Resumo

BOJORQUEZ MORA, Edén; TERAN GILMORE, Amador; BOJORQUEZ MORA, Juan  e  RUIZ GOMEZ, Sonia E.. Consideración explícita del daño acumulado en el diseño sismico de estructuras a través de factores de reducción de resistencia por ductilidad. Ing. sísm [online]. 2009, n.80, pp.31-62. ISSN 0185-092X.

A structure that undergoes several cycles of plastic behavior when subjected to a severe seismic excitation can exhibit excessive degradation of its structural properties, and as a consequence failure at deformation levels that are significantly smaller than the one it can develop when subjected to a state of monotonically increasing deformation. Because of this, it is necessary to incorporate into seismic design information that allows for a numerical characterization of the severity of cumulative plastic deformation demands. One practical way to achieve this is to formulate strength reduction factors that take into account the effect of cumulative demands through the definition of a reduced ductility. In this paper, the effect of cumulative damage is incorporated into the definition of strength reduction factors through the use of the Park and Ang damage index. For this purpose, the maximum ductilities that according to this index can be accommodated by single-degree-of-freedom systems located in different zones of the Valley of Mexico are estimated, and strength reduction factors are determined as a function of these ductilities. After discussing the numerical results that are obtained, recommendations are made on how to incorporate the effect of cumulative plastic deformation demands into seismic design.

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