Acetylated Beech in Structural Timber Constructions

in Research Culture in Architecture

Abstract -

Beechwood is one of the strongest timbers there is, but its outdoor application in engineering structures is limited due to its distinct swelling and shrinking behavior as well as the low natural durability. Acetylation is a process that can drastically improve this behavior, but it also changes the mechanical properties of the wood. A variety of test series has been carried out to capture all positive and negative changes that come along with acetylation. One major aspect was to find suitable adhesives to produce glued laminated timber and laminated veneer lumber. Additionally, a tangible application of acetylated beech was examined by developing a wood concrete composite footbridge with minimal consumption of material. All relevant strengths and stiffnesses were determined to facilitate a complete FEM simulation of the structure. In that regard, a detachable connection to transmit shear forces between the timber and concrete cross sections was developed as well.

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