ASCE/SEI 31/41 evaluations of buildings damaged in the 2010 Maule, Chile Earthquake
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Many mid- and high-rise structural wall buildings were damaged as a result of the 2010 Maule, Chile earthquake. Damage to these buildings was extensively documented by reconnaissance teams, and in some instances, building plans were obtained to allow detailed evaluations of the structure. As part of a project by the ATC-94 committee, a number of these buildings were evaluated to determine if the observed building deficiencies would be identified by the ASCE/SEI 31/41 evaluation procedures. ASCE/SEI 31/41 evaluations were conducted at three levels: Basic screening checklists (referred to as Tier 1 analysis), linear dynamic analysis (referred to as Tier 2), and nonlinear dynamic analysis and systematic building evaluation (referred to as Tier 3). This paper discusses the results of Tier 1 and Tier 2 evaluations. Tier 1 evaluations involve identifying potential deficiencies by performing a series of simple calculations or basic inspection of building design and construction characteristics. The results of Tier 1 evaluations for four buildings in the Concepcion region, both damaged and undamaged, are summarized here. When deficiencies are identified, Tier 2 evaluations are performed to further investigate the potential deficiencies. A Tier 2 evaluation was conducted for two buildings that are wings of the same building complex. The buildings had similar designs, yet exhibited significantly different damage levels. The results of these Tier 2 evaluations are presented in this paper. Although the simulated demands exceed those allowed for a Tier 2 evaluation to be applicable for determining the seismic adequacy of the structures, the evaluations provided valuable insight into the behavior of structures during the earthquake. The results of a Tier 3 evaluation carried out for the severely-damaged wing using nonlinear response history analysis in Perform-3D, is presented in a companion paper.
