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SCFs in tubular X-joints retrofitted with FRP under out-of-plane bending moment

机译：管状X关节中的SCFS在平面外弯矩下用FRP改装

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摘要

This paper presents a parametric study on the stress concentration factors (SCFs) on the chord member in tubular X-connections reinforced with fiber reinforced polymer (FRP) under out-of -plane bending moment. For this aim, a FE model was generated and validated using several available experimental tests. After that, a set of 276 FE models was created to evaluate the effect of the FRP (layer number, orientation, and material) and joint geometry (gamma, tau, and beta) on the SCFs. In these FE models, the contact between the FRP sheets and the steel members (chord, weld, and braces) was modeled. Results indicated that the rise of the FRP laminate number causes a notable drop of the SCFs, especially in the connections with big gamma. Moreover, the increment of the elastic modulus of FRP along the fibers causes a notable decrease of the SCF. Results showed that, for certain geometrical parameters set, the SCF in an X-connection retrofitted with carbon fiber reinforced polymer (CFRP) can be down to 23% of the SCF in the associated un-retrofitted connection. Despite the notable efficacy of the FRP sheets on the drop of the SCFs in the X-connections, there is not any study or equation on the X-connections with FRP. Therefore, an equation was proposed for quantifying the SCFs in the X-connections with FRP.
机译：本文介绍了用纤维增强聚合物（FRP）在弯曲力矩下加固的管状X连接中的弦X型连接中的应力集中因子（SCFS）的参数研究。为此目的，使用多种可用的实验测试来生成和验证FE模型。之后，创建了一组276个FE模型，以评估FRP（层数，方向和材料）和联合几何形状（Gamma，Tau和Beta）对SCFS的影响。在这些FE模型中，FRP板和钢构件（弦，焊接和胶带）之间的接触被建模。结果表明，FRP层压板数量的升高导致SCF的显着落水，尤其是与大伽玛的连接。此外，沿着纤维的FRP的弹性模量的增量导致SCF的显着降低。结果表明，对于某些几何参数集，具有碳纤维增强聚合物（CFRP）的X型连接中的SCF可下降到相关的未改装连接中的SCF的23％。尽管FRP表格在X连接中的SCFS下降时，尽管FRP表格的显着效果，但没有任何研究或与FRP的X连接的研究。因此，提出了一种方程来定量与FRP的X连接中的SCFS。

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