An analytical model describing the in-plane behaviour of timber diaphragms strengthened with plywood panels

An analytical model describing the in-plane behaviour of timber diaphragms strengthened with plywood panels

Mirra, M. (TU Delft Bio-based Structures & Materials)
Ravenshorst, G.J.P. (TU Delft Bio-based Structures & Materials)
de Vries, P.A. (TU Delft Steel & Composite Structures)
van de Kuilen, J.W.G. (TU Delft Bio-based Structures & Materials; Technische Universität München)

2021

Timber diaphragms in existing buildings are often too flexible in their plane, and can thus potentially cause out-of-plane collapses of walls during earthquakes. A very efficient retrofitting method to increase their in-plane stiffness and energy dissipation is the overlay of plywood panels. However, the usual characterization of the floors by means of a general equivalent shear stiffness cannot account for their nonlinearity and dissipative properties. Therefore, in this work, an analytical model is formulated to describe the in-plane response of timber diaphragms strengthened with plywood panels screwed along their perimeter to the existing sheathing. The proposed formulation starts from the definition of the load-slip equation for a single screw connecting a plank and a plywood panel. The whole floor’s response is then derived, with the prediction of both backbone curve and pinching cycles. From the comparison between the response of tested full-scale diaphragms and the analytically calculated one, it can be concluded that the proposed model accurately predicts the in-plane behaviour and dissipative properties of timber floors retrofitted with plywood panels.

Analytical model
Plywood panels
Retrofitting
Seismic rehabilitation
Timber floors

http://resolver.tudelft.nl/uuid:976324fb-53cb-4332-a57b-51e063466ee9

https://doi.org/10.1016/j.engstruct.2021.112128

0141-0296

Engineering Structures, 235, 1-15

Institutional Repository

journal article

© 2021 M. Mirra, G.J.P. Ravenshorst, P.A. de Vries, J.W.G. van de Kuilen