Closure to 'Load Transfer Curve Analyses of Drilled Shafts Using Crosshole Sonic Logging Test' by Won-Taek Hong, Seung Yong Shin, Min-Chul Park, Jong-Sub Lee, and Myung Jun Song

摘要

We express our sincere appreciation to the discusser's valuable discussion of our study, "Load Transfer Curve Analyses of Drilled Shafts Using Crosshole Sonic Logging Test." The discusser has discussed (1) information on concrete properties; (2) uncertainty in the measured P-wave velocity; and (3) incompatibility of the elastic moduli obtained by uniaxial compression test and crosshole sonic logging test.The purpose of the original study is to estimate the nonlinear stiffness of the drilled shaft with the aim of improving its erroneous load transfer curve. To this end, we focused on the analysis of the nonuniform cross-sectional area and the nonhomogeneous elastic modulus based on the concrete placement record and P-wave velocity to estimate the nonhomogeneous stiffness of the drilled shaft. We agree with the discusser's comment regarding information on the concrete properties. However, the nonhomogeneous elastic modulus is expected to arise from the discrepancies between the properties of the concrete specimen and the placed low-quality concrete. Hence, we excluded the properties of the concrete specimen to avoid confusion that can be caused by the discrepancies.