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Steel and Composite Structures Volume 49, Number 2, October 25 2023 , pages 181-196 DOI: https://doi.org/10.12989/scs.2023.49.2.181 |
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Research on stress distributions around welds of three-planar tubular Y-joints under out-of-plane bending moment |
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Shiliu Bao, Wenhua Wang, Jikai Zhou and Xin Li
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| Abstract | ||
| Marine structures including offshore wind turbines (OWTs) always work under cyclic loads, which arouses much attention on the fatigue design. The tripod substructure is one of the typical foundation forms for fixed OWTs. The three-planar tubular Y-joint (3Y joint) is one of the important components in fatigue design as it is most likely to have cracks. With the existence of the multiplanar interaction effect, calculating the hot spot stress (HSS) of 3Y joints is complicated. To assist with fatigue design, the distributions of stress concentration factor (SCF) and multiplanar interaction factor (MIF) along weld toe curves induced by the out-of-plane bending moment are explored in this study. An FE analysis method was first developed and verified against experimental results. This method was applied to build a numerical database including 1920 FE models covering common ranges of geometric parameters. A parametric study has been carried out to reveal the distribution patterns of SCF and MIF. After multidimensional nonlinear fittings, SCF and MIF distribution formulas have been proposed. Accuracy and reliability checking prove that the proposed formulas are suitable for calculating the HSS of 3Y joints. | ||
| Key Words | ||
| distribution formula; fatigue design; hot spot stress; offshore wind turbine; out-of-plane bending moment | ||
| Address | ||
| Shiliu Bao and Jikai Zhou:College of Civil and Transportation Engineering, Hohai University, No.1 Xikang Road, Nanjing, China Wenhua Wang and Xin Li:Faculty of Infrastructure Engineering, Dalian University of Technology, No.2 Linggong Road, Dalian, China | ||