Seismic fragility assessment of infilled frames subject to mainshock/aftershock sequences using a double incremental dynamic analysis approach

The paper presents an assessment framework aimed at evaluating seismic fragility and residual capacity of masonry infilled reinforced concrete (RC) frames subject to mainshock/aftershock sequences. A double incremental dynamic analysis (D-IDA) approach is used, based on the combination of a mainshoc...

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Veröffentlicht in:Bulletin of earthquake engineering Jg. 17; H. 1; S. 211 - 235
Hauptverfasser: Di Trapani, Fabio, Malavisi, Marzia
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Dordrecht Springer Netherlands 01.01.2019
Springer Nature B.V
Schlagworte:
Aftershocks
Capacity
Civil Engineering
Computer simulation
Dynamic analysis
Earth and Environmental Science
Earth Sciences
Earthquakes
Economic impact
Environmental Engineering/Biotechnology
Failures
Fragility
Frame structures
Frameworks
Geophysics/Geodesy
Geotechnical Engineering & Applied Earth Sciences
Hydrogeology
Infilled frames
Masonry
Original Research
Redevelopment
Reinforced concrete
Seismic activity
Seismic response
Shear
Structural Geology
Fiber-section
Masonry infilled frames
Incremental dynamic analysis
Fragility curves
Reinforced concrete
OpenSees
ISSN:1570-761X, 1573-1456
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Zusammenfassung:The paper presents an assessment framework aimed at evaluating seismic fragility and residual capacity of masonry infilled reinforced concrete (RC) frames subject to mainshock/aftershock sequences. A double incremental dynamic analysis (D-IDA) approach is used, based on the combination of a mainshock (MS) signal at different intensities with a set of spectrum-compatible aftershocks (AS) scaled in amplitude with respect to peak ground acceleration. Limit state functions, specifically defined for infilled frames, are used to detect chord-rotation exceeding and shear collapse of RC members during standard and double incremental dynamic analyses. Intact and aftershock fragility curves are obtained for a reference full-scale RC frame specimen, by simulating seismic response with and without infills through a fully fiber section model developed in OpenSees. D-IDA results allow also defining aftershock residual capacity domains and loss diagrams, which are used to compare responses of bare and infilled frames subject to increasing MS intensities. Results show that masonry infills can drastically reduce seismic fragility of RC frame structures during main events and AS, and also limit and economic losses for the mid-low intensity earthquakes. Such beneficial contributions, however, depend on the capacity of RC members to support additional shear demand due frame-infill interaction and avoid sudden failures which conversely occur.
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ISSN:1570-761X
1573-1456
DOI:10.1007/s10518-018-0445-2