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The shear transferring mechanisms of steel-concrete shallow-hollow composite beams with various-shaped concrete dowels embedded in concrete slab are different from steel headed-shear studs. In this article, the longitudinal shear resistance of concrete dowel connectors in shallow-hollow composite beams are investigated. The longitudinal shear resistance in theory for concrete dowel connectors applied in this study was based on EN 1992-1-1 and EN 1994-1-1. Push-out tests of four specimens with circle and trapezoidal shaped dowels were conducted, and the test results were compared with shear resistance by theory formula. All of four steel beams were applied with greased to prevent the bond between concrete and steel part. The failure of specimens and the push-out test results were proved that the behavior of concrete dowel in shallow-hollow composite beams was not under pure shear stress. Keywords: shallow-hollow composite beam; circle concrete dowel connectors; trapezoidal concrete dowel connectors; longitudinal shear resistance; shallow floor structure.

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