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Performance Based Seismic Assessment of Masonry Infilled Steel Frame Structures

Nassirpour, Arash; (2018) Performance Based Seismic Assessment of Masonry Infilled Steel Frame Structures. Doctoral thesis (Ph.D), UCL (University College London).

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Abstract

Steel framed structures constitute a considerable proportion of residential and commercial structures in earthquake prone regions. In such structures, typically, masonry infills are implemented as walls and partitions. However, in common practice, the influence of the infill panels on the performance and resistance of the building is mostly ignored, not just at the design stage, but also during assessment. Despite the possible strength enhancement that infill panels can bring to the structure for modest earthquakes, they may put the building at high risk of heavy damage if their impact is overlooked, and the interaction not properly designed, as seen in the 2003 Bam earthquake and many other destructive seismic events. Following the performance-based seismic assessment methodology, the dissertation focuses on evaluating the seismic performance of existing masonry infilled steel frames. The seismic response of several building typologies, designed according to common practice, is assessed through nonlinear dynamic methods. Detailed three-dimensional numerical models of selected index buildings are developed, capable of simulating the impact of masonry infill walls along other critical elements such as the beam-column connections, according to available empirical and experimental data. In order to measure the seismic vulnerability, along with possible losses and life cycle costs, analytical fragility functions are derived for the structures, while considering the hazard characteristics of the location under study. The derived fragility functions will help enrich the limited library of existing function dedicated to both bare and infilled steel structures. The outcome is of great importance for insurance valuation, as well as managing disasters and performing strengthening if necessary.

Type: Thesis (Doctoral)
Qualification: Ph.D
Title: Performance Based Seismic Assessment of Masonry Infilled Steel Frame Structures
Event: UCL (University College London)
Language: English
Keywords: Earthquake Engineering, Vulnerability Assessment, Analytical Fragility Function, Life Cycle Cost, Seismic Design, Seismic Analysis, Steel Frame, Masonry Infill, Nonlinear Dynamic Analysis, Multiple-Stripe Analysis.
URI: http://discovery.ucl.ac.uk/id/eprint/10052986
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