Strength Degradation Modelling of Structures Subjected to Earthquakes and Fire

Abstract eng:
Economic considerations dictate that building structures be able to resist extreme events, such as a major earthquake or a fire, without collapse but with some structural damage. This makes it imperative for design to be based on nonlinear analysis that incorporates strength degradation. This study examines the complexities associated with modelling degradation of strength in structures for seismic and high temperature environments. It is shown that both dynamic and high temperature analyses are akin to displacement controlled static analysis. If appropriate numerical procedures are used, strength degradation does not result in dynamic instability often associated with this phenomenon. Inclusion of strength degradation as a material property can lead to results that are sensitive to model discretisation for both dynamic and high temperature loadings.

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