Seismic performance of precast shear wall-slab joint with and without outer longitudinal reinforcement

Composite slabs without outer longitudinal reinforcement are a new option for assembled shear walls, which are easier to be transported. However, their performance, especially their seismic behavior, which is crucial to assembled structures, is still unclear. Furthermore, the effect of whether an additional reinforcement is incorporated, and its length on seismic behavior is also unclear. Therefore, it is necessary to experimentally investigate the seismic behavior of precast shear wall-slab joints without outer longitudinal reinforcement (PNOJ). Five hysteresis test schemes were designed in detail, including a precast joint with outer longitudinal reinforcement (POJ), three precast joints without outer longitudinal reinforcement (PNOJ), and a cast-in situ shear wall-slab joint (CJ). Several critical technologies of production, installation, and connection were systematically summarized. The critical indicators of hysteresis and energy dissipation capacity were revealed by analyzing test phenomena and results. The results demonstrated that the PNOJ had great seismic behavior by incorporating additional reinforcement. Meanwhile, the joint seismic behavior was improved by increasing the additional reinforcement length. As compared to the CJ and POJ, the PNOJ demonstrated good seismic behavior and can be used as a reliable wall-slab connection of assembled reinforced concrete structures.