Probabilistic analysis of the SCFs in tubular T/Y-joints reinforced with FRP under axial, in-plane bending, and out-of-plane bending loads

Nassiraei, Hossein; Rezadoost, Pooya

doi:10.1016/j.istruc.2021.06.029

Cited by 26 publications

(10 citation statements)

References 19 publications

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“…In this study, the point used as a reference to perform linear extrapolation is located at a location where the maximum equivalent stress occurred. Then the hotspot stress (𝜎 ┴𝑊 ) can be calculated using the following Equation 4 [11].…”

Section: Hotspot Stressmentioning

confidence: 99%

“…The stress concentration factor is obtained by dividing the hotspot stress against the nominal stress as in Equation 5 [11]. Hotspot stress is obtained by previous outlined linear extrapolation, and nominal stress is obtained from the braces at locations where relatively uniform stresses occurred.…”

Section: Stress Concentration Factormentioning

confidence: 99%

“…The reference used to make linear extrapolation points is IIW-XV-E using the equation formulated by Nassiraei and Rezadoost [11]. The equation is available in Equation 4.…”

Section: Hotspot Stressmentioning

confidence: 99%

See 2 more Smart Citations

Stress Concentration Factor Estimation of a Multi-planar DKT Tubular Joint through Finite Element and Machine Learning Approaches

Prastianto¹,

Admiral²,

Hadiwidodo³

et al. 2023

Proceedings of the 1st International Conference on Sustainable Engineering Development and Technological Innovation, ICSEDTI 20

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The Double KT (DKT) multi-planar tubular joint is frequently found in the jacket offshore structures. An important aspect in designing the multi-planar tubular joint is accuracy in predicting the Stress Concentration Factor (SCF). Despite its practicability with considerable accuracy on stress analysis and estimating the SCF, the Finite Element (FE) method needs high computational time and effort. Therefore, this study will develop alternative SCF equations for DKT tubular joint with regression analysis as one of the machine learning techniques to increase equation's accuracy while reducing computational time. The variation of the DKT tubular joint was determined based on the validity range of the geometric parameters of the tubular joint (β, τ , and γ) and the combination of axial, in-plane bending (IPB), and outplane bending (OPB) moment loadings. Stress distribution and concentration factor of the DKT joints were analyzed based on FE model of the joint. Then, the SCF results from the FE analysis were used in the regression analysis to obtain new equations. Six SCF equations including for both brace-side and chord-side have been obtained while the reliability of the equation has been checked using Acceptance Criteria based on UK Department of Energy and showed good results.

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Section: Hotspot Stressmentioning

confidence: 99%

Section: Stress Concentration Factormentioning

confidence: 99%

See 1 more Smart Citation

Stress Concentration Factor Estimation of a Multi-planar DKT Tubular Joint through Finite Element and Machine Learning Approaches

Prastianto¹,

Admiral²,

Hadiwidodo³

et al. 2023

Proceedings of the 1st International Conference on Sustainable Engineering Development and Technological Innovation, ICSEDTI 20

View full text Add to dashboard Cite

show abstract

“…The following Eq. 1 is the critical stress equation based on IIW-XV-E which was reformulated by Nassiraei and Rezadoost [10], where 𝜎 ┴𝑊 is hotspot stress along the extrapolation points (ksi), 𝜎 ┴𝐸1 is stress on the first extrapolation point (ksi), and 𝜎 ┴𝐸2 is stress on the second extrapolation point (ksi):…”

Section: Hot Spot Stressmentioning

confidence: 99%

The Effect of geometric parameters on stress concentration factor of a multiplanar DKT tubular joint through finite element model

Prastianto

Admiral

Rosyid

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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It is important to consider geometric parameters on Stress Concentration Factor (SCF) at the tubular joint, especially multi-planar joint, when designing a jacket platform. Thus, a jacket platform capable to withstand the extreme environmental loads. Many researchers use the Finite Element (FE) method to analyze stress at joints and estimate the SCF with the variation of geometric parameters. That studies obtained the result that geometric parameters have significant effect on decreasing or increasing the SCF. Therefore, this study will delve the effect of geometric parameters (β, τ, and γ) on maximum SCF caused by axial loading, in-plane bending moment, and out-of-plane bending moment at DKT tubular joint. The increase of β results in the decrease in maximum SCF at brace-side and chord-side weld toe, respectively. The increase of τ and γ results in the increase in maximum SCF at brace-side and chord-side weld toe, respectively.

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“…In the related research on meshing in finite element, Nassiraei [ 15 , 16 ] a used sub-zone method to meshing different regions of FRP retrofitted X-connection, and meshing encryption for the extrapolation region. The simulation results were compared with the experimental data to verify the accuracy of the finite element model.…”

Section: Introductionmentioning

confidence: 99%

Application of Mean Modulus in Three-Point Bending and Roll Forming

et al. 2023

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Nonlinear unloading plays an important role in predicting springback during plastic forming process. To improve the accuracy of springback prediction which could provide a guide for precision forming, uniaxial tensile tests and uniaxial loading–unloading–loading tensile tests on SUS304 stainless steel were carried out. The flow stress mathematical model and chord modulus mathematical model were calibrated according to the test results. A constant elastic modulus three-point bending finite element model (E0FEMB) and a constant elastic modulus roll forming finite element model (E0FEMR) were established in MSC.MARC. The chord modulus was output by the PLOTV subroutine to determine the mean modulus of different regions, and the mean modulus three-point bending finite element model (E¯cFEMB) and the mean modulus roll forming finite element model (E¯cFEMR) were defined. The constant modulus finite element model (E0FEM) simulation results and the mean modulus finite element model (E¯cFEM) simulation results were compared with the three-point bending tests and roll forming tests test results. The difference between the simulation results and the test results was small, indicating that the mean modulus was feasible to predict the springback, which verified the suitability of the E¯cFEM.

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Probabilistic analysis of the SCFs in tubular T/Y-joints reinforced with FRP under axial, in-plane bending, and out-of-plane bending loads

Cited by 26 publications

References 19 publications

Stress Concentration Factor Estimation of a Multi-planar DKT Tubular Joint through Finite Element and Machine Learning Approaches

Stress Concentration Factor Estimation of a Multi-planar DKT Tubular Joint through Finite Element and Machine Learning Approaches

The Effect of geometric parameters on stress concentration factor of a multiplanar DKT tubular joint through finite element model

Application of Mean Modulus in Three-Point Bending and Roll Forming

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