In this paper, the property of energy conservation and the dynamic responses are analytically examined for the bilinear restoring force characteristics. Next, the restoring force characteristics of wooden frameworks are clarified experimentally. The frameworks have bearing wall elements and steel bar braces that are placed in parallel. The steel bar braces are placed to add the secondary stiffness after yielding of the bearing wall elements of the frameworks. There is a loose hole on the prate at the end of the steel bar brace.
