All ETDs from UAB

Advisory Committee Chair

Nasim Uddin

Advisory Committee Members

Christopher J Waldron

Jason T Kirby

Document Type

Thesis

Date of Award

2019

Degree Name by School

Master of Science in Civil Engineering (MSCE) School of Engineering

Abstract

Recently, there has been an immense increase in the severity and the frequency of extreme events across the globe. Accordingly, there is a demand for tools that can provide immediate assessment for structures safety after extreme events. This thesis introduces performance curves of wind events for seismically damaged structures. Performance curves are plots that estimates an engineering output (displacement, damage, etc.) knowing the value of certain input demand (applied forces, seismic loads, wind loads etc.). Oftentimes, structural performance is evaluated for independent events (seismic only, wind only, floods etc.). In this study, we will investigate developing performance curves for sequential events. Specifically, the thesis investigated the wind performance of the structure after extreme seismic event. In this study, the author adopted a deterministic approach to develop the performance curves by modeling the structures using the LS-Dyna FEA software. The LS-Dyna is used first to induce seismic damages by applying ground excitation. Afterward, the damaged structure is subjected to wind forces to estimate the performance. Four Seismic Design Levels are considered; service-level earthquake (SLE), design-level earthquake (DLE), maximum considered earthquake (MCE), collapse-level earthquake (CLE). For the last three seismic levels mentioned, the performance curves are derived for four design wind speeds; wind speed for, 10 years Mean Recurrence Interval (10MRI), 25 years Mean Recurrence Interval (25MRI), 50 years Mean Recurrence Interval (50MRI) and 100 years Mean Recurrence Interval (100MRI). The results of this study can be applied to a broad spectrum of structures in the future to generate fragility curves for the wind performance of seismically damaged structures. Keywords:

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