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Stress concentration factors in tubular T/Y-connections reinforced with FRP under in-plane bending load
Marine Structures ( IF 3.9 ) Pub Date : 2021-03-01 , DOI: 10.1016/j.marstruc.2020.102871
Hossein Nassiraei , Pooya Rezadoost

Abstract Stress concentration factors (SCFs) in steel tubular T/Y-connections strengthened with fiber reinforced polymer (FRP) are investigated. In the first step, a finite element (FE) model was developed and verified using data of several available experimental tests and empirical formulas. After that, 134 FE models of T/Y-joints with and without FRP were created and analyzed under in-plane bending (IPB) load. In the FE models, the contact between the FRP layers and the members (chord, brace, and weld) was defined. Results showed that the increase of the FRP layer number leads to the notable decrease of the SCFs. Also, the SCFs of a T/Y-joint reinforced with FRP can be down to 40% of the SCF of the corresponding unreinforced joint. Finally, FE results were used to propose two parametric formulas for determining the SCFs in the T/Y-joints strengthened with FRP subjected to IPB load. The proposed formulas were checked according to the UK Department of Energy acceptance criteria.

中文翻译:

在平面内弯曲载荷下用 FRP 加固的管状 T/Y 连接中的应力集中系数

摘要 研究了用纤维增强聚合物 (FRP) 加固的钢管 T/Y 连接中的应力集中系数 (SCF)。在第一步中,使用几个可用的实验测试和经验公式的数据开发和验证了一个有限元 (FE) 模型。之后,在面内弯曲 (IPB) 载荷下创建和分析了 134 个带和不带 FRP 的 T/Y 接头有限元模型。在有限元模型中,定义了 FRP 层和构件(弦杆、支撑和焊缝)之间的接触。结果表明,FRP 层数的增加导致 SCF 的显着降低。此外,用 FRP 加固的 T/Y 接头的 SCF 可以下降到相应未加固接头 SCF 的 40%。最后,有限元结果用于提出两个参数公式,用于确定在承受 IPB 载荷的 FRP 加固的 T/Y 接头中的 SCF。根据英国能源部的验收标准检查了提议的公式。
更新日期:2021-03-01
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