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

本RIA项目的目的是确定地震地面运动中频率非平稳性对结构的非弹性响应和相关损伤的影响。一个新的，通用的随机模型，制定在离散时间和连续时间将表示所需的地面运动的特征。将开发系统识别技术，以根据实际地震记录校准模型。非线性随机振动方法将用于深入了解地震动非平稳性对线性和非线性结构响应的影响。非弹性作用模型将被认为是代表现实的光滑迟滞行为，并逐渐恶化。所进行的研究将使人们更好地了解地震引起的结构破坏及其受各种地面运动参数影响的方式。它还将有助于评估各种激励和系统参数对结构响应和损伤统计的影响和相对重要性。

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.