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Dynamic Overturning Loads on Drilled Shaft Footings Used for Minor Service Structures
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1970-01-01
[PDF-1.19 MB]
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Abstract:Ten model tests of drilled shaft footings subjected to dynamic overturning loads were performed. Compared to the average size footing used for minor service structures in Texas, the model footings were reduced by a factor of six. The footing reactions were investigated in a cohesionless sand, a laboratory sandy clay, and a laboratory clayey sand. The results of the dynamic model footing tests were compared with the results obtained from the theory developed earlier in this study for determining static pullover loads. It was found that the footing resistance to single dynamic loads exceeded the static pullover resistance predicted by the theory. Footing rotations due to repeated dynamic loads-did not exceed 1° degree for 10,000 repetitions of dynamic load, with the further limitation that the repeated load was less than 50% of the static pullover load.
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