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Field Experiment of Rocking Shallow Foundation on Cohesive Soil Subjected to Lateral Cyclic Loads
Rocking shallow foundations may act as a good mechanism for base isolation that limits the seismic force to the superstructure during strong seismic events; however, a lack of comprehensive field investigation might have limited the use of rocking foundation. This paper presented a field study of a rocking shallow foundation resting on a natural soil deposits in Alberta, Canada. The foundation system consisted of a 1.5 m by 1.0 m concrete footing, column, and deck to simulate a prototype bridge system. A geotechnical investigation was carried out to determine soil conditions before and after the experiments. The footing was subjected to slow cyclic loading which consists of 4 to 5 packets of which each contain 3 to 4 cycles of similar displacement amplitude. The drift ratio was increased to a maximum of 5%. The estimated factors of safety against bearing failure ranges from 4 to 22. Nonlinear behaviour of the foundations and underlying soil was evident; changes in the physical and mechanical properties of underlying soils were characterized. Energy dissipation, residual settlement, and stiffness degradation observed in the tests were discussed.
Field Experiment of Rocking Shallow Foundation on Cohesive Soil Subjected to Lateral Cyclic Loads
Rocking shallow foundations may act as a good mechanism for base isolation that limits the seismic force to the superstructure during strong seismic events; however, a lack of comprehensive field investigation might have limited the use of rocking foundation. This paper presented a field study of a rocking shallow foundation resting on a natural soil deposits in Alberta, Canada. The foundation system consisted of a 1.5 m by 1.0 m concrete footing, column, and deck to simulate a prototype bridge system. A geotechnical investigation was carried out to determine soil conditions before and after the experiments. The footing was subjected to slow cyclic loading which consists of 4 to 5 packets of which each contain 3 to 4 cycles of similar displacement amplitude. The drift ratio was increased to a maximum of 5%. The estimated factors of safety against bearing failure ranges from 4 to 22. Nonlinear behaviour of the foundations and underlying soil was evident; changes in the physical and mechanical properties of underlying soils were characterized. Energy dissipation, residual settlement, and stiffness degradation observed in the tests were discussed.
Field Experiment of Rocking Shallow Foundation on Cohesive Soil Subjected to Lateral Cyclic Loads
Sharma, Keshab (author) / Deng, Lijun (author)
Geotechnical Earthquake Engineering and Soil Dynamics V ; 2018 ; Austin, Texas
2018-06-07
Conference paper
Electronic Resource
English
Field Experiment of Rocking Shallow Foundation on Cohesive Soil Subjected to Lateral Cyclic Loads
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