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

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

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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Seismic risk of sliding ground-mounted rigid equipment

2020 , Miguel A Jaimes , CANDIA AGUSTI, GABRIEL ALFONSO

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Publication

Horizontal and Vertical Ground-Motion Duration Prediction Models from Interplate and Intermediate-Depth Intraslab Earthquakes in Mexico City

2024 , Miguel A. Jaimes , Adrián D. García-Soto , CANDIA AGUSTI, GABRIEL ALFONSO

In this study, we present predictive models for significant ground-motion duration from interplate and intermediate-depth intraslab earthquakes at Mexico City for the horizontal components, the vertical component, and the vertical-to-horizontal ratio case. The considered sites are located over several zones in Mexico City, from rock to soft-soil sites. For the ground-motion duration models, the significant durations for ranges between 5% and 75%, 5% and 95%, and 2.5% and 97.5% of Arias intensity are considered for the analyses. The equations were developed as functions of magnitude, distance of the earthquake, and site period using 16 and 23 event recordings from interplate and intermediate-depth intraslab earthquakes at the hill, transition, and lakebed zones of the city using mixed-effect regression analyses. For the intraslab events, in particular, the new database includes recordings from two significant normal-faulting events that occurred in 2017. The models lead to differences with respect to the previous models. Therefore, predictive models for both considered focal mechanisms are proposed. The model is valid for interplate events at distances from 280 to 500 km and magnitude Mw from 6 to 8.1, for intraslab events at distances of 100 km up to about 650 km, magnitude Mw from 5 to 8.2, and focal depths from 40 km to over 120 km.

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Intensity measures properties and selection for risk analysis on structures subjected to earthquake induced pounding with a non-smooth contact dynamics method

2021 , Langlade T. , Bertrand D. , Grange S. , CANDIA AGUSTI, GABRIEL , De la Llera J.C.

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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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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

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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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

Static earth pressures on a pile supported excavation in Santiago gravel

2019 , Sebastián López , Carola Sanhueza , CANDIA AGUSTI, GABRIEL ALFONSO

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