Full-scale shaking table test of prefabricated CFSST column frames-strip composite wall structure

In order to investigate the seismic performance of prefabricated concrete-filled square steel tubular column frames-strip composite wall structure, a full-scale shaking table test was performed on a two-story building model. The cumulative damage process of the model in different test cases was analyzed, and the evolution regularities of dynamic characteristic and seismic responses were studied. Results show that, with the peak ground acceleration increases, the fundamental frequency of the model decreases gradually. The damping ratio of model increases gradually before the peak ground acceleration increases to 0.7g but slightly decreases later. The acceleration magnification factor of floor is between 1.2 and 1.8, and is in a decreasing trend. The maximum inter-story drift ratios of model under basis and rare earthquake ground motions of 8-degree are lower than the drift ratio limits according to the design code, and the residual inter-story drift of model is small. The evolution of internal force shows phased characteristics. Before the cracks penetrate to the cover of composite walls, the strip composite walls are the main lateral resistance components, while the internal force of CFSST column frames is small. After the cracks penetrate, the earthquake energy from shaking table is dissipated to some degree by the frictional movement of strip wallboards, so the strip composite walls are the main energy-consuming components. The strip composite walls finally split into several strip wallboards, but the test model still has a strong collapse capacity. In conclusion, the strip composite walls and CFSST column frames maintain coordinated deformation and work together well. The connecting mode with reinforcing bar between column and strip wallboards is stable, which meets the seismic design code requirements. © 2021, Editorial Office of Journal of Building Structures. All right reserved.