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Boroschek R.,University of Chile | Bonelli P.,Federico Santa María Technical University | Restrepo J.I.,University of California at San Diego | Retamales R.,Ruben Boroschek and Associates | Contreras V.,Ruben Boroschek and Associates
Geotechnical, Geological and Earthquake Engineering | Year: 2014

The February 27, 2010 Mw 8.8 Maule earthquake in Chile generated MM VII intensity or higher, and PGA = 0.3 g or higher on a 100 km wide by 600 km long corridor, as well as a tsunami Tsunami Tsunami Tsunami Tsunami. Notwithstanding the large area affected by strong shaking, where about eight million people live, there were only 521 casualties Casualties Casualties Casualties Casualties. Approximately a third of the casualties Casualties Casualties Casualties Casualties were due to the tsunami Tsunami Tsunami Tsunami Tsunami alone. Nearly the rest were due to the collapse of non-engineered low-rise dwellings. Eight people only died in modern buildings. The number of severely damaged tall buildings Tall buildings Tall buildings Tall buildings Tall buildings, most likely requiring demolition or heavy structural intervention, has been estimated at around 50 out of 2,000 buildings. A large proportion of the structural damage in tall buildings Tall buildings Tall buildings Tall buildings Tall buildings concentrated in buildings 10 or less years old supported on intermediate or soft soils. Taking into account the total building stock exposure and its damage, and the total population exposure and its losses, this earthquake showed that the local engineering practices are effective at preventing loss of life. However, the disproportionate concentration of structural damage in newly built buildings, the collapse of three buildings, and widespread damage to nonstructural components and systems prompted the government to revise current design practice, in part because current societal expectations are different from expected performance tacitly or explicitly stated in the local design codes. © Springer Science+Business Media Dordrecht 2014.

Miranda E.,Stanford University | Mosqueda G.,State University of New York at Buffalo | Retamales R.,Ruben Boroschek and Associates | Pekcan G.,University of Nevada, Reno
Earthquake Spectra | Year: 2012

The 27 February 2010 Chile earthquake caused widespread nonstructural damage in practically all types of buildings. While few commercial, residential, office, and industrial buildings suffered structural damage, the functionality of many more facilities was disrupted, and significant economic losses were reported due mainly to nonstructural damage. Design requirements for nonstructural components in Chilean design codes are rarely enforced, unless explicitly requested by owners. In addition, construction predating modern codes has not been upgraded to current standards, even for such critical facilities as hospitals. This earthquake highlights that more attention should be devoted to enforcing regulations and improving the seismic performance of nonstructural components whose failure can lead to injuries, substantial economic losses, and partial or total loss of functionality. This is especially important for facilities critical to the response and recovery, such as hospitals and airports that should remain operational even after strong earthquakes. © 2012, Earthquake Engineering Research Institute.

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