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UNSTEADY STATE THERMAL ANALYSIS OF GLULAMINATED TIMBER ELEMENTS SUBJECTED TO FIRE
Abstract
The paper presents the procedures of introducing the unsteady state numerical analysis domain for simulating the mechanical behavior of glue laminated timber (glulam) elements when subjected to high temperatures. For any analysis applied to characterize the fire resistance of wood, glue laminated timber implicitly, the unsteady state numerical analysis domain must be applied, considering the heat propagation, humidity percentage loss and the overall change of the mechanical characteristics of the components through a phenomenon that can be simulated as phase transformation. Behavior of glued laminated timber when subjected to fire is equally influenced by the behavior of adhesives in the cross section composition together with the wood lamellas. Even the focus of fire resistance analysis was on the characteristics and properties of wood, the type of adhesive is of great importance also. The current adhesives used, like phenolic or aminoplastic offer good mechanical properties and satisfactory results in terms of strength, durability or fire resistance, for which provisions and details are already included in standards. The paper studies the delamination when structural element is subjected to high temperatures with discussion if localized effects relate to sectional behavior. This paper is based on the background offered by a research project aiming to develop a testing system for the mechanical behavior of some new configurations of glulam composite materials (comprising different wood essences and adhesives) when subjected to high temperatures. The need for this type of analysis is becoming more topical due to the trend of replacing with bio-renewable materials (wood) structural elements from materials whose production is energy-intensive (especially steel and cement) within the framework of the European policy "Green New Deal" to reduce greenhouse gas emissions, of which the construction industry is responsible for approximately 40-50%.
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References3
D. E. Kretschmann, "Mechanical Properties of Wood," in Wood Handbook Wood as an Engineering Material, U.S. Department of Agriculture, Forest Service, Forest Products Laboratory, 2010, pp. 100-145.
A. Bernaczyk, A. Wagenfuhr, C. Terfloth, T. Krystofiak, J. Lincke and P. Niemz, "Investigations into the Influence of Temperature on the Tensile Shear Strength of Various Adhesives," Materials, vol. 16, no. 18, 2023. DOI: 10.3390/ma16186173
M. a. P. D. Blagojevic, "A new curve for temperature-time relationship in compartment fire," Thermal Science, vol. 15, pp. 339-352, 2011. DOI: 10.2298/tsci100927021b
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