A Performance-Based Wind Engineering Framework for Vertical Structures Subjected to Nonstationary Wind Loads by Viet Quoc Le Doctor of Philosophy in Civil Engineering Northeastern University Associate Professor Luca Caracoglia, Chair Regarded as a rational analytical approach that enables more risk-informed decision making, performance-based engineering (PBE) has been widely endorsed by the wind engineering community for the design and analysis of vibrationsensitive structures such as tall

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... ings. Accomplished through modular stages that delineate a structure's capacity to satisfy performance objectives, the uncertainties, error propagation, and random properties of the structural system, the environmental hazard, and the estimation of losses incurred from damages can be systematically examined with great detail. This multi-faceted, holistic approach xiii 7.7 At angle of attack α = 0 • , ensemble-averaged, normalized, one-sided EPSD of fluctuating base moments: (a) m y and (b) m x . . . . . . . . . . . 211 7.8 EPSD at three time instants (non-dimensional time s = tŪ ST A /D) for: (a) m y at α = 0 • , (b) m x at α = 0 • , (c) m y at α = 90 • and (d) m x at α = 90 • . 212 7.9 Flowchart to synthetically generate generalized forces using a modified quasi-steady approach.