Performance of tall buildings in Viña del Mar in the 27 February 2010 offshore Maule, Chile earthquakeReport as inadecuate




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After the devastating offshore Maule, Chile earthquake of moment magnitude 8.8 on 27 February 2010, the LosAngeles Tall Buildings Structural Design Council LATBSDC organized a reconnaissance team to visit theSantiago, Concepción and Viña del Mar areas. This report summarizes the highlights of the damage observed inthe Viña del Mar area on the coast 120 km west-north-west of Santiago and much closer to the subduction rupturezone than Santiago. A signifi cant portion of Viña del Mar is uniquely situated on variable ground conditions,particularly in the area with most of the damaged buildings. The Viña del Mar area also included tall buildingsconstructed before and damaged by the large 3 March 1985 magnitude 7.8 Offshore Valparaiso earthquake, whichwere damaged again in the 2010 earthquake.The predominant observation in these buildings was the lack of confi nement and ductile detailing of shearwalls. The second observation was the high demand in the localized Viña del Mar area.The apparently high demand on buildings clustered in the Viña del Mar area may be an observation based onthe damage since most of the taller structures in the area are somewhat clustered in Viña. But signifi cant damagewas not reported in Valparasio, which is largely, situated on higher ground which steps downward to a narrowfl at area along the ocean. Similarly, signifi cant damage was not reported in new buildings along the coast justNorth of Viña del Mar. The authors’ conclusion based on these observations is that the ground conditions in Viñadel Mar relate to the level of demand and the level of demand is higher.Demand is variable geoseismically but with the local history of many earthquakes from the same source zone, thecharacterization should be regularized. However, structural response is much better defi ned at least for confi nedelements with tested and predictable analytical characterization. Regardless, the detailing of reinforcing in reinforcedconcrete must relate to the expected demand and duration. In addition, the structural system and elementsneed to be designed and detailed to prepare a building to survive a higher unanticipated demand without collapse.However, despite the apparently large demands due to the large magnitude earthquake with strong aftershocksand the long duration of seismic motions, building collapses did not occur even with limited capability due tonon-ductile and non-confi ned detailing.Nota general

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Author: Carpenter, Lauren D.; - Naeim, Farzad; - Rojas Barrales, Fabián; - Lew, Marshall; - Youssef, Nabih F.; - Saragoni Huerta, Rodolf

Source: http://repositorio.uchile.cl/



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