Reliability of vibration prognosis by FEM test-site Rotterdam North: Input parameters 2

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  • Document code: 5.21-Betrouwbaarheid nr16
  • Auteur: J.P. Pruiksma, dr. P. Hölscher, W. Gardyn, ea
  • Jaar: 2003

Samenvatting

The aim of the Delft Cluster project 710502 “Betrouwbaarheid van Trillingsprognoses” (“Reliability of vibration prognosis”) was to gain insight in the reliability of predictions of vibration levels.

As part ofthe project, vibration predictions were made and compared with extensive measurements at the testsite Rotterdam North. Vibrations were measured induced by pUe driving, sheet-pile driving, a truck driving over a threshold and falling weight.

The vibration predictions are based on elaborate calculations including finite elements done by Holland Railconsult, GeoDelft, TNO Building and Construction Research and TU Delft. This report describes the input parameters used in the phase 2 predictions.

In the phase 1 predictions, the parties involved determined model input parameters based on the available information on the test site and simulations were made and compared with measurements. This allowed for determining the overal reliability of the vibration prognoses. The input parameters varied significantly among the involved parties due to the different interpretation of the available information. In phase collective set of model input parameters was agreed upon by the parties involved to bring the input of the various prediction models in line as much as possible. This in order to investigate the model uncertainty. These input parameters are described in this report.

A large account for the model uncertainty is attributed to the use of different models for the vibration sources. To gain insight in these differences, the force-time functions resulting from the various source models also have been compared in this report.