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Title: Inelastic seismic response assessment of moment resisting steel frames
Author: Kumar, Mukesh
Awarding Body: Imperial College London
Current Institution: Imperial College London
Date of Award: 2012
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To improve the predictability of structural and non-structural damage of structures for a given hazard scenario, it is essential to identify factors that influence the response and evaluate their contribution. Several studies have therefore focused on the assessment of parameters that influence the inelastic response of structures under seismic loading. However, these studies have in most cases been limited to single degree of freedom (SDF) systems and generic frames with controlled strength and stiffness distribution characteristics. In addition to this, the influence of the frequency content of ground motion on the inelastic response of structures has not been fully explored and utilized. Therefore, this thesis aims to understand the influence of frequency content and key properties of structure, designed to Eurocode provisions, on the inelastic response. A suitable frequency content measure that can be related to magnitude, distance and site characteristics of an earthquake event, and easily adopted as a design input, is selected from the available literature in order to understand the influence of frequency content. The applicability of the selected parameter is first explored and established by studying the inelastic displacement demand of SDF systems as well as global drift, base shear and maximum storey drift profile of a selected multi-degree freedom (MDF) system, using a suite of 128 far-field ground motion records. Subsequently, incremental dynamic analysis of a large set of moment resisting steel frames designed to Eurocode 8 is conducted using 72 far-field ground motion records. The influence of salient structural properties on the inelastic drift and strength demands and their interaction with frequency content is investigated. Based on extensive parametric studies, regression models are developed as a function of the parameters that influence drift and strength demands of the frames. Finally, implications of the findings on current seismic design and assessment provisions, with emphasis on the guidelines of Eurocode 8, are discussed. Furthermore, recommendations are proposed for future work that can lead to further improvements in codified procedures.
Supervisor: Elghazouli, Ahmed ; Stafford, Peter Sponsor: NED University of Engineering & Technology
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available