In this paper, we carry out an experiment of timber-steel frameworks to clarify the horizontal deformation capacity of the frameworks. The steel lintel of the framework supports the vertical load. It is confirmed that the frameworks have the deformability to 1/10rad from the experimental results. The PΔ effect is observed. We made it clear that the PΔ effect appears by a half of deformation of a usual framework from the analysis of the model of the framework by which the PΔ effect is considered.
