Evaluation of Structural Reliability of Steel Frames Considering Cumulative Damage

Abstract eng:
The structural reliability of mid-rise steel buildings located in the Lake Zone of Mexico City is evaluated. Two earthquake demand parameters are used for this purpose: a) Maximum interstory drift; and b) Normalized plastic hysteretic energy. The buildings, designed according to the Mexico City Building Code (RCDF-2004), have a structural system constituted by regular moment-resistant steel frames. The demand hazard curves of the buildings are expressed in terms of both parameters. The curves are compared and used to provide a general idea of the reliability levels associated to the set of buildings. Large differences are observed in the structural reliabilities derived from the maximum interstory drift and the normalized plastic hysteretic energy. In particular, the reliability levels obtained through the use of normalized plastic hysteretic energy tend to decrease considerably with respect to those derived from maximum interstory drift at state of structural failure.

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