Dynamic Performance of Model Rocking Footings on Sand Reinforced by Soil-Cement Columns
Publication: Geo-Congress 2023
ABSTRACT
This study focuses on the load-deformation response of a heavily loaded rocking footing on sand reinforced by soil-cement columns via centrifuge-model scale shake table tests. In a previous study involving the same footing on unimproved ground, the footing exhibited overturning failure and excessive settlement. To mitigate this, the present study aims to control the kinematics of the footing via strategic ground improvement while maintaining the enhanced energy dissipation characteristic of a rocking footing. The ground improvement technique consists of soil-cement mixed columns, which were cast externally and then placed in the model sand layer during pluviation. Shake sequences are applied to both determine the frequency response of the soil-structure system and induce controlled yielding in the improved soil. The addition of paired soil-cement columns at the ends of the footing was found to significantly reduce settlement during rocking and preserve recentering throughout demanding shaking events.
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Information & Authors
Information
Published In
Geo-Congress 2023
Pages: 178 - 186
History
Published online: Mar 23, 2023
ASCE Technical Topics:
- Continuum mechanics
- Dynamic loads
- Dynamic models
- Dynamics (solid mechanics)
- Engineering fundamentals
- Engineering materials (by type)
- Engineering mechanics
- Footings
- Foundations
- Geomechanics
- Geotechnical engineering
- Load tests
- Materials engineering
- Models (by type)
- Shallow foundations
- Soil cement
- Soil dynamics
- Soil mechanics
- Soil settlement
- Soil stabilization
- Solid mechanics
- Structural dynamics
- Tests (by type)
Authors
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