Seismic Fragility Analysis of High Earth‐Rockfill Dams considering the Number of Ground Motion Records

Jin, Congcong; Chi, Shichun

doi:10.1155/2019/6958643

Cited by 9 publications

(3 citation statements)

References 28 publications

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“…Presently, the number of seismic analytical fragility functions for earth dams is very limited and always based on input selections performed using uniform hazard spectra (UHS) (e.g. Jin and Chi, 2019; Vecchietti et al, 2019, both for rockfill dams). Table 1 summarizes the main studies on fragility functions on some infrastructure systems, for different DM and IM; the dispersion β is also reported.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the optimal ground motion intensity measure in the prediction of the seismic vulnerability of earth dams

et al. 2023

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The large majority of existing earth dams were designed with old standards, which often accounted for the effects of earthquakes in a simplified manner. As a result, seismic re-evaluation of these structures is now becoming increasingly important for dam owners. The seismic performance of earth dams can be evaluated at different levels of resolution, typically ranging from simple sliding block analysis, to the use of advanced numerical models. Seismic inputs for these models are typically chosen using code-based or site-specific probabilistic seismic hazard analysis (PSHA). In this study, we analyze the seismic vulnerability of two major earth dams located in Southern Italy, a seismically active area. The two dam systems have different geotechnical characteristics: one of them is founded on potentially liquefiable materials, whereas the other one is not susceptible to liquefaction. Our analyses are based on finite difference numerical simulations using both simplified and advanced constitutive models. Seismic vulnerability of both dams is analyzed by means of analytical fragility functions for various damage mechanisms and ground motion intensity measures (IMs). Such fragility functions are based on nonlinear deformation analyses within the multiple stripe analysis framework. We analyze efficiency and predictability of various IMs in predicting different damage levels and mechanisms. We show that the cumulative absolute velocity is overall the optimal IM in predicting vulnerability of both earth dams. We also analyze the relative importance of PSHA inputs (i.e. alternative ground motion and earthquake rupture forecast models; GMMs and ERFMs, respectively) and numerical models (simplified vs advanced) in the seismic analysis of earth dams by means of tornado diagrams. We show that the choice of GMMs and ERFMs is always more important than that of the constitutive model. However, for dams prone to liquefaction, the choice of the constitutive model has a higher importance than for non-liquefiable earth dams.

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Section: Introductionmentioning

confidence: 99%

Evaluation of the optimal ground motion intensity measure in the prediction of the seismic vulnerability of earth dams

et al. 2023

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“…Nowadays, fragility curves have mostly been obtained for concrete and arch dams [1,2,3,4]. A few studies, recently published, refer to large earth dams, mainly concrete-faced rockfill dams (CFRDs) [5,6,7], earth-rockfill dams [8], rockfill dams with concrete core [9,10] and just one study (in the authors' knowledge) concerns tailing dams [11].…”

Section: Introductionmentioning

confidence: 99%

Fragility Curves for a Small Zoned Earth Dam

Tretola,

Sica

2023

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

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The paper presents a suite of fragility curves to evaluate the seismic vulnerability of a small earth dam. The goal is to provide a user-friendly tool to estimate the expected damage of this type of barrages that, since classified as small, are typically subjected to less restricting controls than large dams with the consequent increase of their vulnerability. In this study, the incremental dynamic analysis method (IDA) was applied to a prototype of small zoned earth dam. To perform nonlinear dynamic analyses through the finite element software Plaxis2D, an advanced soil constitutive model combined to a three-phase formulation was adopted. To develop the fragility curves for each damage type relevant for the seismic performance of the dam, ten representative accelerometric signals were selected. Four damage measures (DMs) were considered, namely the settlement ratio at the dam crest, the lateral displacements of the dam crest, the freeboard reduction and the maximum plastic shear strain of the watertightness element. These damage indicators were later related to three intensity measures (IMs), i.e. PGA, PGV and the Arias Intensity. As outcome of the study, the fragility curves for different limit states of the identified DMs were obtained.

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“…Cimellaro et al [40] researched the sensitivity of the number of earthquake records using an MDOF inelastic shear-type building and concluded that using 23 ground motions can obtain the accurate estimation of parameters in fragility functions when PGA is IM. Jin and Chi [41] analyzed the effect of the number of earthquake records on the seismic fragility analysis of high earth-rockfill dams. Mo et al [32] selected 28 near-field and 22 far-field ground motions as a suite.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Number of Ground Motions on Fragility Analysis of 5 MW Wind Turbines Subjected to Aerodynamic and Seismic Loads Interaction

Yuan

Xie

et al. 2022

Energies

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In this paper, the influence of the number of ground motions on fragility analysis of 5 MW wind turbines under the excitation of aerodynamic and seismic loads is investigated to acquire the sufficient number of records for reasonable fragility estimation. Two scenarios, parked and normal operation, were simulated with the number of actual recorded ground motions ranging from 2 to 48. The fragility function parameters are estimated by utilizing the method of multiple stripe analysis (MSA), and the relationship between the number of ground motions and estimated parameters for each scenario is discussed. In addition, the influence of the number of ground motions on the range of estimated parameters with a 95% confidence interval is also discussed. The simulation results show that there are significant differences between the two scenarios in terms of fragility analysis for 5 MW wind turbines with the interaction of wind and seismic loads, and the lesser number of earthquakes is needed for a normal operation scenario compared to the parked scenario when obtaining the same accuracy fragility estimation. Furthermore, the appropriate number of ground motions to accurately estimate the fragility parameters of 5 MW wind turbines for the two scenarios is presented herein, which is almost unaffected by different wind spectra.

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Seismic Fragility Analysis of High Earth‐Rockfill Dams considering the Number of Ground Motion Records

Cited by 9 publications

References 28 publications

Evaluation of the optimal ground motion intensity measure in the prediction of the seismic vulnerability of earth dams

Evaluation of the optimal ground motion intensity measure in the prediction of the seismic vulnerability of earth dams

Fragility Curves for a Small Zoned Earth Dam

Influence of the Number of Ground Motions on Fragility Analysis of 5 MW Wind Turbines Subjected to Aerodynamic and Seismic Loads Interaction

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