The objective of this paper is to present a theoretical evaluation of the capabilities of low strain integrity tests in estimating the pile length and integrity of PCC pile

a type of large diameter thin-wall cast-in-place concrete pile. One-dimensional and three-dimensional finite element modelling are performed to gain an understanding of the dynamic response of intact and defective PCC pile subjected to impulse loads. The three-dimensional effects in low strain integrity test of PCC pile are studied in detail. The result shows that the impact response of a PCC pile is affected by bending vibration

longitudinal vibration and waves reflected between the side boundaries at the surface of pile top. Based on the numerical results

suggested guidelines for selection of the locations of the hammer impact point and the recording point and test results interpretation of this new type of pile are given.