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Author(s):	Flaig, Marcus
Title:
Abstract:	Bei der Bemessung von in Plattenebene beanspruchten Brettsperrholzträgern müssen Schubspannungen in den Brettlamellen und in den Kreuzungsflächen zwischen rechtwinklig miteinander verklebten Längs- und Querlagen berücksichtigt werden. Insgesamt werden dabei drei Versagensmechanismen unterschieden. Für den Nachweis der Tragfähigkeit müssen die Schubspannungen im Brutto- und im Nettoquerschnitt und in den Kreuzungsflächen berechnet und mit entsprechenden Festigkeiten verglichen werden. Zur Berechnung der Schubspannungen in Abhängigkeit des Trägeraufbaus werden analytische Lösungen vorgestellt und es wird eine vom Trägeraufbau abhängige effektive Schubfestigkeit unter Berücksichtigung der verschiedenen Versagensmechanismen angegeben. Zur Berechnung der Schubverformungen wird ein effektiver Schubmodul in Abhängigkeit des Trägeraufbaus vorgestellt, der Verformungsanteile in den Brettlamellen und in den Kreuzungsflächen berücksichtigt. CLT-beams loaded in-plane direction - Part 1: Effective strength and stiffness properties for the shear design In the design of CLT-beams loaded in-plane, shear stresses in the lamellae and in the crossing areas between orthogonally bonded boards of longitudinal and transversal layers need to be considered. A total of three different failure modes can be distinguished. For the design in the ultimate limit states, shear stresses in the gross and in the net cross section and shear stresses in the crossing areas need to be calculated and compared to respective strength properties. Analytical solutions for the calculation of shear stresses, taking into account the board width and the layup of CLT-beams, are presented. The effective shear strength of CLT-beams loaded in-plane is derived from the load carrying capacities of the different failure modes. For the calculation of the shear deformation an effective shear modulus is specified in dependence of the cross-sectional structure taking into account shear strain in the lamellae and in the crossing areas.
Source:	Bautechnik 92 (2015), No. 11
Page/s:	741-749
Language of Publication:	German

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