生产的海上平台中。它们也可用作相关设计规范和建议的可能修订的基础,以包括高强度钢结构系统的特殊规定。
更新日期:2020-05-01
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