Continuing Investigation of Strand Slippage in 24 Inch Octagonal PrestressedConcrete Piles

摘要

The objective of the current research is to investigate the problem of excessiveslippage in prestressed piles. From the measurements taken in the field, it is apparent that the problem of excessive initial strand slip is not limited to the 24 inch octagonal piles. The problem is independent of pile shape and size. The slippage is evident in piles of different manufacturers in different states in the Southeast. Excessive slippage was found in both the top and bottom of the cross-section of the piles, although the top portion of the cross-section generally exhibited higher initial slip. These observations lead to the conclusion that the problem is considerably more widespread and systematic than what was originally reported.