Use of Fins on Piles for Increased Tension Capacity (Spin-Fin Piles)

摘要

Tension capacity of pipe piles with screw-type fins (spin-fins) is compared to tension capacity of pipe piles with straight fins and without fins. Spin-fin piles are driven piles with welded fin attachments which modify pile behavior under both tensile and compressive loads. Uplift load test results on 2in, 8- 5/8 in, and 16 in diameter piles form the core of the report, and discussion of relative pile characteristics and capacities augments these results. A short summary of the pile test procedures and a graphical summary of pile test results are presented. Advantages and disadvantages of spin-fin piles are summarized and potential applications are presented. Test results indicate that spin-fin piles have the following advantages over unmodified pipe piles; increased ultimate tension and compression capacity; no loss of strength after repetitive loading beyond yield point; and failure mode is progressive, not catastrophic.