Caractérisation du Chêne sessile et pédonculé de France en vue de son utilisation en structure

Lanvin, Jean-Denis; Reuling, Didier

doi:10.4267/2042/47474

Cited by 3 publications

(2 citation statements)

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“…Fig. 7 Tree slenderness and timber properties for French oak sawn wood [27] Values in the bracket are the maximum values (1 in relative value) Relative value is the value divided by the maximum Beams equivalent to Middle ages choice are the lowest diameter DBH: diameter of the standing tree at breast height…”

Section: Tree Choicementioning

confidence: 99%

Oak beams in medieval frameworks: Constraints and advantages for restoration

Thibaut

Caré

Maurin

2024

Journal of Cultural Heritage

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Section: Tree Choicementioning

confidence: 99%

Oak beams in medieval frameworks: Constraints and advantages for restoration

Thibaut

Caré

Maurin

2024

Journal of Cultural Heritage

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“…To be used as structural member, sawn timber must be graded to guarantee its mechanical characteristics in accordance with the European standard EN 14081-1 (2016). While this standard allows the strength grading of oak sawn timber, the technique typically used -visual grading by operators -is insufficient in producing viable material yields (Lanvin and Reuling 2012). As such, it remains a significant cause of material yield loss for oak timber.…”

Section: Introductionmentioning

confidence: 99%

11th Hardwood Conference Proceedings

2024

Hardwood Conference Proceedings

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Black locust (Robinia pseudoacacia L.) is the most widespread non-native tree species in Europe and has had a significant impact on the Central European landscape and forestry. The black locust has many exceptional characteristics that represent considerable potential for use by man. The climate shift in recent decades in Central Europe could further strengthen the importance of this tree species. However, there are also risks arising from the invasiveness of the black locust. Like Hungary, Czechia has had many years of experience with this tree species. Still, the current approach between these two countries, particularly in conventional forestry, differs. This paper attempts to summarise how the management of Robinia and its stands is viewed in Czechia, where the common forestry utilization of black locust is currently not considered due to its invasiveness. The reason for a more reserved forestry attitude in Czechia can be associated with the relatively frequent stem deformities of Robinia stands, which are often attributed to frost. However, the frost deformities and low stem-form quality of some Robinia stands do not affect their vigour and potential to invade adjacent habitats. It often takes considerable effort to remove black locust, especially where the spreading of Robinia threatens valuable adjacent ecosystems. On the other hand, there is great potential for the use of Robinia in Czechia. It can be found in controlled energy crops, fast-growing plantations (lignicultures), some land reclamation projects or urban greenery. Robinia can also be grown in small stands or in groups of trees surrounded by arable land that does not allow the tree to spontaneously spread. Regarding the production plantations of Robinia, the Hungarian experience and breeding program can be very inspiring for Czechia. Generally, there is a move towards 'site-specific management', but with a strong emphasis on the precautionary principle. Finding and then consistently applying a balanced approach to black locust management that not only allows for the potential but also respects the risks of Robiniait is currently a key challenge for Czech forestry, landscape and nature conservation.

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Variation and serial correlation of modulus of elasticity between and within European oak boards (Quercus robur and Q. petraea)

Tapia

Aicher

2019

Holzforschung

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This research aimed at describing the tensile modulus of elasticity (MOE), density and knot variability between and within oak (Quercus robur, Q. petraea) boards, which is essential for the stochastic modeling of wooden composites, such as glulam. Longitudinal deformations for 100-mm long cells were measured. The local density variation along boards revealed a very low mean coefficient of variation (COV) of 3%. The global MOE was precisely predicted from local (cell) MOEs, which span from 2.6 to 22 GPa. The mean COV of local MOE along board length was 12%, with extremes of 3% and 28%. The cell-related relationships of MOE with either density or knot area ratio showed low R-values of 0.4 and 0.3, respectively. A multivariate linear regression with both variables increased the MOE prediction to R = 0.6, which is below the literature results for beech and spruce wood. A serial correlation analysis of the local MOE was performed for board segments quasi-free of knots and for all cells, investigating different normalization approaches. Applying no MOE normalization delivered too high correlations due to pronounced inter-board MOE variations. A normalization based on an averaged maximum MOE per board delivered reasonable serial correlation results for the first four lags of the MOE knot-free variation (0.61; 0.38; 0.19 and 0.08). Considering also the knot-affected cells reduced the serial correlation roughly by a factor of 2.

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Caractérisation du Chêne sessile et pédonculé de France en vue de son utilisation en structure

Cited by 3 publications

References 0 publications

Oak beams in medieval frameworks: Constraints and advantages for restoration

Oak beams in medieval frameworks: Constraints and advantages for restoration

11th Hardwood Conference Proceedings

Variation and serial correlation of modulus of elasticity between and within European oak boards (Quercus robur and Q. petraea)

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