Seismic Behavior of Mixed Structure with Steel Frame above Concrete Frame

The mixed structural system that utilizes distinct steel or concrete sub-structures above or below each other has already found its way in some significant buildings around the world. However, the dynamic behavior of this system, especially under seismic excitations, is still not fully understood. Therefore, a twelve-story mixed frame configured with a steel sub-structure on a RC (Reinforced Concrete) sub-structure (S/RC mixed frame) was designed and tested along with a comparative twelve-story RC frame on the shaking table at Tongji University. The seismic behavior of the system was then assessed through the analyses on the dynamic responses under the recorded seismic excitations.