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1
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
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Technical simulation of knots in structural wood

100%
Burawska I., Zbiec M., Kalicinski J., Beer P.
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
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2013
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tom 82
2
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
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Ovality on trees adjacent to skid road

100%
Karaszewski Z., Giefing D. F., Lacka A., Noskowiak A.
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
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2014
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tom 86
3
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
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Strip road impact on selected wood defects of Norway spruce (Picea abies (L.) H. Karst)

100%
Bembenek M., Giefing D. F., Karaszewski Z., Lacka A., Mederski P. S.
Drewno. Prace Naukowe. Doniesienia. Komunikaty
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2013
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tom 56
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nr 190
Creating strip roads in second age class stands is an indispensible operation for carrying out thinning. It is especially important in places where there is an intention to do a first thinning using mechanised thinning operations. Felling trees to create strip roads results in altered conditions for the tree growth of neighbouring trees.In particular, this is due to an increase in exposure to sunlight. This can lead to changes in the growth of trees and consequently changes in the morphology of the trunk and the development of defects. The objective of this paper was to analyse the frequency of the presence of particular defects in the structure and shape of spruce ina five-year period after the creation of a strip road. The research was carried out in an artificially regenerated spruce stand within the spruce’s natural, northern habitat in Poland. A 34-year-old stand underwent a systematic thinning scheme which involved the removal of every eighth tree row. The analysis was carried out on trees growing both adjacent to the strip roads (which had a greater growing area around them and greater access to sunlight) as well as trees from further within the stand. Diameter growth was taken in three places: at breast height, in the middle of the trunk between breast height and the base of the crown, as well as at the base of the crown. The average incremental growth, pith eccentricity taper and ovality were calculated. No statistically significant difference in defects between the trees growing by the strip road and those growing further in the stand was observed. Greater taper on mid-tree logs in comparison to butt logs was observed. Insignificant changes in the morphology of the trunks, supports the validity of cutting strip roads in second age class stands.
4
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Comparative study of qualitative structure the beech logs sorted by European standard EN 1316-1 and Slovak standard STN 480065

84%
Racko V., Cunderlik I.
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
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2014
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tom 85
5
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
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Comparison of different failure approaches in knotty wood

84%
Guindos P.
Drewno. Prace Naukowe. Doniesienia. Komunikaty
|
2014
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tom 57
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nr 193
This article presents and assesses 64 different ways for predicting the failure onset in knotty wooden beams. The aim is to provide engineers and modellers a generalview of how to evaluate the failure in wooden structural members with knots.The studied criteria included both the conventional point-based and average stress theories. Special attention was paid to the effect of the elements of the woodmesostructure, i.e. knots and fiber deviation, which can generate singular stress concentrations as notches or cracks would do in fracture mechanics. The case study consisted of predicting the failure onset of bending in structural wooden beams.A previously validated finite element model was used in order to compute the heterogeneous stresses. It was found that the knots caused considerable stress singularities so that the size of the average stress theory influenced the failure predictions by up to 23%. However, the variations generated by distinct phenomenologicalcriteria were in general much smaller. The application of the average stress theory in large stress integration volumes is strongly recommended when predicting the failure in wood members.
6

Mecano VDA

84%
W K.
Biuletyn Informacyjny Ośrodka Badawczo-Rozwojowego Przemysłu Płyt Drewnopochodnych w Czarnej Wodzie
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1999
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tom 40
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nr 3
229
7
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Factors affecting the timber quality of black alder (Alnus glutinosa (L.) Gaertn.)

84%
Karaszewski Z., Mederski P. S., Bembenek M., Giefing D. F., Sawicka K., Gierszewska M.
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
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2015
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tom 89
8
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Effect of sawn zone on the quality of lumber in the evaluation of selected pine wood defects

84%
Wieruszewski M., Mirski R., Trocinski A., Kawalerczyk J.
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
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2021
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tom 114
9

The effect of some factors on the red heart formation in beech trees

84%
Racko V., Cunderlik I.
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
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2012
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tom 79
10
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Linear relations between defect frequency and volume of beech logs

67%
Karaszewski Z., Bembenek M., Mederski P. S., Szczepanska-Alvarez A., Giefing D. F., Wegiel A.
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
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2013
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tom 83
11
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
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The possibility to use a side-timber in glulam beams manufacturing for structural applications

67%
Kawalerczyk J., Kulinski M., Dziurka D., Mirski R.
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
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2021
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tom 113
12
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Investigation of round Scots pine wood WC01 class using X-ray computer tomography

67%
Zaton P., Kozakiewicz P., Mankowski P.
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
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2022
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tom 117
13

Mechanisms of load capacity and stability decline

67%
Burawska I.
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
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2012
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tom 77
Mechanisms of load capacity and stability decline. Article deals with failures of constructions with considerations of static work states. Analysis of bent beams and compressed columns was made, as most important elements of wooden structural works. Most common structural members failures causes were described, as design and manufacturing errors as well as local weakening caused by wood structural defects. Because of subject challenging, it is purposeful to take a detailed look into the problem, in aim to determine cracks propagation in dependence on type and placement of the defect.
14

Wysokość położenia sęków oraz lokalizacja i wielkość martwic u świerka pospolitego [Picea abies (L.) Karst.] pochodzącego z głównych ośrodków i zasięgów jego występowania w Polsce

59%
Michalec K.
Acta Agraria et Silvestria. Series Silvestris
|
2011
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tom 49
The research presented below analyses the differences in the location of knots and injuries as well as the size of injuries on the stems of Norway spruce from different regions of Poland. The research was conducted on 32 plots located within two ranges of the occurrence of spruce in Poland: the north-eastern range and the south-western one. On the selected spruce trees, the researchers measured the height of location of knots and injuries as well as injury sizes. The analyses revealed significant differences in: the height of location of knots and overgrown injuries and the size of injuries in trees from different regions and ranges of occurrence while no such differences were found in the height of location of open injuries.
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