Seismic performance of novel prefabricated self-centering shear walls based on UHPC

초록

Conventional reinforced concrete shear walls often exhibit severe damage and large residual deformation during earthquakes, making post-earthquake repair difficult and time-consuming. To improve seismic resilience and repairability, this study proposed two prefabricated self-centering shear wall systems using localized UHPC, replaceable wall-footing components, and post-tensioned tendons or pre-compressed disc spring devices. Cyclic analysis was conducted to evaluate the seismic performance of the specimens, both before and after repair, under staged loading conditions. The test results showed that both systems developed a controlled rocking response and effectively concentrated major damage in replaceable wall-footing components, thereby reducing residual deformation. Following localized repair and component replacement, the repaired-stage specimens regained most of their initial lateral load-carrying capacity and stiffness, thereby validating the efficacy of the repairable wall-footing design. Among the two systems, the tendon-based wall demonstrated higher lateral load-carrying capacity and energy dissipation, while the disc spring-based wall exhibited lower residual displacement and better recentering performance. Furthermore, a mechanics-based analytical model was developed for squat selfcentering walls (aspect ratio <= 2.0), which showed good agreement with test results and outperformed current design code models.

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