EVALUATION OF WOODEN PURLINS USING THE DRILL RESISTANCE TEST

摘要

This study demonstrated that ultrasonic NDE cannot be used to elucidate the influence of damage in structural components, and it is therefore not appropriate to evaluate old full-scale wooden structures of historical constructions using this method. However, this remains a reliable NDE method that can be used on new components.When using the drill resistance values obtained via the RST method to predict the properties of full-scale new construction materials, taking the resistance values of four different drillings by 90° radial and tangential drilling resulted in a low coefficient of determination R2 in the analysis with E_(b-new), showing a low correlation or no correlation. With 45° radial drilling, the estimated R~2 of E_(b-new) from the regression analysis with Rst_(45r) was 0.2627 (neutral correlation, r = 0.513).