CANDIA AGUSTI, GABRIEL ALFONSO
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CANDIA AGUSTI, GABRIEL ALFONSO
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gcandia@udd.cl
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36503632200

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Holistic rockfall risk assessment in high mountain areas affected by seismic activity: Application to the Uspallata valley, Central Andes, Chile

2023 , Manon Farvacque , Nicolas Eckert , CANDIA AGUSTI, GABRIEL ALFONSO , Franck Bourrier , Christophe Corona , David Toe

AbstractOver large regions exposed to natural disasters, cascading effects resulting from complex or concatenated natural processes may represent a large portion of total risk. Populated high‐mountain environments are a major concern, and methods for large‐scale quantitative risk analyses are urgently required to improve risk mitigation. This article presents a comprehensive quantitative rockfall risk assessment over a large archetypal valley of the Andean mountains, in Central Chile, which integrates a wide spectrum of elements at risk. Risk is expressed as an expected damage both in monetary terms and casualties, at different scales relevant for decision making. Notably, total rockfall risk is divided into its main drivers, which allows quantifying seismically induced rockfall risk. For this purpose, the local seismic hazard is quantified and the yield acceleration, that is, acceleration required to initiate rockfall, is determined at the regional scale. The probability of failure is thereafter derived in terms of annual frequency of rockfall initiation and integrated in the quantitative risk assessment (QRA) process. Our results show the significant role of seismic activity as the triggering mechanism of rockfalls, and highlight elements at risk that have a major contribution to the total risk. Eventually a sensitivity analysis is conducted to (i) assess the robustness of obtained risk estimates to the data and modeling choices and (ii) identify the most influential assumptions. Our approach evidences the feasibility of large‐scale QRAs in sensitive environments and opens perspectives for refining QRAs in similar territories significantly affected by cascading effects and multihazards.

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Cost-Benefit Analysis of Seismic Mitigation Measures for Wine Barrel Stacks

2018 , Miguel A. Jaimes , CANDIA AGUSTI, GABRIEL ALFONSO , Philomène Favier

This study conducts a cost-benefit analysis of alternative seismic risk mitigation methods for wine barrel stacks. The Chilean wine industry is presented as an illustrative case study in which performance metrics, such as the expected annual loss (EAL) and benefit-cost ratios, are computed for wineries at different locations. By computing seismic risk within a consistent framework, this study shows the value of cost-benefit simulations for defining the best mitigation strategies and allocating economic resources. Likewise, this approach helps communicate information to decision makers because it is presented in a simple and transparent way, even if they are not familiar with formal risk studies. For three-level wine barrel stacks, it was observed that the Cradle Extender®(MS1) prevents a large number of barrel collapses and provides the highest benefit-cost ratio. On the other hand, for six-level wine barrel stacks, the prestressed cable (MS2) is more effective than MS1 as it prevents the barrel stack from overturning. No significant loss reduction is apparent in four- and five-level wine barrel stacks with the use of mitigation strategies; indeed, the mitigation strategies could generate greater losses and, therefore, other alternatives must be proposed.

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Performance-Based Probabilistic Assessment of Liquefaction Induced Building Settlement in Earthquake Engineering

2022 , Chenying Liu , Jorge Macedo , CANDIA AGUSTI, GABRIEL ALFONSO

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Machine learning techniques for estimating seismic site amplification in the Santiago basin, Chile

2022 , J.P. Díaz , E. Sáez , M. Monsalve , CANDIA AGUSTI, GABRIEL ALFONSO , F. Aron , G. González

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Seismic response of retaining walls with cohesive backfill: Centrifuge model studies

2016 , CANDIA AGUSTI, GABRIEL ALFONSO , Roozbeh Geraili Mikola , Nicholas Sitar

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Overturning risk of rigid electric equipment during mexican earthquakes

2018 , Jaimes M.A. , CANDIA AGUSTI, GABRIEL ALFONSO

This study presents a seismic risk assessment of toppling in electrical equipment supported at its foundation caused by near-fault and far-field ground motions Mexico, for sites located on firm soil. A set of nine electrical equipment ranging in height from 3.0 to 5.08 m, block angle from 18.7 to 34.6 degrees, rigid block frequency parameters from 1.54 to 2.16 rad/s, and sizes from 1.58 to 2.49 m are used. Three conditions are analyzed 1) equipment simply supported on the foundation; 2) equipment anchored to the foundation; and 3) equipment supported on a seismic base isolator. The levels to achieve the failure and reliability of the toppling risk of each of the three conditions studies are computed. The study demonstrates that the mean annual rates of failure decrease monotonically with increasing block angle for both sites and the three conditions studied. This investigation concludes that the reliability for free-standing equipment due to nearfault ground motions is slightly higher than for equipment anchored to the foundation or equipment supported on a seismic base isolator. However, for equipment under the ground motions originated in a far-field source, the reliability for anchored equipment is slightly higher than for free-standing equipment or equipment supported on a seismic base isolator.

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Performance-based probabilistic assessment of liquefaction-induced building settlements

2021 , Chenying Liu , Jorge Macedo , CANDIA AGUSTI, GABRIEL ALFONSO

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Product

Dataset - Scaling behavior of public procurement activity

2020 , CANDIA AGUSTI, GABRIEL ALFONSO

This dataset contains all the necessary data to replicate our study, which is currently under review. The dataset contains information on Public Procurement Activity of Portuguese municipalities between 2011 and 2018. File SAI.csv contains information on the total value executed per municipality on different types of procurement contracts, per year. Additionally it contains information on the prediction and residuals from the best fitting scaling law, and population size.File socio-economic.csv contains a set of indicators extracted from porData and compiled by us.Procurement_data.csv contains additional information on procurement activity per municipality, for instance the number of contracts issued per municipality on each year per type of contract.

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The September 19, 2017 Mw 7.1 Puebla-Mexico City earthquake: Observed rockfall and landslide activity

2020 , Jack Montgomery , CANDIA AGUSTI, GABRIEL ALFONSO , Anne Lemnitzer , Alejandro Martinez

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Performance-based assessment of the seismic pseudo-static coefficient used in slope stability analysis

2020 , Jorge Macedo , CANDIA AGUSTI, GABRIEL ALFONSO

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