Distribution of Residual Load and True Shaft Resistance for a Driven Instrumented Test Pile Reply to Discussion

correlating it to the compressive strength of the concrete. We did not elaborate on these points in the paper, as the objective of the paper was to present the results of the case study, not to detail the structural design of the piles at the site. In addressing general principles as a background to the PHC pile, we suggested general and conservative limit values of strain (1,500 µe) and combined E-modulus (30 GPa) be used for determining the nominal limit stress (structural axial strength) of the PHC pile. The discussers mention that the limit strain could be as high as 2,000 µe. Using the actual relations for the pile modulus of the test piles and applying the mentioned strain limits gives maximum load values of about 6,800 to about 8,700 kN for the Myeongji test pile, and about 11,000 to about 13,500 kN for the Shinho test pile. The design needs to apply a suitable factor of safety to these limits, of course.