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Seismic Vulnerability of Flat
Slab Structures |
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M. Altug Erberik Post-Doc Fellow, UIUC, |
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Flat-slab systems exhibit several
advantages such as providing architectural flexibility, more clear space,
lower building height, easier formwork, and consequently shorter construction
time. However, a serious problem in flat-slab construction is the potentially
large transverse displacements observed under earthquake ground motion. In
spite of their wide use and their distinct response patterns, there are no
fragility curves (relationships between ground motion severity and the
probability of reaching or exceeding a specified limit state), required for
seismic damage and loss assessment. The study focuses on the derivation of
the fragility curves for flat-slab construction and the employment of this
fragility information in loss estimation analysis using FEMA’s HAZUS. The
analyses are carried out using medium-rise flat slab buildings with masonry
infill walls. Following a sensitivity analysis to determine the effect of
randomness in a number of strength characteristics, randomness in steel yield
strength and concrete compressive strength is considered in the generation of
the sample to be analyzed. A carefully selected ensemble of earthquake
records is employed to represent variability in ground motion; the records
are scaled using their displacement spectra. Inelastic response-history
analysis is used to analyze the random sample of structures subjected to the
ten records scaled in terms of displacement spectral ordinates, and four
limit states are monitored. The ensuing fragility curves are examined
carefully and verified by comparison to curves derived for moment-resisting
RC frames for which there is an abundance of information. Then the derived
fragility curves are further modified to fit into HAZUS format. The
HAZUS-compatible curves are employed in the loss estimation analysis in which
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Sponsored by the Grainger Library Commons Room |
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