3.2.2. Prefabricated RACSWs

The horizontal load applied to the specimens of infilled prefabricated RACSWs was transferred to the walls through the ear plates, T-shape connectors, and bolts. In the concrete cracking and yield stages, initial cracking occurred along the diagonal direction of the walls. Horizontal cracks formed at the bottom of the embedded T-shape connectors because of the horizontal shear force. With an increase in horizontal load, the horizontal cracks at the embedded T-shape connectors continued to extend, and principal cracks formed with a width of 3–5 mm. The corner concrete was crushed and began to fall <sup>o</sup>ff. The ear plates had a relative slip with the T-shape connectors. After the peak load, a significant amount of concrete fell <sup>o</sup>ff, thereby exposing the steel bars. Cracks in the horizontal direction formed at the bottom of the wall. The end plates of the semi-rigid joints warped, and the flange of the steel beam of the rigid joint fractured. The column base buckled. The bearing capacity and lateral stiffness of the specimens degraded rapidly. The failure modes are depicted in Figure 9b.

#### *3.3. Transfer Mechanism of Lateral Force*

The failure modes of the specimens indicated that the horizontal load of the SFIRACSWs was resisted by the combined steel frames and infilled RACSWs.
