Longitudinal shear tests and design methods for corrugated steel–concrete composite slabs with recycled coarse aggregate

Abstract

This study aims to investigate the effects of natural coarse aggregate (NCA) replacement ratio and end anchorage conditions on the longitudinal shear performance of corrugated steel-recycled aggregate concrete (CSRAC) composite slabs. Six composite slab specimens were tested to determine their failure mode, bearing capacity, and deformation behavior. A finite element model of CSRAC composite slabs was established using ABAQUS, and its reliability was validated based on the experimental results. A parametric analysis was conducted to determine the effects of each key parameter on the longitudinal shear performance of CSRAC composite slabs. A design method for the longitudinal shear capacity of CSRAC composite slabs was proposed, taking into account the NCA replacement ratio. The experimental results revealed that the incorporation of end anchorages can significantly improve the longitudinal shear performance of CSRAC composite slabs, resulting in an increase of 45.06% and 62.34% in ultimate bearing capacity for specimens with NCA replacement ratios of 50% and 100%, respectively, when compared to those without end anchorages. As the NCA replacement ratio increases, the longitudinal shear capacity of CSRAC composite slabs decreases. The reduction in longitudinal shear capacity was found to be 2.75%-4.98% and 5.55%-10.02% for specimens with 50% and 100% NCA replacement ratios, respectively, when compared to natural aggregate concrete (NAC) specimens. The NCA replacement ratio is a significant parameter that affects the longitudinal shear performance of CSRAC composite slabs and the proposed design method based on the m-k method for the longitudinal shear capacity of composite slabs can accurately predict the longitudinal shear capacity of CSRAC composite slabs by considering the NCA replacement ratio.