The influence of stress wave phenomena during Statnamic Load Testing


Middendorp, Bielefeld






First International Statnamic Seminar, Vancouver


The Unloading Point Method (UPM) has become a standard tool for the analysis of Statnamic (STN) load testing signals. The method is based on the assumption that the pile can be modeled as a concentrated mass and springs. Modeling is only valid when stress waves phenomena are minimal. The sensitivity of STN to stress wave phenomena can be characterized by the wave number which is determined by the duration of the STN load, the stress wave velocity and the pile length. With the stress wave program, TNOWAVE simulations have been made for different wave numbers. Conclusions are drawn from the results up to what wave number UPM can be applied reliably. Some measures to correct for stress wave phenomena will be discussed.


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