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Published May 30, 2014 | Submitted
Report Open

Cyclic Lateral Loading of Piles; Analysis of Centrifuge Tests


In two previous reports (6,7) results were given of a number of cyclic lateral load tests on model piles loaded in a centrifuge. The tests results were obtained in the form of loads and deflections at the top of the pile and readings from strain gauges distributed down the pile; the latter are interpreted in the form of moments. In contrast to field tests, the centrifuge pile experiments are carried out in an extremely uniform medium consisting, in the tests discussed, of dry and wet sand in two test series. The result of this soil uniformity is that moment readings can be represented by a smooth and continuous curve. Erratic data due to alternately dense and loose soil layers are avoided. In the second report (7) the fitting of curves to this data was discussed briefly with reference to the use of a fifth-order spline function. The advantage of the technique is that the curve passes through all the data points in contrast with least squares or linear regression fits. In the latter, general curves are obtained representative of the pile deflections in some way which pass near but not necessarily through the data points. Errors in the data are inherently accepted in this method.

Additional Information

Report Through May 31, 1979 Research Program for American Petroleum Institute OSAPR Project 13. John Lee built the apparatus and performed the tests analyzed here. Some of the analysis was done by M. J. Craig. J.-P. Bardet assisted in verifying and carried out calculations of the work in Appendix A. The report was typed by Mrs. G. Jackson.

Attached Files

Submitted - Cyclic_Lateral_Loading_of_Piles;_Analysis_of_Centrifuge_Tests.pdf

Submitted - Cyclic_Lateral_Loading_of_Piles=003b_Analysis_of_Centrifuge_Tests.pdf


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