Influence of Nonstationarity Characteristics of Earthquake Ground Motions on Inelastic Structural Response

本RIA项目的目标是确定地震地面运动的频率非平稳性对非弹性响应的影响以及与之相关的结构的损坏。一种新的，在离散时间和连续时间中建立的通用随机模型将被开发来代表所需的地面运动的特征。将开发系统识别技术，根据真实地震记录对模型进行校准。采用非线性随机振动方法，研究了地震动非平稳性对线性和非线性结构的影响。回应。非弹性作用模型将被认为代表了实际的光滑滞回行为，并逐渐恶化。开展的研究将有助于更好地理解地震对结构造成的破坏，以及不同因素对结构破坏的影响。地震动参数。它还将有助于评估各种激励和系统参数对结构统计的影响和相对重要性。反应和破坏。

The objective of this RIA project is to determine the effects of frequency nonstationarity in the earthquake ground motions on the inelastic response and related damage of structures. A new, versatile stochastic model formulated in both discrete-time and continuous-time will be developed to represent the desired features of the ground motion. System identification techniques will be developed to calibrate the model against real earthquake records. Nonlinear random vibration method will be used to gain insights into the effects of the ground motion nonstationarity on linear and nonlinear structural response. The models of inelastic action will be considered to represent the realistic smooth hysteretic behavior with progressive deterioration. The research undertaken will provide improved understanding of earthquake-induced damage in structures and the way it is influenced by various ground motion parameters. It will also help assess effects and relative importance of the various excitation and system parameters on the statistics of structural response and damage.