Abstract
To provide more floor options for the prefabricated steel frame buildings, the authors proposed a prefabricated superimposed slab, which adopts the steel deck as the shear connector and prefabricated formwork, and its flexural performance has been investigated in previous studies. To further study and analyze the longitudinal shear strength of superimposed slabs, the paper constructed and tested twelve full-size recycled aggregate concrete (RAC) superimposed slabs with symmetrical double-line loads. All specimens with the same steel deck and structural details but two different coarse aggregate replacement ratios were measured and compared with the longitudinal shear strength. After the test, the effect factors on the superimposed slabs' bending and longitudinal shear behavior were discussed based on sixty-six finite element (FE) models. Finally, an uncomplicated calculation method for designing longitudinal shear strength is given based on the test and the m-k Method. The reliability and accuracy of this method have been checked with experimental and numerical studies.
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