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SCFs in tubular X-joints retrofitted with FRP under out-of-plane bending moment
https://orcid.org/0000-0002-8987-4657
Abstract 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 (γ, τ, and β) 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 γ. 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.
Highlights The stress concentration factors (SCFs) in tubular X-connections retrofitted with the FRP under OPB load were evaluated 276 3-D FE models were created and analyzed for the parametric investigation. The efficacy of the FRP (layer number, orientation, and material) and the joint geometry (β, τ, and γ) in X-joints were evaluated. A formula for determining the SCF in the X-connections retrofitted with FRP under OPB moment was proposed.
SCFs in tubular X-joints retrofitted with FRP under out-of-plane bending moment
https://orcid.org/0000-0002-8987-4657
Abstract 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 (γ, τ, and β) 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 γ. 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.
Highlights The stress concentration factors (SCFs) in tubular X-connections retrofitted with the FRP under OPB load were evaluated 276 3-D FE models were created and analyzed for the parametric investigation. The efficacy of the FRP (layer number, orientation, and material) and the joint geometry (β, τ, and γ) in X-joints were evaluated. A formula for determining the SCF in the X-connections retrofitted with FRP under OPB moment was proposed.
SCFs in tubular X-joints retrofitted with FRP under out-of-plane bending moment
https://orcid.org/0000-0002-8987-4657
Abstract 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 (γ, τ, and β) 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 γ. 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.
Highlights The stress concentration factors (SCFs) in tubular X-connections retrofitted with the FRP under OPB load were evaluated 276 3-D FE models were created and analyzed for the parametric investigation. The efficacy of the FRP (layer number, orientation, and material) and the joint geometry (β, τ, and γ) in X-joints were evaluated. A formula for determining the SCF in the X-connections retrofitted with FRP under OPB moment was proposed.
SCFs in tubular X-joints retrofitted with FRP under out-of-plane bending moment
Nassiraei, Hossein (Autor:in) / Rezadoost, Pooya (Autor:in)
Marine Structures ; 79
10.04.2021
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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