Shaking Table Tests on $1/3$-Scale Model of Wooden Horizontal Hybrid Structure

In 2010, the Japanese government issued a law to promote the utilization of wood in public buildings. In response, the Architectural Institute of Japan presented several designs of large-scale wooden structures including a horizontal hybrid type. However, the seismic performance of the hybrid structure was not fully and thoroughly studied, especially in the absence of experimental evidence. Therefore, a series of shaking table tests were conducted in this paper. The specimens consisted of three $1/3$-scale, 3-story, 3-bay, wooden horizontal hybrid structures with diverse shear wall distributions and diaphragm stiffness. The wood part was laterally connected to a relatively rigid steel frame at one end of the longitudinal direction and subjected to a series of artificial ground motions with peak ground accelerations (PGAs) from 0.1 to $0.8g$. The paper introduces the detailed design and test procedure as well as the performances of the specimens. The proposed target drift–based design process was verified to be conservative in this experiment but feasible after modification. It was also found that the increase of diaphragm stiffness significantly improved the performance of the specimen and the concentrated shear walls at the side frame could provide sufficient lateral strength but was more vulnerable to strong seismic scenarios. On the other hand, the acceleration amplifications of the three specimens were higher than normal due to the conservative design and potential bullwhip effect.