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• W2611813391 abstract "Author(s): Liang, Xiao | Advisor(s): MOSALAM, KHALID M | Abstract: The performance-based earthquake engineering (PBEE) approach, developed at the Pacific Earthquake Engineering Research (PEER) Center, aims to robustly decompose the performance assessment and design process into four logical stages that can be studied and resolved in a systematic and consistent manner. However, two key challenges are experienced in this approach, namely the accurate seismic structural analysis and the selection and modification of ground motions (GMs). This dissertation investigates these two challenges with application to reinforced concrete (RC) bridge systems.In nonlinear structural dynamics, the most accurate analytical simulation method is the nonlinear time history analysis (NTHA). It involves the use of different types of direct integration algorithms and nonlinear equation solvers where their stability performance and convergence behaviors are of great significance. Lyapunov stability theory, the most complete framework for stability analysis of dynamical systems, is introduced in this study. Based on this theory, a new nonlinear equation solver is developed and its convergence performance was theoretically formulated and verified by several examples. Stability is one of the most important properties of direct integration algorithms that must be considered for efficient and reliable NTHA simulations. Two Lyapunov-based approaches are proposed to perform stability analysis for nonlinear structural systems. The first approach transforms the stability analysis to a problem of existence, that can be solved via convex optimization. The second approach is specifically applicable to explicit algorithms for nonlinear single-degree of freedom and multi-degree of freedom systems considering strictly positive real lemma. In this approach, the stability analysis of the formulated nonlinear system is transformed to investigating the strictly positive realness of its corresponding transfer function matrix.Ground motion selection and modification (GMSM) procedures determine the necessary input excitations to the NTHA simulations of structures. Therefore, proper selection of the GMSM procedures is vital and an important prerequisite for the accurate and robust NTHA simulation and thus for the entire PBEE approach. Although many GMSM procedures are available, there is no consensus regarding a single accurate method and many studies focused on evaluating these procedures. In this dissertation, a framework for probabilistic evaluation of the GMSM procedures is developed in the context of a selected large earthquake scenario with bidirectional GM excitations.In urban societies, RC highway bridges, representing key components of the transportation infrastructure systems, play a significant role in transporting goods and people around natural terrains. Therefore, they are expected to sustain minor damage and maintain their functionality in the aftermath of major earthquakes, which commonly occur in California due to many active faults. Accurate seismic structural analysis of existing and newly designed RC highway bridges is fundamental to estimate their seismic demands. As such important lifeline structures, RC highway bridge systems are investigated as an application of the previously discussed theoretical developments proposed in this dissertation to address the two key challenges in the PEER PBEE approach." @default.
• W2611813391 created "2017-05-12" @default.
• W2611813391 creator A5025952499 @default.
• W2611813391 date "2016-01-01" @default.
• W2611813391 modified "2023-09-23" @default.
• W2611813391 title "Performance-Based Robust Nonlinear Seismic Analysis with Application to Reinforced Concrete Bridge Systems" @default.
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• W2611813391 doi "https://doi.org/10.13140/rg.2.2.20197.09440" @default.
• W2611813391 hasPublicationYear "2016" @default.
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