Performance-based seismic assessment of a large diameter extended pile shaft in a cohesionless soil
The seismic behavior of a large diameter extended pile shaft founded on a dense sandy site is investigated in this paper. First, a deterministic analysis is conducted including both nonlinear dynamic analysis (NDA) and pushover analysis to gain insights into the behavior of the pile and make sure an appropriate modeling technique is utilized. Then a probabilistic analysis is performed using the results of NDA for various demands. To this end a set of 40 pulse-like ground motions are picked and subsequently 40 nonlinear dynamic and pushover analyses are performed. The data obtained from NDA are used to generate probabilistic seismic demand model (PSDM) plots and consequently the median line and dispersion for each plot are computed. The NDA and pushover data are also plotted against each other to find out to what extent they are correlated. These operations are done for various engineering demand parameters (EDPs). A sensitivity analysis is done to pick the most appropriate intensity measure (IM) which would cause a minimum dispersion in PSDM plots out of 7 different IMs. Peak ground acceleration (PGA) is found to be the most appropriate IM. Pushover coefficient equations as a function of PGA are proposed which can be applied to the pushover analysis data to yield a better outcome with respect to the NDA. At the end, the pacific earthquake engineering research (PEER) center methodology is utilized to generate the fragility curves using the properties obtained from PSDM plots and considering various states of damage ranging from minor to severe. The extended pile shaft shows more vulnerability with a higher probability with respect to minor damage compared to severe damage.
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Availability:
- Find a library where document is available. Order URL: http://worldcat.org/issn/16713664
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Supplemental Notes:
- Copyright © 2015, Institute of Engineering Mechanics, China Earthquake Administration and Springer-Verlag Berlin Heidelberg.
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Authors:
- Ghotbi, Abdoul R
- Publication Date: 2015-3
Language
- English
Media Info
- Media Type: Web
- Features: Figures; References; Tables;
- Pagination: pp 177-188
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Serial:
- Earthquake Engineering and Engineering Vibration
- Volume: 14
- Issue Number: 1
- Publisher: Springer
- ISSN: 1671-3664
- EISSN: 1993-503X
- Serial URL: http://link.springer.com/journal/11803
Subject/Index Terms
- TRT Terms: Bridge foundations; Dynamic structural analysis; Earthquake resistant design; Granular soils; Pile foundations; Sandy soils; Seismicity; Soil structure interaction
- Subject Areas: Bridges and other structures; Design; Geotechnology; Highways; I42: Soil Mechanics;
Filing Info
- Accession Number: 01556977
- Record Type: Publication
- Files: TRIS
- Created Date: Mar 16 2015 11:35AM