Hysteretic damping of wood framed buildings

The direct-displacement seismic design of wood buildings requires knowledge of the global load-displacement behavior of the building and the variation of the global equivalent viscous damping with displacement amplitude. This paper proposes a simple numerical model for the determination of these parameters. The proposed model is validated with results of shake table tests of a full-scale two-story wood framed house. The model is then used for the monotonic and cyclic pushover analyses of full-scale woodframe buildings, representing various construction qualities. From these analyses, a simple equation is proposed for the variation of the global equivalent viscous damping with building drift.