Abstract
In geotechnical structural design, it is very common to transform the measurements obtained in soil investigations, such as SPT-N or CPT-qc, into geotechnical parameters that are directly used in design calculations. The error of these transformations, i.e. transformation errors, is one of the characteristic sources of uncertainty in geotechnical design, and it generally imposes quite a large uncertainty due to its dependence on past experience. The purpose of this paper is to extensively quantify the transformation error in geotechnical structural design through a review of available literature. Furthermore, the practical applicability of these transformation formulas is examined based on a comparison with spatial variability and statistical estimation errors in measurements such as SPT-N.
