Fragility curves for hardfill dams under seismic loading

Hurtado-López, Grissel; Mayoral-Villa, Juan Manuel

doi:10.24850/j-tyca-2020-01-04

Cited by 2 publications

(1 citation statement)

References 5 publications

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“…For each T R , 7 to 10 inputs were selected to capture the uncertainties related to ground motion variability. This relatively high number of ground motions per IM level ensures that the ground motion uncertainties are captured (Figura, 2020; Hurtado-López and Mayoral-Villa, 2020). More details about the ground motion selection, scaling process, and estimation of the fundamental period of the dam are provided by Regina (2021).…”

Section: Msa-based Fragility Functions For Different Imsmentioning

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: Msa-based Fragility Functions For Different Imsmentioning

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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Seismic Fragility of a Multi-Frame Box-Girder Bridge Influenced by Seismic Excitation Angles and Column Height Layouts

Wang

Zhao

et al. 2022

Buildings

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Curved multi-frame box-girder bridges with hinges are widely used in the United States due to the large spanning capacity, construction simplification and construction cost economy. This type of bridge frequently has the characteristics of column height asymmetry, adjacent bridge frames vibrating discrepancy. The combination of curved shape and random seismic excitation angles could aggravate the irregularity of the structural seismic response. In this study, an OpenSees model is established for an example bridge, and the hinge is taken as a key component to observe. The impacts of seismic excitation angles and column height layouts on fragility are investigated through the comparison of the fragility curves. The conclusions list the most unfavorable seismic excitation angles corresponding to the fragilities of bridge system, plug-type concrete elements in hinges, hinge restrainers, columns, abutment bearings as well as the secondary components, respectively. The symmetrical column height layout is proved to be beneficial to mitigate the damage risks of restrainers in intermediate hinges and reduce the fragility of the bridge system. This study can provide a reference for the rapid assessment of the fragile position and damage degree of bridges through structural configuration and shape, as well as the seismic excitation angle.

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Fragility curves for hardfill dams under seismic loading

Cited by 2 publications

References 5 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

Seismic Fragility of a Multi-Frame Box-Girder Bridge Influenced by Seismic Excitation Angles and Column Height Layouts

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