Browsing by Author "Cabrera, Tamara"

Now showing 1 - 2 of 2
  • No Thumbnail Available
    Item
    Empirical fragility curves for houses in Chile using damage data from two earthquakes
    (2024) Cabrera, Tamara; Hube, Matias A.; Maria, Hernan Santa; Silva, Vitor; Martins, Luis; Yepes-Estrada, Catalina; Chacon, Matias F.
    Strong seismic events frequently strike Chile. The last three significant events that caused considerable damage and losses are the 2010 (Mw\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${M}_{w}$$\end{document} 8.8, Maule), 2014 (Mw\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${M}_{w}$$\end{document} 8.2, Iquique), and 2015 (Mw\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${M}_{w}$$\end{document} 8.3, Illapel) earthquakes. Therefore, reliable fragility curves are necessary to evaluate the threat of earthquakes to the built environment. This study aims to develop empirical fragility curves of Chilean houses using damage from the 2014 and 2015 earthquakes. The data from 9085 and 7431 damaged houses from the 2014 and 2015 earthquakes, respectively, was obtained by the government. The fragility curves were estimated for reinforced concrete, reinforced masonry, timber, and adobe houses. Additionally, the fragility curves were constructed using three different Peak Ground Acceleration (PGA) maps to quantify the variation of the fragility parameters based on the selected PGA map and to identify which PGA map generates the highest correlation with observed damage. Additionally, fragility curves obtained in this study are compared with curves from other studies. The median theta\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\theta$$\end{document} values of the fragility curves obtained in this study are larger than those from other reported studies.
  • No Thumbnail Available
    Item
    Seismic risk scenarios for the residential buildings in the Sabana Centro province in Colombia
    (2023) Feliciano, Dirsa; Arroyo, Orlando; Cabrera, Tamara; Contreras, Diana; Torres, Jairo Andres Valcarcel; Zapata, Juan Camilo Gomez
    Colombia is in one of the most active seismic zones onEarth, where the Nazca, Caribbean, and South American plates converge.Approximately 83 % of the national population lives in intermediate tohigh seismic hazard zones, and a significant part of the country's buildinginventory dates from before the nation's first seismic design code (1984).At present, seismic risk scenarios are available for the major cities of the country, but there is still a need to undertake such studies in otherregions. This paper presents a seismic risk scenario for the SabanaCentro province, an intermediate hazard zone located close to thecountry's capital. An exposure model was created combining information fromthe Global Earthquake Model (GEM) Foundation, surveys, and the nationalcensus. Fragility and vulnerability curves were assigned to the buildingtypes of the region. A hazard model was developed for the region and18 earthquake scenarios with a return period of 475 years weresimulated using the OpenQuake (OQ) hazard and risk assessment tool toestimate damage and economic losses. In addition, a social vulnerabilityindex (SVI) based on demographic information was used to assess the directeconomic loss in terms of replacement costs. The results show that 10 % of all buildings considered in the region would experience collapse, and 7 % would suffer severe damage. Losses account for 14 % of the total replacement cost of the buildings and represent 21 % of the annual gross domestic product (GDP) of the region.