Cross laminated timber at in-plane beam loading – New analytical model predictions and relation to EC5 (CROSBI ID 668870)
Prilog sa skupa u zborniku | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Jeleč, Mario ; Danielsson, Henrik ; Serrano, Erik ; Rajčić, Vlatka
engleski
Cross laminated timber at in-plane beam loading – New analytical model predictions and relation to EC5
Cross laminated timber (CLT), being a versatile engineered timber product, has in recent years become well-known and of global interest. The orthogonal, laminar structure allows for application as full size elements for both out- of- plane and in-plane loading conditions. The work to be presented concerns in-plane loaded CLT beams, whose use is very relevant from a practical engineering point of view since the transversal layers have a reinforcing effect with respect to stress perpendicular to the beam axis. Due to the layered composition of CLT, the stress state is complex and several failure modes and geometry parameters need to be considered in design. In addition to the basic material strength parameters and gross cross section dimensions, the beam strength is furthermore affected by the ratio of the longitudinal and transversal layer widths and by the dimensions of the cross sections of the individual laminations. Several experimental tests on CLT beams have been conducted, e.g. by Bejtka (2011), Flaig (2013) and Danielsson et al (2017a, 2017b). An analytical composite beam model for stress analysis and strength verification has been presented by Flaig & Blass (2013), including stress based failure criteria for relevant failure modes. That model includes two basic assumptions related to the shear stresses acting in the crossing areas between the longitudinal and transversal laminations and relevant for shear failure mode III: 1) the stresses are, irrespective of the element lay-up, uniformly distributed in the beam width direction and 2) the torsional moments/stresses are uniformly distributed over all crossing areas in the beam height direction. Based on comparison to 3D FE- analyses as presented by Jelec et al (2016) and Danielsson et al (2017a), both these assumptions seem to be inaccurate. The aim of the paper is to present improvements of the model by Flaig & Blass (2013), regarding stress analysis and strength verification with respect to shear mode III failure of prismatic CLT beams. The improvements concern the magnitude and the distribution of the internal forces and torsional moments acting in the crossing areas between longitudinal and transversal laminations. Of specific interest is the non-uniform distributions in the beam width and height directions. The improved analytical model will be presented in exact and simplified forms and compared to the model as presented by Flaig & Blass. Internal force distributions according to the analytical models will also be compared to results of full 3D FE- analysis.
CLT, beam, in-plane loading, shear failure, lay-up, FE-analysis
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Podaci o prilogu
361-375.
2018.
objavljeno
Podaci o matičnoj publikaciji
International Network on Timber Engineering Research - INTER Proceedings
Gorlacher, Rainer
Karlsruhe: KIT Holzbau und Baukonstruktionen
2199-9740
Podaci o skupu
International Network on Timber Engineering Research (INTER)
predavanje
10.08.2018-13.08.2018
Talin, Estonija