Preliminary identification of dynamic characteristics of a unique building in chile following 27 february 2010 (Mw=8.8) earthquake

Abstract

Following the 27 February 2010 (Mw = 8.8) Offshore Maule, Chile earth quake, a temporary, real-time data streaming array comprising 16 channels of accel-erometers was deployed throughout a recently constructed 16 story tall building with three additional basement stories in Vina del Mar, Chile. This building was not damaged during the mainshock; however, it is similar in design to many other buildings with multiple shear walls that were damaged but did not collapse in Vina del Mar and other parts of Chile. The temporary array recorded low-amplitude response of the building from aftershocks. The recordings provided dynamic response characteristics of the cast-in-place reinforced concrete building. Available dynamic characteristics from mathematical modal analyses are compared to the observed responses. Distinct "major-axes" translational and torsional fundamental frequencies as well as frequencies of secondary modes are identified. Response data from each earthquake provide evidence of beating. © RILEM 2013.