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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Publication

Performance-based probabilistic assessment of liquefaction-induced building settlements

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

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Publication

Seismic Vulnerability of Wine Barrel Stacks

2016 , CANDIA AGUSTI, GABRIEL ALFONSO , Miguel Jaimes , Cesar Arredondo , Juan Carlos de la Llera , Philomène Favier

Recent earthquakes have shown that wine barrel stacks are highly susceptible to collapse, leading to large economic losses, downtime, and longer recovery periods. This study presents a methodology using a probabilistic approach for estimating the fragility functions and economic losses in barrel stacks. The seismic response of these systems was determined from the dynamic equilibrium equations that describe the position and orientation of each element. The analysis considered ground motions scaled at different intensity levels and different barrel stack configurations; the simulations enabled reproducing the most common collapse mechanisms observed in the field and in shaking table experiments. From a statistical analysis of the results, vulnerability functions were evaluated as the probability of being within a specific damage state for a given ground motion intensity. Additional numerical simulations were performed to study the effects of the inherent uncertainty of the interface parameters controlling the dynamic response and collapse sequence of the barrel stacks. Furthermore, this methodology was used to evaluate the impact effect and improvement of a base isolation solution as a damage mitigation measure.

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Publication

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

2022 , CANDIA AGUSTI, GABRIEL ALFONSO , Macedo, Jorge , Liu Chenying , Earthquake Engineering Research Institute

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Publication

New developments for the performance-based assessment of seismically-induced slope displacements

2020 , Jorge Macedo , CANDIA AGUSTI, GABRIEL ALFONSO , Maxime Lacour , Chenying Liu

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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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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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Publication

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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Static and Dynamic Loads on a Shallow Circular Tunnel: Practical Design Considerations

2023 , MEDINA MOLINA, LUIS FELIPE , GUTIÉRREZ VEGA, CARLOS , LYON AUSENSI, BENJAMÍN , CANDIA AGUSTI, GABRIEL ALFONSO

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Publication

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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Publication

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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