Abstract
In this study, the seismic response and the reliability of elasto-plastic structures were treated by taking the stiffness degradation into consideration. The nonstationary seismic input was assumed to have not only a time-varied envelope but also time-varied spectral density. Effects of the nonstationary variations on the response and threshold-crossing probability of the structure were studied by taking the resonance frequency change due to the stiffness degradation of multi-component structure into account. The restoring force characteristics of each component was represented by a simplified Clough model and has various yielding levels. The covariance of response, the first passage probability, stiffness degradation rate and plastic deformation rate were computed using equivalent linearization techniques on the assumption of a narrow band response. These results were compared by digital computer simulation.
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