Sensors must be attached at the same elevation, typically 1.5 to 2.0 times the pile diameter below the pile head. The -17 standard allows for drilled holes, glue, or threaded studs but sets minimum requirements for resonance frequency.
The standard provides more detailed procedures for evaluating time-dependent effects—specifically, soil setup (capacity gain over time) and relaxation (capacity loss). This is critical for projects in cohesive or sensitive soils. astm d4945-17 pdf
The system records the downward wave and the upward reflection from the soil. Sensors must be attached at the same elevation, typically 1
Enhanced requirements for signal consistency and noise reduction. This is critical for projects in cohesive or sensitive soils
If you are still using older versions (e.g., D4945-12 or D4945-08), the 2017 revision introduced significant technical updates. When searching for an , understanding these changes ensures you are applying the most current methodology.
The mathematical derivation of force (from strain) and velocity (from acceleration) was refined to improve accuracy, particularly for piles with non-uniform cross-sections or composite materials.
In simpler terms, this standard outlines exactly how to test a pile (whether it be a drilled shaft, driven concrete pile, steel pipe pile, or timber pile) by pushing down on it to see how much weight it can hold before settling or failing.