Nonlinear Elasticity Observed in Buildings during a Long Sequence of Earthquakes

Astorga, Ariana; Guéguen, Philippe; Kashima, Toshihide

doi:10.1785/0120170289

Cited by 61 publications

(72 citation statements)

References 40 publications

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“…Note that the long‐time logarithmic recovery processes were also observed from building vibrations induced by earthquakes (see Astorga et al, , and references therein).…”

Section: Experimental Datamentioning

confidence: 83%

Long‐Time Relaxation Induced by Dynamic Forcing in Geomaterials

et al. 2019

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We present a theoretical model and experimental evidence of the long-time relaxation process (slow dynamics) in rocks and other geomaterials following a dynamic wave excitation, at scales ranging from the laboratory to the Earth. The model is based on the slow recovery of an ensemble of grain contacts and asperities broken by a mechanical impact. It includes an Arrhenius-type equation for recovery of the metastable, broken contacts. The model provides a characteristic size of the broken contacts (order 10 −9 m) and predicts that their number increases with impact amplitude. Theoretical results are in good agreement with the laboratory and field data in that they predict both the logarithmic law of recovery rate and deviations from this law.

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“…Note that the long‐time logarithmic recovery processes were also observed from building vibrations induced by earthquakes (see Astorga et al, , and references therein).…”

Section: Experimental Datamentioning

confidence: 83%

Long‐Time Relaxation Induced by Dynamic Forcing in Geomaterials

et al. 2019

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“…For example, a real-time online algorithm could be developed using a solution like that proposed by Guéguen and Tiganescu [54], based on the traffic light concept. Additionally, false alarms would have to be taken into account by integrating natural frequency variations and the slow recovery of the elastic properties after a seismic event, as reported by Guéguen et al [56] and Astorga et al [17].…”

Section: Resultsmentioning

confidence: 99%

“…Clinton et al [16] and Astorga et al [17] showed the accumulated effect of successive earthquakes on frequency drop, in relation to the amplitude of seismic loading, for long-term structural monitoring. Furthermore, Gallipoli et al [18] reported the co-seismic frequency drop of permanent monitored buildings during main and aftershocks.…”

Section: Introductionmentioning

confidence: 99%

Forecasting Time-Variable Earthquake Risk for Reinforced Concrete Buildings During Aftershock Sequences Based on Operational Earthquake Forecasting and Resonance Period Elongation

Trevlopoulos¹,

Guéguen²,

Helmstetter³

et al. 2019

Proceedings of the 7th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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The probability of a reinforced concrete building to sustain cumulative damage during afterschock sequences is a key issue for crisis management. Assessments of time-variant probabilities of damage states are made herein for reinforced concrete building models the city of Thessaloniki, Greece, in the case of a mainshock scenario. The elongation of the first eigenperiod of the building is used as the engineering demand parameter in the computation of the fragility curves for the building models. Period elongation is selected, as it is readily available in the case of buildings with permanent monitoring systems, which are part of a critical infrastructure, and it may be used complementary to post-earthquake building inspection in order to assess earthquake damage. The increase of the vulnerability of the buildings with time due to potential earthquake damage accumulation is modeled with a probabilistic approach, which is based on the Markov chain. During the aftershock sequences the probability to exceed period elongation thresholds accumulates. Additional risk due to aftershocks as a function of time is estimated and the developed framework is based on the traffic-light concept (red-orange-green) for building-tagging with respect to seismic risk to support earthquake risk management in the course of aftershock sequences.

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“…However, the exact model simulations consider the variability of stiffness parameters using their exact probability distributions. It is worth noting that under large amplitude seismic excitations, buildings experience non-linear hysteretic behavior (Astorga et al, 2018). Therefore, in the case of dealing with large amplitude excitations, a non-linear model of the structural system is recommended to be used.…”

Section: Response Time History Predictionmentioning

confidence: 99%