Document Type thesis Author Name Mitchell, Ryan URN etd-041812-134324 Title A WANFIS Model for Use in System Identification and Structural Control of Civil Engineering Structures Degree MS Department Civil & Environmental Engineering Advisors Yeesock Kim, Advisor Tahar El-Korchi, Department Head Leonard Albano, Committee Member Keywords system identification structural control neural network fuzzy logic wavelet transform earthquake Date of Presentation/Defense 2012-04-17 Availability unrestricted
With the increased deterioration of infrastructure in this country, it has become important to find ways to maintain the strength and integrity of a structure over its design life. Being able to control the amount a structure displaces or vibrates during a seismic event, as well as being able to model this nonlinear behavior, provides a new challenge for structural engineers. This research proposes a wavelet-based adaptive neuro- fuzzy inference system for use in system identification and structural control of civil engineering structures. This algorithm combines aspects of fuzzy logic theory, neural networks, and wavelet transforms to create a new system that effectively reduces the number of sensors needed in a structure to capture its seismic response and the amount of computation time needed to model its nonlinear behavior. The algorithm has been tested for structural control using a three-story building equipped with a magnetorheological damper for system identification, an eight-story building, and a benchmark highway bridge. Each of these examples has been tested using a variety of earthquakes, including the El-Centro, Kobe, Hachinohe, Northridge, and other seismic events.
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