Quantification of model uncertainties of the energy-based method for dynamic column removal scenarios

Ding, Luchuan; Coile, Ruben Van; Botte, Wouter; Caspeele, Robby

doi:10.1016/j.engstruct.2021.112057

Cited by 17 publications

(19 citation statements)

References 44 publications

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“…At the same time, when assessing the ultimate dynamic resistance of the system, the solutions are more conservative in comparison with the experimental results. The problem concerning the quantitative assessment of the uncertainties of the proposed energy balance method in comparison with nonlinear dynamic analysis (NLD) considers in works [7,17,24,25,27]. It was noted in [7] that "to avoid cumbersome nonlinear dynamic analyses, the energy-based method (EBM) is promising technique to predict the maximum dynamic responses of structural system".…”

Section: Results Of the Numerical Simulation And Discussionmentioning

confidence: 99%

“…The problem concerning the quantitative assessment of the uncertainties of the proposed energy balance method in comparison with nonlinear dynamic analysis (NLD) considers in works [7,17,24,25,27]. It was noted in [7] that "to avoid cumbersome nonlinear dynamic analyses, the energy-based method (EBM) is promising technique to predict the maximum dynamic responses of structural system". It was found that the uncertainty of modeling the energy-based method in comparison with nonlinear dynamic analysis (NLD) is well described by a lognormal distribution with the following statistical parameters LN (0.95; 0.20).…”

Section: Results Of the Numerical Simulation And Discussionmentioning

confidence: 99%

“…It was found that the uncertainty of modeling the energy-based method in comparison with nonlinear dynamic analysis (NLD) is well described by a lognormal distribution with the following statistical parameters LN (0.95; 0.20). It should be noted that the presented results of the estimation of the modeling uncertainty can be attributed only to the results of modeling the experimental structure [7]. A more accurate estimate of the modeling uncertainty is needed using a set of different design solutions.…”

Section: Results Of the Numerical Simulation And Discussionmentioning

confidence: 99%

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Modeling damaged precast structural system when its robustness check

Tur

Lizahub

2021

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Within the framework of traditional approaches to checking for resistance of reinforced concrete buildings and structures to the progressive collapse development, membrane (chain) forces in a damaged structural system are calculated separately, without considering its non-linear bending behavior during the formation of the plastic hinges and without checking the possibility of achieving large deflections.The authors propose an approach to modelling a nonlinear quasi-static reaction of a damaged structural system in an accidental design situation. This approach considers non-linear bending and the resistance of reserved horizontal ties, considering their ultimate ductility. The authors verified the proposed approach based on the results of experimental studies by others researchers.An example of the application of the proposed approach in assessing the robustness of a structural system made of precast concrete with a sudden removal of the central column is considered. In accordance with the provisions of the energy approach, an analysis is made of the contribution of individual resistance mechanisms to the total quasi-static and dynamic resistance of the damaged structural system.We show that the proposed calculation model adequately describes the behavior of a damaged structural system in an accidental design situation, and therefore to carry out parametric studies and check the robustness of building structures.

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Section: Results Of the Numerical Simulation And Discussionmentioning

confidence: 99%

Section: Results Of the Numerical Simulation And Discussionmentioning

confidence: 99%

Section: Results Of the Numerical Simulation And Discussionmentioning

confidence: 99%

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Modeling damaged precast structural system when its robustness check

Tur

Lizahub

2021

iboa

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“…Alternatively, the energy-based method (EBM) has been developed as an approximate approach to predict the dynamic load-bearing capacity without the need to perform a direct dynamic analysis [17]. The EBM is based on the principle of energy conservation, in which the resistance against progressive collapse is assessed based on the capability of absorbing and dissipating the energy introduced by the unbalanced loads [18,19]. This approach has proven to be efficient for the analyses following sudden column removal scenarios [20][21][22][23][24][25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, considering that the EBM is an approximate approach, the quantitative assessment of the model uncertainty associated to the EBM becomes important when the EBM is applied to quantify the reliability or robustness of a RC building structure following a sudden column removal scenario. Such information regarding RC frames is currently lacking in the literature [19]. The model uncertainty information of the EBM is crucial to adequately quantify the failure probability of a system when the EBM is adopted.…”

Section: Introductionmentioning

confidence: 99%

Performance Assessment of an Energy–Based Approximation Method for the Dynamic Capacity of RC Frames Subjected to Sudden Column Removal Scenarios

et al. 2021

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The alternative load path method is widely used to assess the progressive collapse performance of reinforced concrete structures. As an alternative to an accurate non–linear dynamic analysis, an energy–based method (EBM) can also be adopted to approximately calculate the dynamic load–bearing capacity curve or the dynamic resistance based on a static capacity curve. However, dynamic effects cannot be explicitly taken into account in the EBM. The model uncertainty associated with the use of the EBM for evaluating the dynamic ultimate capacity of structural frames has not yet been quantified. Knowledge of this model uncertainty is however necessary when applying EBM as part of reliability calculations, for example, in relation to structural robustness quantification. Hence, this article focuses on the evaluation of the performance of the EBM and the quantification of its model uncertainty in the context of reliability–based assessments of progressive or disproportionate collapse. The influences of damping effects and different column removal scenarios are investigated. As a result, it is found that damping effects have a limited influence on the performance of the EBM. In the case of an external column removal scenario, the performance of the EBM is lower as the response is not a single deformation mode according to the results in the frequency domain. However, a good performance is found in the case of an internal column removal scenario in which the assumption of a single deformation mode is found to be sufficiently adequate. Probabilistic models for the model uncertainties related to the use of the EBM compared to direct dynamic analyses are proposed in relation to both the resistances and the associated displacements. Overall, the EBM shows to be an adequate approximation, resulting in a small bias and small standard deviation for its associated model uncertainty.

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