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Fatigue assessment of CFST joints using the effective notch stress approach
Abstract Compared to tubular joints formed by hollow steel sections, concrete-filled steel tubular (CFST) joints exhibit more complicated failure modes and mechanism under fatigue load due to the nonlinear material confinement and the associated stress redistribution. For a reliable fatigue design of such composite tubular joints, these complexities need to be fully addressed and reasonably quantified, which necessitates an accurate approach for assessing their fatigue performance. The effective notch stress approach is widely recognized in fatigue design for its applicability and efficiency in evaluating the fatigue strength since it can rationally account for the effects of geometric configurations and welding defects on the fatigue performance. However, it has not been widely adopted in the assessment of CFST joints due to the high costs involved in modelling and computing. In this paper, a refined nonlinear finite element model is established, which facilitates the acquisition of reliable notch stress values. Subsequently, a statistical analysis is conducted on the available fatigue data of CFST joints, employing the computed notch stress to yield an S–N curve. A comparative evaluation on the results obtained from the nominal stress approach, the hot-spot stress approach and the effective notch stress approach testifies the superior accuracy of the last in assessing the fatigue strength of CFST joints.
Highlights The effective notch stress approach is employed to evaluate the fatigue performance of CFST tubular joints. Refined FE models are established considering nonlinear material confinement and welding geometry discontinuity. A fatigue test database is established for CFST joints to enable statistical analysis of S–N curves and scatter indices. Effective notch stress outperforms the nominal stress and hot-spot stress approaches in prediction accuracy.
Fatigue assessment of CFST joints using the effective notch stress approach
Abstract Compared to tubular joints formed by hollow steel sections, concrete-filled steel tubular (CFST) joints exhibit more complicated failure modes and mechanism under fatigue load due to the nonlinear material confinement and the associated stress redistribution. For a reliable fatigue design of such composite tubular joints, these complexities need to be fully addressed and reasonably quantified, which necessitates an accurate approach for assessing their fatigue performance. The effective notch stress approach is widely recognized in fatigue design for its applicability and efficiency in evaluating the fatigue strength since it can rationally account for the effects of geometric configurations and welding defects on the fatigue performance. However, it has not been widely adopted in the assessment of CFST joints due to the high costs involved in modelling and computing. In this paper, a refined nonlinear finite element model is established, which facilitates the acquisition of reliable notch stress values. Subsequently, a statistical analysis is conducted on the available fatigue data of CFST joints, employing the computed notch stress to yield an S–N curve. A comparative evaluation on the results obtained from the nominal stress approach, the hot-spot stress approach and the effective notch stress approach testifies the superior accuracy of the last in assessing the fatigue strength of CFST joints.
Highlights The effective notch stress approach is employed to evaluate the fatigue performance of CFST tubular joints. Refined FE models are established considering nonlinear material confinement and welding geometry discontinuity. A fatigue test database is established for CFST joints to enable statistical analysis of S–N curves and scatter indices. Effective notch stress outperforms the nominal stress and hot-spot stress approaches in prediction accuracy.
Fatigue assessment of CFST joints using the effective notch stress approach
Liang, Guiming (author) / Hou, Chao (author) / Tan, Qinghua (author)
2023-12-27
Article (Journal)
Electronic Resource
English
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