PL EN. Widoczny [Schowaj] Abstrakt. Adres strony. Reliability of the thermal treated timber and wood-based materials in high temperatures.
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PL EN. Widoczny [Schowaj] Abstrakt. Adres strony. Reliability of the thermal treated timber and wood-based materials in high temperatures. Pieniak, D. Existing wood and wood-based materials have had several drawbacks limiting their use, which in consequence resulted in replacing them by other materials. The most significant problems were limitations regarding maximum dimensions of the components cross - section and capabilities of manufacturing of the large-scale components.
Durability and flammability of surfaces were the limiting factors as well. Nowadays, thermally treated wood and wood composites are more and more commonly used in the engineering constructions, such as: glued laminated timber GL , laminated veneer lumber LVL and thermally treated timber TT.
The timber undergoes a process of thermal degradation. In high temperatures timber structure is subject to simultaneous influence in the form of forces and thermal impacts. These factors influence stress distribution in the wood structure and limit its load capacity, reflecting structure decohesion. The aim of the presented studies was to determine impact of increased temperatures on strength of the wood materials and wood-based composites.
Additionally, based on the results of the strength studies, analysis of the probabilisty of survival in high temperatures was performed. Samples used in the static bending strength studies were made of the laminatem veneer lumber - LVL, glued laminated pine timber - GL, and thermally treated - TT and non-treated spruce timber - NTT.
The samples were in a cuboidal shape with dimensions of 20x20x mm. Based on the obtained results a reliability analysis was performed. For the analysis a two-parameter Weibull distribution was applied. In case of materials with laminated structure - LVL and GL, an increase in standard deviation of the results of bending strength in the successive temperature ranges has been observed. Opis fizyczny. Ogrodnik, P. Oszust, M. Niewczas, A.
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reliability of the thermal treated timber and wood-based materials in ...
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Methods to Assess Load Capacity of the Old Wooden Building Components
The reinforcement effect was achieved by combining, with the assistance of the gluing technique, of a CFRP type carbon composite with wooden elements of the beam. The obtained results were presented in the form of fields of combined states of stresses and deformations in individual beam elements. Calculations were performed on numerical models employing the finite elements method FEM. The best known of these materials with which considerable hopes are associated include carbon or glass fibres [2, 3, 8].
Abstract Wood maintains remarkable durability under optimum conditions. However, it erodes faster than other construction materials in the circumstances of average usage of civil structures. Therefore, built features made of wood, especially historical features and structures, require repairs and reinforcements more frequently than those made of other materials. Non-destructive testing is usually carried out in structures that are currently in use and is aimed at early detection of failures and taking appropriate remedial measures. It can be generally assumed that diagnostic testing of wood is a difficult process due to its structure. However, the ability to identify the current strength parameters of wooden structural components makes it possible to properly assess their suitability for further use and design appropriate reinforcement and reconstruction methods.