Predicting the density of structural timber members in service. The combine use of wood cores and drill resistance data

• Autores: María Jesús Morales Conde, Carmen Rodríguez-Liñán, José Saporiti Machado
• Localización: Materiales de construcción, ISSN 0465-2746, Vol. 64, Nº. 315, 2014
• Idioma: inglés
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• Resumen

  • Drilling devices is used to get information about the cross-section properties and internal defects of structural members. Drill resistance is correlated with density which is often used to predict the mechanical properties of timber elements. However in situ a regression curve cannot be obtained and pre-existent curves provides unreliable predictions. The present paper proposes a procedure for in situ �calibration� of drill resistance data. The �calibration� is based on density values from wood cores taken in the close vicinity of drill holes. Two approaches were tested. One approach based on a regression curve built using wood cores density and drill resistance values obtained from a limited number of members. The other approach uses the information of one wood core to �calibrate� the drill resistance profile taken at the same member. Following this procedure a density prediction is obtained showing a low mean percentage error and a medium coefficient of determination.