FE analysis of CLT panel subjected to torsion and verified by DIC
Tóm tắt
The goal of this study was to analyze behavior of the cross-laminated timber (CLT) panel subjected to torsion and develop an efficient procedure for quick verification of numerical model of CLT that subsequently may be used for virtual prototyping of non-standard CLT products. Study used both experiments based on optical measurement using digital image correlation (DIC) and numerical modeling by means of finite element method (FEM). A physical torsion test of the CLT panel was first analyzed in terms of a displacement field that was computed on its surface. The FE simulation of the torsion test followed real boundary conditions and was carried out with use of 2 geometrically different FE models of the CLT. The first FE model did not take into account edge-bonding of the lamellas, the second one demonstrated alternative manufacturing option by considering the lamellas’ edge-bonding. The experiment and FE simulations were mutually compared based on displacement paths created on the panel surface. Results showed that the presented procedure offers relatively easy way of verification of FE analyses of CLT. FE model with edge-bonding of lamellas exhibited higher stiffness and higher relative error to DIC measurement than FE model without edge-bonding. Edge-bonding of lamellas introduces influential factor in FE modeling of CLT and should be omitted for accurate and realistic FE analyses of their behavior. Study also showed that lack of orthotropic properties of Oregon hybrid poplar can be in FEA sufficiently substituted by using cottonwood properties. Combining the DIC measurement and FEM in the analysis of the CLT is favorable since it offers an full-field validation of numerical models, which can be subsequently used for virtual prototyping.
Tài liệu tham khảo
ANSI/APA (2012) ANSI/APA PRG 320-2012 standard for performance-rated cross-laminated timber. APA The Engineered Wood Association, Tacoma, p 23
ASTM Standard D3044-94 (Reapproved 2000) Standard test method for shear modulus of wood-based structural panels. American Society for Testing and Materials
Bodig J, Jayne BA (1993) Mechanics of wood and wood composites. Krieger, Malabar
Czaderski C, Steiger R, Howald M, Olia S, Gülzow A, Niemz P (2007) Tests and calculations on 3-layered cross-laminated solid wood panels supported at all edges. Holz Roh Werkst 65(5):383–402
Dietsch P, Mestek P, Winter S (2012) Analytischer Ansatz zur Erfassung von Tragfähigkeitssteigerungen infolge von Schubverstärkungen in Bauteilen aus Brettschichtholz und Brettsperrholz. Bautechnik 89(6):402–414
Dujič B, Yates M, Linegar M (2008) An 8-storey residential building in London made from cross laminated solid timber panels. In: 19th international scientific conference on wood is good—properties, technology, valorization, application, Croatia, 17 Oct 2008
Gereke T, Niemz P (2010) Moisture-induced stresses in spruce cross-laminates. Eng Struct 32(2):600–606
Gülzow A, Gsell D, Steiger R (2008) Non-destructive evaluation of elastic parameters of square-shaped cross-laminated solid wood panels, built up symmetrically with 3 layers. Holz Roh Werkst 66(1):19–37
Mackerle J (2005) Finite element analyses in wood research: a bibliography. Wood Sci Technol 39(7):579–600
Mestek P, Kreuzinger H, Winter S, Design of Cross Laminated Timber (CLT) (2008) 10th world conference on timber engineering. Proceedings of a meeting held 2–5 June 2008, Miyazaki, Japan pp 156–163. ISBN 9781615670888
Mestek P (2011) Punktgestützte Flächentragwerke aus Brettsperrholz (BSP): Schubbemessung unter Berücksichtigung von Schubverstärkungen. Dissertation, TU München, pp 236
Muszyński L, Launey ME (2010) Advanced imaging techniques in wood-based panels research. In: wood-based panels: an introduction for specialists. State-of-the-art in wood-based panels research. COST Action E49:177–201
Sharpe WN (2008) Springer handbook of experimental solid mechanics. Springer, New York
Steiger R, Gulzow A, Gsell D (2008) Non-destructive evaluation of elastic material properties of cross-laminated timber (CLT). Conference COST E53, 29–30 Oct, Delft, Netherlands
Stürzenbecher R, Hofstetter K, Eberhardsteiner J (2010) Structural design of cross laminated timber (CLT) by advanced plate theories. Compos Sci Technol 70:1368–1379
Sutton MA, Orteu JJ, Schreier HW (2009) Digital image correlation for shape and deformation measurements basic concepts, theory and applications. Springer, Heidelberg, p 342
Thiel A, Schickhofer G (2010). CLT designer: the software tool for designing cross laminated timber elements: 1D-plate-design. World conference on timber engineering, Italy
Wood-Handbook (2010) Wood as an engineering material, Centennial edition. USDA Forest Service—FPL, Madison