Considerations for Measuring Residual Stresses in Driven Piles with Vibrating Wire Strain Gauges

Vibrating wire strain gauges are often the preferred technology for measuring in driven piles. However, residual after pile driving is challenging to accomplish using vibrating gauges. The process can cause a shift no-load reading from relaxation of locked-in manufacturing strains or gauge tension. Also, there temperature effects installing piles below ground. A test program was developed steel H-piles instrumented with were subjected dynamic forces by striking against plate an attempt relax prior installation. and thermistors connected data logger during record changes following It observed that applying impact installation resulted 0–5 ?? (microstrain). Temperature cooler ground excess 60 some concluded temperature-induced shifts must be measured interpret stresses.