Biege-, Zug- und Druckversuche an Schweizer Fichtenholz

Steiger, René

doi:10.1007/978-3-0348-5732-1

Cited by 7 publications

(5 citation statements)

References 9 publications

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“…Dabei sind nur die jeweiligen Schnittgrößen des Grenzzustands auszuwechseln. Unter Ansatz eigenformaffiner Imperfektionsfiguren ist die Imperfektionsgröße v 0 für BK und BDK gleich (wobei beim BDK ϑ 0 mit v 0 über R gekoppelt ist). Obwohl lineare Querschnittsinteraktionen verwendet worden sind, kann das ggf. zu höheren Biegewiderständen führende nichtlineare Werkstoffverhalten (Plastizität) durch die Wahl von kleineren Imperfektionen, jedoch wiederum gleich für BK und BDK, berücksichtigt werden [16]. Neben dem Vergleich der EC5‐BK‐Kurven [1, 2] mit Gl.…”

Section: Konsistente Reduktionskurven Für Biegeknicken (Bk) Und Biege...unclassified

Ein mechanisch konsistenter Ansatz für den Stabilitätsnachweis für Holzträger unter Druck und Biegung um die starke Achse, Teil 1 – Herleitungen

2023

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Die moderne Holzindustrie ist heute in der Lage, ausge sprochen schlanke Querschnitte in hoher Qualität, z. B. in Brettschichtholz, für weitgespannte Tragwerke herzu stellen. Dies erlaubt eine effektive Nutzung des Rohstoffs Holz. Auch aus architektonischer Sicht sind Brettschicht holzträger wegen ihrer geometrischen Variabilität beson ders attraktiv. Für die Zukunft ist auch aus Gründen der Ressourcenschonung ein vermehrter Einsatz weitge spannter, schlanker Holzkonstruktionen zu erwarten. Damit werden Stabilitätsnachweise für die Bemessung an Bedeutung gewinnen. Dies gibt Anlass, die derzeitigen Knickbeiwerte für Biegeknicken (BK) und Biegedrillkni cken (BDK) im Vergleich zu einem in diesem Aufsatz be schriebenen alternativen Ansatz näher zu beleuchten.

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Section: Konsistente Reduktionskurven Für Biegeknicken (Bk) Und Biege...unclassified

Ein mechanisch konsistenter Ansatz für den Stabilitätsnachweis für Holzträger unter Druck und Biegung um die starke Achse, Teil 1 – Herleitungen

2023

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“…In addition, there is a high degree of scatter in terms of material behavior and measurable values both within a wood species and within a single trunk. [5]. Each tree has its own history due to its location and the climatic conditions prevailing there, which has an influence on the structure of the tree [6].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Material Properties of Spruce Wood Samples to Improve the Development Process for More Sustainable Sawing Processes

Schmidt

Schreiner

Thorenz

et al. 2023

Lecture Notes in Mechanical Engineering

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The processing of wood as a renewable and sustainable material is steadily gaining in importance. However, sawing processes in sawmills are characterized by high electrical energy consumption. Improving the geometry of the saw teeth is an option to make sawing processes more energy efficient and sustainable. Since the industrial sawing processes in sawmills are rather inflexible, the development of new saw tooth geometries takes place in smaller experimental setups. However, the inhomogeneous and anisotropic properties of wood make it difficult to compare different material samples and saw teeth on the basis of measured values. This leads to untapped potentials regarding energy efficiency and sustainability in industrial sawing processes. This paper discusses material properties of spruce wood samples, depending on their place of extraction from the tree trunk. The measured variables considered are the wood moisture content, strength properties and the cutting force occurring during the sawing process. The results show that the measured values vary to different degrees within a tree trunk and between different tree trunks. Based on the results the validity of comparison measurements in the tool development process can be improved and thus increase the efficiency and sustainability of industrial sawing processes.

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“…The bending strength has a strong impact on the design of wooden structures, and it is often determined during nondestructive tests (NDT) with the simultaneous determination of the modulus of elasticity [ 9 , 30 , 31 ]. Currently, NDT based on ultrasound are one of the most popular methods of various material investigations, and they are used both in scientific research and in various industry branches [ 32 , 33 , 34 , 35 , 36 , 37 , 38 ]. The possibility of qualitative (strength) classification of wood based on the propagation speed of ultrasonic and elasticity vibration waves results from the fact that the investigated values depend on the moisture content (MC), the occurrence of defects, species, and the direction of propagation that define its mechanical properties [ 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 ].…”

Section: Introductionmentioning

confidence: 99%

The Strength of Pine (Pinus sylvestris L.) Sawn Timber in Correlation with Selected Wood Defects

et al. 2022

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Pine timber of Polish origin intended for structural purposes is characterized by significant variability in the quality parameters. Technological suitability determined on the basis of relevant international classifications is based on the assessment of both selected mechanical and physical properties of wood. Moreover, the description of visual properties is also a valuable indicator regarding defect distribution. In the group of quality features playing a crucial role in the classification of sawn timber, there are knots, disruptions of grains, cracks, etc. Thus, the aim of the research was to determine the correlation between the presence of selected defects and the strength properties of individual timber pieces. This type of study is based on a nondestructive test method that allows for high optimization of sawn materials processing. In the case of sawn timber of Polish origin, the modulus of elasticity (MOE) determined using the sonic test is commonly used as a criterion. The research material was harvested from southern Poland. The results of the conducted studies confirmed a correlation between an increasing occurrence of particular types of defects and the results of MOE. Furthermore, as a result of the performed investigations, no significant effect of narrow surface cracks on strength properties was observed.

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Biege-, Zug- und Druckversuche an Schweizer Fichtenholz

Cited by 7 publications

References 9 publications

Ein mechanisch konsistenter Ansatz für den Stabilitätsnachweis für Holzträger unter Druck und Biegung um die starke Achse, Teil 1 – Herleitungen

Ein mechanisch konsistenter Ansatz für den Stabilitätsnachweis für Holzträger unter Druck und Biegung um die starke Achse, Teil 1 – Herleitungen

Evaluation of Material Properties of Spruce Wood Samples to Improve the Development Process for More Sustainable Sawing Processes

The Strength of Pine (Pinus sylvestris L.) Sawn Timber in Correlation with Selected Wood Defects

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