Bauen mit massiven Brettsperrholzelementen (BSP‐Elementen) gewann in den letzten Jahren an Bedeutung. Beginnend mit dem Einfamilienhausbau vor mehr als 15 Jahren wurden und werden mittlerweile immer größere Bauaufgaben angedacht und realisiert. Als Beispiele der aktuell größten Bauwerke in der Holz‐Massivbauweise können der Murray Grove Tower und das Bridboard House – 2008 bzw. 2010 in London errichtet – angeführt werden. Die jeweils achtgeschossigen Bauwerke wurden komplett mit dem noch “jungen” Baustoff Brettsperrholz (BSP) realisiert.Traditionell erfolgt die Berechnung von Deckenelementen aus BSP als einachsig gespannter Plattenstreifen. Damit kann allerdings nur die Haupttragrichtung der orthotrop wirkenden BSP‐Platte erfasst werden. Um auch die Nebentragrichtung für die Bemessung zu nutzen, werden im vorliegenden Beitrag sämtliche Steifigkeitskennwerte von BSP‐Platten erläutert. Damit können auch Sonderfälle wie Deckenaussparungen oder punktgestützte Platten, welche eine 2D‐Plattenberechnung nach der orthotropen, schubnachgiebigen Plattentheorie (REISSNER‐MINDLIN) erfordern, untersucht werden.Two‐axial load transfer of Cross‐Laminated‐Timber platesIn the last years building activity with solid Cross Laminated Timber (CLT) elements gained remarkable relevance. Starting with single family houses over 15 years ago medium and large sized building construction jobs are analysed and solved in the meantime. Two examples for large multi‐storey houses with eight floors each, erected completely with CLT, can be cited here: on the one hand the Murray Grove Tower (2008) and on the other hand the Bridboard House (2010) – both realized in London. Structural design of these CLT‐plates is performed traditionally as simply supported uniaxial plate. Only the stronger, more important main direction of CLT‐plates, which is defined as the orientation of the outer layers, is treated by this assumption. In order to include the minor important orthogonal direction of CLT in a two dimensional plate theory all plate stiffness coefficients of CLT‐plates are illustrated and discussed in the present paper. Consequently special cases as large cutouts in CLT‐plates and column supported CLT‐plates can be treated with the well known REISSNER‐MINDLIN plate theory, which includes deformation due to bending and shear.
Historic roof structures made of timber in Graz -methodology for site evaluationThis contribution deals with the influences of time and those relevant to bearing capacity on the reliability of historic timber roof structures. Furthermore the evaluation as well as damage analysis of historic roof structures are discussed. Based on this an easily comprehensible and documentable methodology temporarily only for roof structures in the area of Graz is presented and illustrated with examples.
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