Detailed Nonlinear Fe Pushover Analysis of Alto Rio Building

Abstract eng:
The fifteen story Alto Rio building built between 2007 and 2009 in the city of Concepción, Chile, was the only modern building to experience catastrophic collapse during the 27 February 2010, Mw 8.8 Maule earthquake. This building was representative of those medium-rise buildings designed and built in Chile during the period 1996-2009 in which seismic resistance is provided by a dense array of thin wall bearing walls oriented in two orthogonal directions. A detailed nonlinear model of this building was developed in the computer program ABAQUS/Standard FE. This program was used in conjunction with the ANACAP-U concrete and reinforcing bar constitutive models developed by ANATECH Corporation. A parametric pushover analysis of the building was conducted considering several possible scenarios: with and without lap splice failure, and with and without the removal of some small gravity columns. This paper describes the development of the finite element model and discusses the results obtained from a parametric nonlinear static pushover analysis of the Alto Rio Building.

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