The influence of stress wave phenomena during Statnamic Load Testing

Author(s):

Middendorp, Bielefeld

Year:

1995

Language:

English

Where:

First International Statnamic Seminar, Vancouver

INTRODUCTION:

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 modelled as a concentrated mass and springs. Modelling is only valid when stress waves phenomena are of minimal. The sensitivity of STN to stress wave phenomena can be characterised 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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