Dynamic Load Testing of Non-Uniform Piles-PPT Presentation

PPT Presentation

Pdf Summary

The presentation discusses advances in dynamic load testing (DLT) for non-uniform piles. Traditional field methods, including CASE analysis and iCAP, have often been used successfully, but they are less suited to piles with changing geometry or material properties. The presentation argues that, as with the move beyond the empirical ENR formula, more reliable analysis is needed.<br /><br />Signal-matching programs such as CAPWAP typically require pile configuration details to be entered after data collection, so they do not provide real-time analysis of non-uniform piles. N_GAPA addresses this limitation: users enter the pile’s non-uniform properties before testing, enabling instant analysis of each impact. Its field version, iN_GAPA, can also use results from N_GAPA to help improve subsequent blows. Unlike iCAP, it is intended for both uniform and non-uniform piles.<br /><br />The presentation reviews externally mounted, reusable sensors and embedded data collectors, which are generally sacrificial and can measure at multiple pile levels. It illustrates non-uniform piles including steel pipe piles with restrictor plates, tapered and heterogeneous timber piles, stinger piles, and concrete piles with changing sections. Timber piles may require four strain gauges because their material properties and load transfer can vary around the pile.<br /><br />The key recommendations are to use four strain gauges when needed, enter the pile configuration before driving, and apply real-time monitoring to assess stresses and capacities in non-uniform piles.

Keywords

dynamic load testing

non-uniform piles

CAPWAP

N_GAPA

iN_GAPA

pile driving

strain gauges

real-time analysis

signal matching

pile geometry