Eighth International Conference on Case Histories in Geotechnical Engineering
Centrifuge Investigation of the Effects of Liquefiable Soil Interlayering and Structural Strength on the Seismic Performance of Soil-Structure Systems
Publication: Geo-Congress 2019: Earthquake Engineering and Soil Dynamics (GSP 308)
ABSTRACT
This paper discusses the results of dynamic centrifuge tests performed on 9-story model structures with different yield capacities founded on a layered liquefiable deposit with and without a silt cap. The goal was to evaluate the interacting role of soil interlayering and structure’s yield capacity on the response of soil-foundation-structure systems. The first test evaluated the seismic performance of a 9-story, steel, moment-resisting frame structure (B1) on a layered liquefiable deposit without a silt cap. The second test simulated simultaneously two models of a 9-story structure (B1 and B2) on a similar soil profile, but with a silt cap. Structure B2 was designed to have a greater yield capacity compared to B1, with other dynamic properties kept constant. The presence of a silt cap and resulting void redistribution did not notably change Structure B1’s average settlement, but it amplified residual rotations, foundation, and roof accelerations, and deformation demands on the superstructure. The stronger Structure B2 also experienced large rotations but less than B1, because of smaller flexural deflections and P-Δ moments imposed about its columns and foundation. These results point to the importance of characterizing soil interlayering as well as structure’s strength and other dynamic properties when evaluating the consequences of liquefaction.
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ACKNOWLEDGMENTS
This material is based upon work supported in part by the National Science Foundation (NSF) under Grant No. 1362696. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the NSF. The authors would also like to thank Dr. Peter Kirkwood, Mr. Mahir Badanagki, and Dr. Juan Olarte for their assistance in centrifuge model preparation and testing.
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Information & Authors
Information
Published In
Geo-Congress 2019: Earthquake Engineering and Soil Dynamics (GSP 308)
Pages: 66 - 75
Editors: Christopher L. Meehan, Ph.D., University of Delaware, Sanjeev Kumar, Ph.D., Southern Illinois University Carbondale, Miguel A. Pando, Ph.D., University of North Carolina Charlotte, and Joseph T. Coe, Ph.D., Temple University
ISBN (Online): 978-0-7844-8210-0
Copyright
© 2019 American Society of Civil Engineers.
History
Published online: Mar 21, 2019
Published in print: Mar 21, 2019
ASCE Technical Topics:
- Centrifuges
- Construction equipment
- Earthquake engineering
- Earthquake resistant structures
- Engineering fundamentals
- Equipment and machinery
- Geomechanics
- Geotechnical engineering
- Seismic tests
- Silt
- Soil liquefaction
- Soil mechanics
- Soil properties
- Soil strength
- Soil structures
- Soils (by type)
- Structural behavior
- Structural engineering
- Structural strength
- Structures (by type)
- Tests (by type)
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