Advances for the on-site determination of the stresses state in timber structures in service

Antonio, Maite Crespo de; Luengas-Carreño, D.; Beitia, Santiago Sánchez

doi:10.2495/str150641

Cited by 1 publication

(5 citation statements)

References 13 publications

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“…The values of the two Young's elastic moduli for this material and its structural size were measured in 20 blocks (20 cm × 20 cm × 15 cm). They were tested under compression stresses within the elastic zone, obtaining the following average values [7]:…”

Section: Laboratory Resultsmentioning

confidence: 99%

“…Hole-drilling method is considered an SDT, due to the necessity of making a small hole on the surface of the element to relieve stresses and measure strains originated around it. This method has been applied on wood for the first time by the authors, obtaining successful results [7]. Although the application shown here is new, hole drilling is a well-known method.…”

Section: Introductionmentioning

confidence: 81%

“…The objective of this research was the adaptation of the hole-drilling technique to be applied in timber structures. The first part of the research, presented in STREMAH 2015 [7], allowed results to be obtained for the moduli of elasticity and the compliance matrix for radiate pine structural elements. Both data allow a definition of the elastic behaviour of this type of wood.…”

Section: Discussionmentioning

confidence: 99%

“…Some compression tests were done in order to validate the application of the hole-drilling method on wooden structural elements as was shown in STREMAH 2015 [7]. According to the recommendations of the standard, but also to the available boring tool (18 mm) and commercial strain gauges size (10 mm in length) ( Fig.…”

Section: Adaptation Of the Hole-drilling Techniquementioning

confidence: 99%

“…On the left, the device disposal scheme, measured in millimetres. On the right, a real sample with its rosette located avoiding a crack.compliance took the following value for Pinus radiata D. Don elements under compression load (2)[7]:…”

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confidence: 99%

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Application of the hole-drilling method for measuring stress in timber structural elements subjected to compression perpendicular to the fibres

Antonio¹,

Luengas-Carreño²,

Beitia³

2017

Int. J. HA

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The hole-drilling method should be included among semi-destructive techniques (SDTs) in the in situ structural assessment. Many useful techniques are used in heritage for material assessment to measure density, stiffness or deterioration level in different materials, but there was not a technique used strictly for the structural analysis or for measuring stresses. Hole drilling is considered an SDT because drilling is needed to remove a part of the material in order to relax the existing stress. The relaxed strains are inferred due to the extraction of the material by drilling a hole of 18 mm in diameter and 16 mm in depth. The damage caused by that hole is minor and it does not affect the integrity of the supporting element nor its load-bearing capacity. Traditionally, the method was based on the ASTM E837 standard, only referred to residual stress in isotropic materials. These researchers have adapted the method for this natural orthotropic material: wood. Hole drilling has been adapted for a new material, a new application and a new scale. The importance of this new application lies in the possibility of measuring the current stress status derived from structural loads and other constructive actions in an existent building. This paper focuses on the measurement of a special situation in wood: compression perpendicular to the grain. The load-bearing strength of wood is very high in the fibre direction, but it decreases significantly in the perpendicular direction, causing large deformation due to the fibres being crushed. There is a specific piece supporting compression perpendicular to the grain whose Spanish name is 'zapata'. This structural element has been traditionally used in architecture. The tests in this paper were carried out at the laboratory, simulating the stress in 'zapatas' in real structures. The results obtained are the first approach to the application of the hole-drilling technique before applying it in real structures.

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Section: Laboratory Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 81%

Section: Discussionmentioning

confidence: 99%

Section: Adaptation Of the Hole-drilling Techniquementioning

confidence: 99%

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confidence: 99%

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