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Title: Behavior of a large-scale pile group subjected to cyclic lateral loading
Authors: University of Texas at Austin. Geotechnical Engineering Center.
United States. Minerals Management Service.
United States. Federal Highway Administration.
United States. Army. Corps of Engineers. Lower Mississippi Valley Division.
Brown, Dan Allen.
Reese, Lymon C., 1917-
Keywords: Cohesive soils
Soil mechanics
Offshore structures
Cyclic lateral loading
Pile groups
Dynamic testing
Publisher: Geotechnical Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Miscellaneous paper (U.S. Army Engineer Waterways Experiment Station) ; GL-88-2.
Description: Miscellaneous Paper
Abstract: A large-scale group of nine steel-pipe piles in a closely spaced arrangement was subjected to cyclic lateral loading with water above the ground surface. The piles were 10.75 in. in diameter and 40 ft long and were installed at a center-to-center spacing of 3-pile diameters. The soils at the Houston, Texas site consisted of a stiff, overconsolidated clay. In an attempt to model storm loading of offshore structures, the loading was electronically controlled to follow a sinusoidal curve of deflection versus time with a 30-sec period. All of the piles in the group were extensively instrumented to obtain measurements of shear in the individual piles and bending moment as a function of depth. Results were compared with the results of a similar load test on a single pile that was about 30 ft away. Several methods of analysis that are currently in use in design were reviewed and the predictions that were made using these methods were compared with measured results. The results emphasize the highly nonlinear nature of the pile-soil-pile interaction. A substantial reduction in ultimate soil resistance was measured in the group piles relative to that of a similarly loaded single pile for both the first cycle and for 100 cycles. Interim recommendations are given for the design of closely-spaced-pile groups subjected to lateral loading. NOTE: This file is very large. Allow your browser several minutes to download the file.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Miscellaneous Paper

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