Experimental investigation on in-plane structural performance of half-PC slab-wall joints with various reinforcing details

In this study, quasi-static cyclic loading tests were conducted to evaluate the in-plane structural performance of half-precast concrete slab-wall joints. Nine full-scale specimens were fabricated, with key test variables that include the system type, anchorage type, number of anchorage reinforcements, and slab type. The structural performance was assessed in terms of the lateral load-displacement behavior, maximum load capacity, stiffness retention ability, and energy dissipation capacity. The results showed that the monolithic reinforced concrete specimens exhibited superior performance compared to the half-precast concrete specimens. However, the half-precast concrete specimens exceeded the nominal shear strength requirements specified in ACI 318-19. Among the half-precast concrete specimens, the anchorage type and slab type had negligible effects on the overall performance, whereas an increase in the number of anchorage reinforcements unexpectedly resulted in degraded performance. Analysis of the local shear strength of the anchorage reinforcements revealed that those in the half-precast concrete specimens failed to achieve the intended shear capacity, primarily because of insufficient development length. Based on these findings, a modified nominal shear strength model incorporating the anchorage development length was proposed.