Efecto de las gemas en la resistencia a flexión de piezas enterizas de madera

Martitegui, Francisco Arriaga; Herrero, Miguel Esteban; Álvarez, R. Argüelles; Maldonado, Ignacio Bobadilla; González, Guillermo Íñiguez

doi:10.3989/mc.2007.v57.i288.65

Cited by 11 publications

(5 citation statements)

References 2 publications

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“…As expected, high values were observed in bending strengths. Previous studies [3] [4] with comparable wood species confirm this. The UT spruces presented above-average values of bending strength, and the sample from Austria showed the 5-percentile value of 47.7 N/mm 2 with respect to its effective cross section.…”

Section: Bending Strengthsupporting

confidence: 80%

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Modulus of Elasticity and Bending Strength of Squared Timber with Wane of Spruce and Larch

Schrentewein¹

2013

AMR

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Historical wooden structures are made of round timber or frequently of squared timber with wane, in southern European countries also known as Uso Fiume and Uso Trieste. Knowledge of the mechanical properties of these load-bearing structures is very important in their assessment and maintenance. In two research projects undertaken in cooperation with IVALSA/CNR, TIS Techno Innovation South Tyrol, Microtec and Lignaconsult, more than 750 spruce and larch beams were subjected to bending fracture tests to determine their mechanical properties. Using existing datasets, a method was developed to determine the modulus of elasticity of an irregular cross section which varies along the length of the beam. If the effective cross-section geometry of a wooden structure made from squared timber with wane is known, the elasticity behaviour and the load-bearing capacity can be defined using the calculated mechanical properties.

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Section: Bending Strengthsupporting

confidence: 80%

“…al. [3] and Vestol/Hoibo [4] make detailed reference to the cross section geometry of the beam. Martitegui et.…”

Section: Introductionmentioning

confidence: 99%

Modulus of Elasticity and Bending Strength of Squared Timber with Wane of Spruce and Larch

Schrentewein¹

2013

AMR

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“…-Interrupting the grain continuity [24,25]; -Cutting the fiber around the knots and increasing the stress in their proximity [26]; -Interactions between shrinkage fissures and groove depth [19].…”

Section: Moe Reductionmentioning

confidence: 99%

Strengthening of Ancient Timber Beams during Restoration Operations: Effect of Wood Cutting on Modulus of Elasticity

Cavalli,

Mazzanti,

Riparbelli

et al. 2023

Forests

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In ancient buildings, timber members may require specific on-site interventions, including reinforcement or repair and sometimes the insertion of reinforcing material into grooves routed in the original sound wood. The required number, positions, and dimensions of grooves and the strengthening materials may differ according to the desired increases in bending stiffness and strength. The modulus of elasticity (MOE) of each beam is of key importance: the MOE is typically a point of weakness for wood and is considered a constant characteristic of each beam. However, taking into account the wood lost for the groove, whether the needed incisions affect the stiffness is unknown. As such, in this study, 12 old beams were accurately measured, and their static and dynamic MOEs were calculated before and after groove formation to simulate the typical processes of reinforcing interventions. One groove was routed along the length of each beam and progressively deepened in three steps. The results of tests showed how the MOE is affected by the groove depth, decreasing by up to one-third (34.1%), and that beam stiffness cannot be regarded as constant. Beam stiffness depends on the features of the beam, mainly the pith, fissures, and slope of the grain, as well as its structural integrity. Beam stiffness is strongly influenced by the cuts upon it. This study proves how the weakening effect of grooves created on-site can be assessed using the dynamic MOE and roughly predicted with a visual survey. The grooves required for strengthening beams must be thoroughly evaluated, considering the potential reduction in the mechanical properties of the beam, which goes well beyond the wood lost during cutting.

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“…-interrupting the grain continuity [25,26], -cutting the fiber around the knots and increasing the stress in their proximity [27], -interaction between shrinkage fissures and grooves depth [20].…”

Section: Moe Reductionmentioning

confidence: 99%

Strengthening of Ancient Timber Beams in Restoration Operation: Effect of Wood Cutting on MOE

Cavalli¹,

Mazzanti²,

Riparbelli³

et al. 2023

Preprint

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In ancient buildings, timber members could need specific on-site interventions, including reinforcement or repair, sometimes inserting of reinforcing material into grooves routed in the original sound wood. Grooves number, positions and dimensions, and strengthening materials may differ, according to the desired increase of bending stiffness and strength. The Modulus-of-Elasticity (MOE) of each beam is of key importance, but the incisions can affect it, net of the reduction of the removed wood. In this study 12 old beams were accurately measured and their static and dynamic MOEs calculated before and after the grooves processing, to simulate the operations of typical reinforcing interventions. One groove was routed along the length of each beam and deepened progressively by three steps. Tests have showed how the MOE is affected by the groove depth, decreasing up to one third. The paper proves how the weakening effect of grooves on-site can be assessed with dynamic MOE and roughly predicted by means of visual survey. Grooves need for strengthening beams, must be carefully evaluated because of the variation of the actual mechanical properties, net to lost wood.

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Efecto de las gemas en la resistencia a flexión de piezas enterizas de madera

Cited by 11 publications

References 2 publications

Modulus of Elasticity and Bending Strength of Squared Timber with Wane of Spruce and Larch

Modulus of Elasticity and Bending Strength of Squared Timber with Wane of Spruce and Larch

Strengthening of Ancient Timber Beams during Restoration Operations: Effect of Wood Cutting on Modulus of Elasticity

Strengthening of Ancient Timber Beams in Restoration Operation: Effect of Wood Cutting on MOE

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