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Mechanické chování lepeného dřevěného nosníku
Špavor, Oskar
Wood buildings are gaining more and more customers over time. This popularity is mainly caused to fast construction, sandwich structure and a favorable microclimate. The brick systems as well as wood buildings we have a choice of a wide range of building systems. These systems combine often wood with other materials to improve the wood properties. One possibility is the combination with agglomerated materials. The aim of the bachelor thesis was experimentally described the mechanical behavior of the glued wooden I-beam under the loading, which is use in the construction as the main supporting element. The global and local elastic moduli (MOEglobal and MOElocal) and the flexural strength (MOR) of two types I-beams were determined. Two sets of samples with length 3000 mm and 1500 mm and with height 260 mm were produced. Each test series consisted of 10 samples. The lower and upper flanges were made from KVH prism of Norway spruce (Picea abies L. Karst.) with dimension 60 × 60 mm cross-section and middle beams were made from OSB boards with 15 mm thickness. The I-beam members were glued using polyurethane glue and were conditioned at T = 20° with relative humidity 65%. The testing was performed by 4-point bending test according to standard ČSN EN 408 + A1 (2012). The mean MOElocal for samples with length 3000 and 1500 mm were 5 GPa and 5.25 GPa, respectively. The mean MOEglobal with length3000 and 1500 mm were 12,3 GPa and 4,5 GPa, respectively. The mean MOR with length 3000 and 1500 mm were 10,3 MPa and 14,7 MPa, respectively.
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