A semi-destructive assessment method to estimate the residual strength of maritime pine structural elements degraded by anobiids

João L. Parracha, Manuel F. C. Pereira, António Maurício, José Saporiti Machado, Paulina Faria, Lina Nunes

Research output: Contribution to journalArticle

Abstract

In this article, an assessment method to estimate the residual strength of pine structural elements degraded by anobiids is presented. This novel method was developed in the laboratory to be used in situ and is based on the strength required to withdraw a screw on the surface of degraded timber. Samples of degraded maritime pine (Pinus pinaster Ait.) were submitted to micro-computed tomography (μ-XCT) to quantify density loss. This parameter is highly correlated with mechanical properties thus central for the assessment of timber structural capacity. Density loss values have been correlated with both screw withdrawal force and shear parallel to the grain strength showing significant relationships between these parameters. Using these correlations, the density loss of a degraded element and its shear strength parallel to the grain via the screw withdrawal force can be estimated enabling a valid quantitative assessment of the timber elements residual strength and, therefore, contributing to reduce unnecessary replacement, to boost eco-efficient interventions and to provide foundations required to perform experimental modelling tests.

Original languageEnglish
Article number54
JournalMaterials and Structures/Materiaux et Constructions
Volume52
Issue number3
DOIs
Publication statusPublished - 1 Jun 2019

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Timber
Shear strength
Tomography
Mechanical properties

Keywords

  • Anobiid infestation
  • Damage assessment
  • Micro-computed tomography
  • Screw withdrawal
  • Timber

Cite this

Parracha, João L. ; Pereira, Manuel F. C. ; Maurício, António ; Machado, José Saporiti ; Faria, Paulina ; Nunes, Lina. / A semi-destructive assessment method to estimate the residual strength of maritime pine structural elements degraded by anobiids. In: Materials and Structures/Materiaux et Constructions. 2019 ; Vol. 52, No. 3.
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A semi-destructive assessment method to estimate the residual strength of maritime pine structural elements degraded by anobiids. / Parracha, João L.; Pereira, Manuel F. C.; Maurício, António; Machado, José Saporiti; Faria, Paulina; Nunes, Lina.

In: Materials and Structures/Materiaux et Constructions, Vol. 52, No. 3, 54, 01.06.2019.

Research output: Contribution to journalArticle

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AU - Parracha, João L.

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AU - Machado, José Saporiti

AU - Faria, Paulina

AU - Nunes, Lina

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