Rastgele Alanlı Sonlu Elemanlar Analizi (RFEM) Kullanılarak Mafsallı Birleşimli Bir Ahşap Kafesin Güvenirliğe Dayalı Analizi
Abstract
Ahşap, mekanik özellikleri yüksek değişkenlik gösteren anizotrop bir yapısal malzemedir. Yapılarda kullanılan ahşap elemanlarda mekanik özellikler biyolojik köken, çevresel koşullar ve üretim sürecini içeren birçok etkene bağlıdır. Aynı ağaçtan elde edilen ahşap elemanlar dahi, boğumlar ve reçine kovukları gibi yerel kusurlardan ötürü mekanik özelliklerde değişkenlik eğilimindedir. Bu nedenle ahşap yapıların güvenirlik değerlendirmelerinde, ahşap elemanlardaki mekanik özellik değişkenliğinin göz önüne alınması gerekmektedir. Çalışmada, rastgele alanlı sonlu elemanlar yöntemi (RFEM) kullanılarak mafsallı birleşimli bir ahşap kafesin güvenirlik analizi yapılmıştır. Ahşap elemanların elastisite modulü rastgele alan olarak tanımlanmıştır. Kafes modeli ve analizler ANSYS sonlu elemanlar yazılımı ile gerçekleştirilmiştir. Ahşap elemanların mekanik özelliklerindeki değişimin kafes sistemindeki çökmelere etkisi kullanılarak sonuçlar sunulmuştur.
References
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Abstract
Wood is an anisotropic structural material with highly variable mechanical properties. The mechanical properties of wood used in timber structures depend on a number of factors including biological origins, environmental conditions and manufacturing processes. Even the timber members from the same tree are prone to variations in their mechanical properties due to the presence of local defects such as knots and resin pockets. Therefore, the reliability assessment of timber structures needs to take into account the variability of the mechanical properties of timber members. In this study, Random Field Element Method (RFEM) was used to carry out the reliability assessment of a pin connected timber roof truss. The modulus of elasticity and Poisson’s ratio were selected as the random field variables for the timber members. Modelling and analysis of the timber truss was conducted using the ANSYS finite element analysis software. The impact of the variation of the mechanical properties of the timber members on the deflections of the truss system used in this study are presented in the conclusions.
References
- Arwade, S. R., Winans, R., Clouston, P. L. (2010). Variability of Compressive Strength of Parallel Strand Lumber. Journal of Engineering Mechanics, 136(4), 405-412.
- Asdrubali, F., Ferracuti, B., Lombardi, L., Guattari, C., Evangelisti, L., Grazieschi, G. (2017). A review of structural, thermo-physical, acoustical, and environmental properties of wooden materials for building applications. Building and Environment, 14, 307-332.
- Blass, H. J., Aune, P., Choo, B. S., Gorlacher, R., Griffiths, D. R., Hilson, B. O., Racher, P., Steck, G. (1995). Timber engineering STEP2. Design-Details and structural systems. Almere, The Netherlands: The Centrum Hout.
- Forest Products Laboratory. (1999). Wood Handbook: Wood as an Engineering Material. USDA, Madison, Wisconsin.
- Larsen, H. J. & BYG (2001). Properties affecting reliability design of timber structures. COSTE24 Seminar on Reliability of timber structures, Coimbra, Portugal, May 4-5, 2001.
- Sun, X., He, M., Li, Z. (2020). Novel engineered wood and bamboo composites for structural applications: State-of-art of manufacturing technology and mechanical performance evaluation. Construction and Building Materials, 249, 1-23.
- Vanmarcke, E. (2010). Random fields: Analysis and synthesis. New Jersey, USA: World Scientific.
- Villar, J. R., Vidal, P., Fernandez, M S., Guaita, M. (2016). Genetic algorithm optimisation of heavy timber trusses with dowel joints according to Eurocode 5. Biosystems Engieering, 144, 115-132.
Details
| Primary Language | English |
|---|---|
| Subjects | Engineering |
| Journal Section | Articles |
| Authors | |
| Early Pub Date | July 29, 2021 |
| Publication Date | November 30, 2021 |
| Published in Issue | Year 2021 Issue: 27 |
