Zerstörungsfreie Prüfung von Holz: Ein „in situ”-Verfahren zur Bestimmung der Rohdichte

Görlacher, Rainer

doi:10.1007/bf02608673

Cited by 35 publications

(13 citation statements)

References 3 publications

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“…The former includes, among others, the application of ultrasonic and vibration methods. The latter includes the Resistograph R (Rinn, 1992) and the Pilodyn R (Görlacher, 1987), which usually plays a major role in the support of visual inspection of wooden elements and, consequently, structures. GTM represent techniques difficult to implement in-situ, more appropriate to laboratory facilities.…”

Section: Inspection and Non-destructive Evaluationmentioning

confidence: 99%

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Structural analysis of two King-post timber trusses: Non-destructive evaluation and load-carrying tests

Branco

Piazza

Cruz

2010

Construction and Building Materials

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The misunderstanding of the overall behaviour of traditional timber trusses can result in incorrect strengthening interventions or, frequently, on their replacement. Timber roof structures need a more concise knowledge of the real behaviour to determine internal loads and control the load transfer. For that, laboratory tests on scaled or full-scale specimens of members, connections and trusses are needed. In this paper, an accurate geometric and mechanical evaluation of the timber elements of two King-post timber trusses, based on grading results with data gathered from non-destructive tests (NDT), including mechanical evaluation of the modulus of elasticity in bending (MoE), followed by full-scale carrying tests were performed. The trusses were reassembled in laboratory and submitted to a series of symmetric and non-symmetric cyclic tests, according to the Limit States. Strengthening techniques evaluated in precedent research steps were used in a second phase of the load-carrying tests.

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Section: Inspection and Non-destructive Evaluationmentioning

confidence: 99%

“…The depth of penetration is correlated with material density. Görlacher (1987) developed relationships between the depth of penetration of a standard pin and the density of the wood. The correlation coefficient varied from 0.74 to 0.92, depending on the number of measurements and species.…”

Section: Pilodyn Rmentioning

confidence: 99%

Structural analysis of two King-post timber trusses: Non-destructive evaluation and load-carrying tests

Branco

Piazza

Cruz

2010

Construction and Building Materials

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“…NDT such as ultrasound and stress waves, but also Pilodyn hammer type equipment: The use of the Pilodyn hammer to determine the density is well documented for measurements on standing trees, sawn timber and timber suffering from decay, [4]. Ronca and Gubana [5] developed another ''Pilodyn type'', a so-called blow count type apparatus.…”

Section: Assessment Techniquesmentioning

confidence: 99%

“…5 the results of parallel to the grain tests are shown, taken from small round specimen drilled from piles [4]. The age of the piles varied between 70 years and 640 years.…”

Section: Comparison With Strength Data From Literaturementioning

confidence: 99%

Service life modelling of timber structures

Kuilen

2006

Mater Struct

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The service life of structures depends on many factors including the current status of the structures and the age, as well as the expected future use. In order to be able to make decisions on possible interventions, an overview is given of a number of methods available to determine the current state of a structure. Data taken from existing structures (foundations) with and without biological decay as well as literature have been analysed. It has been used to extent an existing damage model for timber structures that takes the load history into account into a model that allows for service life calculations on partly deteriorated structures. This comprises structures or structural elements that suffer for instance from (biological) decay or from drying cracks as is often found in foundations and historic timber structures.

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“…Nondestructive testing (NDT) methods (needle and drill penetration resistance, screw and nail withdrawal resistance and core drilling) are mainly used to estimate density in standing trees and logs (Rinn et al 1996;Ponneth et al 2014;da Silva et al 2017), and in structural timber ( Görlacher 1987;Bobadilla et al 2007;Esteban et al 2009;Íñiguez-González et al 2015a;Llana et al 2018). Hardness has a good relationship to density (Ceccotti and Togni 1996).…”

Section: Introductionmentioning

confidence: 99%

In-situ density estimation by four nondestructive techniques on Norway spruce from built-in wood structures

et al. 2018

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Needle penetration resistance (NPR), screw withdrawal resistance (SWR), core drilling (CD) and drilling chips extraction (DCE) are nondestructive and semi-destructive techniques used to estimate density in timber structures. In most of the previous studies, these techniques were tested in clear sawn timber and clear specimens. The goal of the present paper is to study the relationship between density and these techniques by means of five different devices in whole pieces of timber from built-in engineering structures, which are from 12 4.5-m long structural timber joists of Norway spruce from a 19thcentury building in Barcelona (Catalonia, Spain). Although determination coefficients (R2) for density estimation models were lower than those from clear timber, the results obtained confirmed that these four techniques are suitable forin-situdensity estimation of woods in buildings. The best results were obtained by CD (the bigger the bit, the higher the correlation), followed by DCE, and SWR. The worst correlation was found for NPR devices, but the results could be probably improved with more measurements.

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Zerstörungsfreie Prüfung von Holz: Ein „in situ”-Verfahren zur Bestimmung der Rohdichte

Cited by 35 publications

References 3 publications

Structural analysis of two King-post timber trusses: Non-destructive evaluation and load-carrying tests

Structural analysis of two King-post timber trusses: Non-destructive evaluation and load-carrying tests

Service life modelling of timber structures

In-situ density estimation by four nondestructive techniques on Norway spruce from built-in wood structures

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