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Non-linear analysis of a stress-laminated-timber bridge loaded to failure

Kristoffer Ekholm (Institutionen för bygg- och miljöteknik, Konstruktionsteknik) ; Robert Kliger (Institutionen för bygg- och miljöteknik, Konstruktionsteknik) ; R. Crocetti
Proceedings of the Sixth International Conference on Bridge Maintenance, Safety and Management, IABMAS 2012, Stresa, Lake Maggiore, 8-12 July 2012 p. 1879-1886. (2012)
[Konferensbidrag, refereegranskat]

The general assumption in stress-laminated-timber (SLT) bridge design is that the structural response is linear both in the serviceability limit state (SLS) and in the ultimate limit state (ULS). However, this has been shown not to be the case according to a full-scale test performed in Sweden where the SLT deck was subjected to a failure load. When an SLT deck is loaded to failure, non-linear behaviour must be considered when a structure of this kind is analysed. Both horizontal and vertical slip occur in the interlaminar interface between the stressed glulam laminations. This behaviour does not occur in a solid timber plate. Once slip has occurred, the stresses are redistributed between the laminations. Interlaminar slip is of great importance and is affected by several factors such as the pre-stress level, surface roughness and surface moisture content. A rectangular SLT deck, 5.00 × 7.98 × 0.27 m 3 (length, width and thickness), with two patch loads positioned close to the edge, was tested. The deflection values for both ultimate and non-destructive loads were compared with finite element (FE) models of the SLT deck in order to evaluate the behaviour of the deck. The results from the experiments were compared with both linear and non-linear FE models.

Nyckelord: Bridge design, Failure load, Finite element models, Full scale tests, Interlaminar, Interlaminar interface, Non destructive, Non-linear FE, Nonlinear behaviours, Pre-stress, Serviceability limit state, Solid timber, Structural response, Surface moistures, Ultimate limit state, Laminating, Maintenance, Surface roughness, Timber, Bridges

Denna post skapades 2012-09-18.
CPL Pubid: 163519


Institutioner (Chalmers)

Institutionen för bygg- och miljöteknik, Konstruktionsteknik (2005-2017)



Chalmers infrastruktur