Influence of the Earthquake Ground Motion Process and Structural Properties onResponse Characteristics of Simple Structures

摘要

In the study, a quantitative description of the uncertainty or inherentvariability of earthquake ground motion input into structures is proposed. It utilizes a time-varying discrete ARMA stochastic process able to reliably capture the amplitude and frequency nonstationarities typical of real earthquake records. The ARMA earthquake models are estimated using (i) Kalman filtering with a state-space formulation of the ARMA model and (ii) a more traditional nonstationary estimation technique based on the concept of a stationary moving time window. Two real very different earthquake records are analyzed and simulated using the proposed ARMA modeling procedure. The fitted earthquake models are used as seismic input into simple elastic and inelastic structural models. The results of the study can be directly used for seismic reliability assessment of simple structures using formal reliability theory.