TY - JOUR
T1 - An analytical model describing the in-plane behaviour of timber diaphragms strengthened with plywood panels
AU - Mirra, Michele
AU - Ravenshorst, Geert
AU - Vries, Peter de
AU - Kuilen, Jan-Willem van de
PY - 2021
Y1 - 2021
N2 - 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.
AB - 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.
KW - Analytical model
KW - Plywood panels
KW - Retrofitting
KW - Seismic rehabilitation
KW - Timber floors
UR - http://www.scopus.com/inward/record.url?scp=85102400347&partnerID=8YFLogxK
U2 - 10.1016/j.engstruct.2021.112128
DO - 10.1016/j.engstruct.2021.112128
M3 - Article
SN - 0141-0296
VL - 235
SP - 1
EP - 15
JO - Engineering Structures
JF - Engineering Structures
M1 - 112128
ER -