Test report on cyclic behaviour of replicated timber diaphragms representing a detached house

Test report on cyclic behaviour of replicated timber diaphragms representing a detached house

Ravenshorst, G.J.P. (TU Delft Bio-based Structures & Materials)
Mirra, M. (TU Delft Bio-based Structures & Materials)

2017

The in-plane strength and stiffness as well as the hysteretic behaviour of timber diaphragms is investigated by performing quasi-static cyclic tests. In this report the behaviour of traditional timber floors and roof configurations was studied representing a typical detached masonry house. The configurations are based on a case study from a detached Groningen house that was demolished.
Characteristics of the demolished house were:
- A detached house, built in 1920
- At ground storey double wythe clay masonry, at first storey single leaf gables of clay masonry
- Timber floors built-up with joists and planks nailed on top of the joists.
- Timber roof with vertical rafters spanning from wall plate to top beam, small horizontal purlins on rafters with vertical planks nailed to the purlins.
Based on the extracted samples the configurations and material properties could be determined. Based on these findings timber diaphragms (floors and roof) were replicated, built from new timber material and fasteners, with the same material properties as found in the extracted samples.
Replicated specimens of approximately 4.0 m by 2.75 m were prepared and tested. After the testing of the replicated specimens representing the situation in practice (non-strengthened), the specimens were strengthened with plywood panels screwed on the timber planks.

Cyclic behaviour
timber diaphragms
existing buildings
Retrofitting interventions

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© 2017 G.J.P. Ravenshorst, M. Mirra