Modeling of nonstationary earthquake ground motion and biaxial and torsional response of inelastic structures
Yeh, Chin-Hsun
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https://hdl.handle.net/2142/21804
Description
Title
Modeling of nonstationary earthquake ground motion and biaxial and torsional response of inelastic structures
Author(s)
Yeh, Chin-Hsun
Issue Date
1989
Doctoral Committee Chair(s)
Wen, Y.K.
Department of Study
Civil and Environmental Engineering
Discipline
Civil Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Civil
Language
eng
Abstract
A systematic way to analyze the response of inelastic structures under bi-directional random excitations is developed. Most of the system and excitation characters have been considered, e.g., hysteretic behavior of restoring force, biaxial interaction, torsional response and degradation of the structure, and nonstationary behavior of ground excitation. A new stochastic ground motion model is proposed in which both intensity and frequency content are functions of time. Corresponding methods for estimating the model parameters based on actual earthquake records are also given. The proposed ground motion model can be efficiently applied to simulations as well as analytical solutions of random vibration and reliability studies for inelastic structures. Responses of single-mass inelastic systems and three-story space frames, with or without deterioration, under bi-directional non-stationary ground excitations are investigated via an equivalent linearization method and Monte Carlo simulations. The results show that (1) the equivalent linearization method predicts the response statistics quite well except for r.m.s. displacement, which can be improved by the proposed semi-empirical equation; (2) the time-varying frequency content of ground excitation has significant effects on the response of inelastic structures, especially when the excitation dominant frequencies are close to the structural pre-yielding natural frequency; (3) biaxial and torsional response may become significant in an asymmetric structure.
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