High Strain Dynamic Load Testing using the Pile Driving Analyzer from Pile Dynamics is used for measuring and determining the effects of impacts on a deep foundation element such as a driven pile. The impact is often applied by the pile driving hammer on a driven pile, but the impact may also be imposed by a large drop weight applied to a bored or augured pile, or drilled shaft. The PDA monitors acceleration and strain sensors which are attached to the pile by bolts, and processes these signals after each impact during driving or re-strike. The signals are digitized by the Pile Driving Analyzer. Results are computed, and the data array of the signals for a blow is stored.

Generally, the high strain dynamic load test is performed to estimate:

• The pile bearing capacity.
• Compression stresses induced at top and bottom.
• Tension stresses along the pile.
• Energy transferred to the pile and pile integrity

The procedures for dynamic pile testing have been performed in accordance with the ASTM standard D4945 (Standard Test Method for High-Strain Dynamic Testing of Deep Foundations).