Dissipations in reinforced concrete components: Static and dynamic experimental identification strategy

Heitz, Thomas; Maoult, Alain Le; Richard, Benjamin; Giry, Cédric

doi:10.1016/j.engstruct.2018.02.065

Cited by 11 publications

(20 citation statements)

References 36 publications

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“…This comes from the reduced number of phenomena retained in the proposed constitutive modeling (essentially diffused damage) and from the regulatory requirement of low values for the RC structural damping even after the nonlinear incursions into damaged states. Indeed, as revealed during these experimental campaigns, it is possible to identify an increasing damping level with the evolving damaged state of the RC sections, see for instance (Heitz et al 2018). Nevertheless, it can be concluded on the relevance of structural nonlinear calculations in order to take profit of energy dissipation and internal forces redistribution, in terms of seismic safety margins best-estimate justification.…”

Section: Enhanced Kinematics Modelsmentioning

confidence: 91%

“…The Ph.D. study of T. Heitz (2017) allowed the performing of a huge experimental seismic campaign, and part of the data were studied and interpreted Dynamic experimental set-up on the Azalée shaking table Vol. 177, (2020) Main Achievements of the Multidisciplinary SINAPS@ Research Project (Heitz et al 2018). Nevertheless, the problematics of the damping in reinforced concrete structures during seismic events represent a vast field of challenges that has still to be tackled.…”

Section: Main Achievementsmentioning

confidence: 99%

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Main Achievements of the Multidisciplinary SINAPS@ Research Project: Towards an Integrated Approach to Perform Seismic Safety Analysis of Nuclear Facilities

Berge‐Thierry¹,

Voldoire²,

López-Caballero³

et al. 2019

Pure Appl. Geophys.

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This contribution provides an overview of the SINAPS@ French research project and its main achievements. SINAPS@ stands for ''Earthquake and Nuclear Facility: Improving and Sustaining Safety'', and it has gathered the broad research community together to propose an innovative seismic safety analysis for nuclear facilities. This five-year project was funded by the French government after the 2011 Japanese Tohoku large earthquake and associated tsunami that caused a major accident at the Fukushima Daïchi nuclear power plant. Soon after this disaster, the international community involved in nuclear safety questioned the current methodologies used to define and to account for seismic loadings for nuclear facilities during the design and periodic assessment review phases. Within this framework, worldwide nuclear authorities asked nuclear licensees to perform 'stress tests' to estimate the capacity of their existing facilities for sustaining extreme seismic motions. As an introduction, the French nuclear regulatory framework is presented here, to emphasize the key issues and the scientific challenges. An analysis of the current French practices and the need to better assess the seismic margin of nuclear facilities contributed to the shaping of the scientific roadmap of SINAPS@. SINAPS@ was aimed at conducting a continuous analysis of completeness and gaps in databases (for all data types, including geology, seismology, site characterization, materials), of reliability or deficiency of models available to describe physical phenomena (i.e., prediction of seismic motion, site effects, soil and structure interactions, linear and nonlinear wave propagation, material constitutive laws in the nonlinear domain for structural analysis), and of the relevance or weakness of methodologies used for seismic safety assessment. This critical analysis that confronts the methods (either deterministic or probabilistic) and the available data in terms of the international state of the art systematically addresses the uncertainty issues. We present the key results achieved in SINAPS@ at each step of the full seismic analysis, with a focus on uncertainty identification, quantification, and propagation. The main lessons learned from SINAPS@ are highlighted. SINAPS@ promotes an innovative integrated approach that is consistent with Guidelines #22, as recently published by the French Nuclear Safety Authority (Guidelines ASN #22 2017), and opens the perspectives to improve current French practice.

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Section: Enhanced Kinematics Modelsmentioning

confidence: 91%

Section: Main Achievementsmentioning

confidence: 99%

Main Achievements of the Multidisciplinary SINAPS@ Research Project: Towards an Integrated Approach to Perform Seismic Safety Analysis of Nuclear Facilities

Berge‐Thierry¹,

Voldoire²,

López-Caballero³

et al. 2019

Pure Appl. Geophys.

Self Cite

View full text Add to dashboard Cite

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“…The experimental campaign performed by [2] at the French Alternative Energies and Atomic Energy Commission (CEA) Saclay represents a huge amount of data that can be used as a reference to validate numerical analyses. Experiments were performed with different material properties, structural configurations and excitation characteristics on reinforced concrete beam.…”

Section: Reinforced Concrete Beam Under Earthquake Excitationmentioning

confidence: 99%

“…Based on a shake table experimental campaign performed by Heitz [2] to characterize seismic energy dissipation in reinforced concrete beams, a numerical study is presented herein. It aims at evaluating the performances of existing local as well as global (Rayleigh) damping formulations in representing the experimental data.…”

Section: Introductionmentioning

confidence: 99%

Local Scale Damping Model for Reinforced Concrete Elements

Chambreuil¹,

Giry²,

Léger³

2021

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Reinforced concrete (RC) structures dissipate energy when subjected to seismic excitations. Modeling seismic energy dissipations on a rational basis still represents challenging issues. At local scale, dissipative constitutive RC models are developed to take into consideration different phenomena, such as cracks opening, friction, plasticity, and their couplings or rebar bond slip. Practically some of those dissipative mechanisms are modeled by equivalent Rayleigh viscous damping at the global structural level. However, Rayleigh damping lacks a physical basis leading sometimes to an uncontrolled evolution of energy dissipation when non linearities occur [1]. This paper provides the basis of an updated local damping model based on parameters modeling concrete dissipative phenomenon, to reduce the need for arbitrary equivalent viscous damping as much as possible and thus better model energy dissipations on a rational physical basis. Using shake table experimental results on prismatic RC beams [2], a numerical study is presented to assess the performance of sixteen different global damping formulations to represent physical energy dissipation mechanisms. Energy balance analyses are used to evaluate dissipative phenomena at the local concrete level and to demonstrate that friction is the most significant local dissipative phenomenon. In addition, an equivalent viscous damping identification method is developed to determine transient damping ratio evolution during dynamic computations as a function of damage parameters, like stiffness degradation. An exponential function is found suitable to take into consideration global viscous damping adjustment as a function of local damage occurring during dynamic nonlinear analyses. COMPDYN 2021 8 th ECCOMAS Thematic Conference on Computational Methods in Structural Dynamics and Earthquake Engineering M. Papadrakakis, M. Fragiadakis (eds.

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“…However, the nonlinear time‐history analysis, which is based on the nonlinear constitutive model, is the most appropriate way to account for the hysteretic behaviors of structures 14 . Under this condition, the damping should account for the remaining energy dissipation which is not explicitly modeled, including the energy dissipated through cracking or internal friction between the constitutive material 15 . Considering the fact that the viscous damping mechanism is not derived from sound physical principles, the choice of the viscous damping model to cover this part of energy dissipation is quite questionable.…”

Section: Introductionmentioning

confidence: 99%

Study on nonlinear damping behavior of damaged recycled aggregate concrete beams

Wang

Liang

2021

Structural Concrete

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An experimental study on the nonlinear damping behavior of recycled aggregate concrete (RAC) beams is conducted through subjecting dynamic loadings at the different damage stages. The effects of the loading frequency, loading amplitude, damage, recycled aggregate, and replacement percentage on the energy dissipation by damping and the equivalent viscous damping ratio (EVDR) of the RAC beams are analyzed. The experimental results show that the energy dissipation and the EVDR are not directly influenced by the loading frequency, and the EVDR rises with the increasing loading amplitude for the damaged beams. The damage stage is of great significance to the damping mechanism. The EVDR is firstly increased, peaks at the yielding stage, and finally declines with the damage accumulation, and the EVDR at the yielding stage can be increased to 2.6–3.1 times compared to the undamaged RAC beams. The EVDRs are higher for the beams with the incorporation of the recycled aggregates, because of their lower stiffness and higher energy dissipation. The experimental results demonstrate that the commonly applied viscous damping model is not capable of correctly describing the damping behavior of RAC beams, whereas the modified Coulomb damping model performs much better. A shift in the damping mechanism is observed with the damage evolution, and the relationships between the damage indices and the damping parameters are established.

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Dissipations in reinforced concrete components: Static and dynamic experimental identification strategy

Cited by 11 publications

References 36 publications

Main Achievements of the Multidisciplinary SINAPS@ Research Project: Towards an Integrated Approach to Perform Seismic Safety Analysis of Nuclear Facilities

Main Achievements of the Multidisciplinary SINAPS@ Research Project: Towards an Integrated Approach to Perform Seismic Safety Analysis of Nuclear Facilities

Local Scale Damping Model for Reinforced Concrete Elements

Study on nonlinear damping behavior of damaged recycled aggregate concrete beams

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