Abstract
As part of a research intending to develop steel-concrete hybrid girder using ultra high performance concrete with compressive strength of 80 MPa, this study conducts loading test on this girder to investigate the methods for its composition with a slab using 30 MPa-concrete and the corresponding interfacial behavior. Prior to the loading test, the design formula of the Eurocode for the shear resistance developed in concrete-to-concrete interface is examined for the interface between concrete layers of different strengths. The effect of the surface roughness on the shear resistance is examined using this formula and finite element analysis to verify the applicability of the formula. Based upon the results, loading test is conducted on girder specimens to evaluate the actual behavior with respect to the interfacial surface condition. The test results reveal that the specimen with rough interface could not develop perfectly composite behavior and experienced adhesive failure. In case of simultaneous action of flexure and shear, it appears that conservative design should be applied without consideration of the interfacial condition when determining the arrangement of shear reinforcement.
Highlights
The transfer mechanism of the shear stress developed in a member combining concrete layers with different strengths is very complicated
This study investigated the applicability of the design formula for shear resistance in concrete-to-concrete interface suggested in Eurocode to the case composing concrete layers with two different compressive strengths of 80 MPa and 30 MPa
Finite element analysis was performed to examine the effect of the surface condition of concrete on the shear strength
Summary
The transfer mechanism of the shear stress developed in a member combining concrete layers with different strengths is very complicated. Research on this mechanism started in 1960s like the works of Hanson [1], Birkeland and Birkeland [2], Mattock and Hawkins [3], Walraven and Reinhardt [4] and, Loov and Patrnaik [5] who conducted diverse research on the shear frictional behavior. The design formula for the shear resistance suggested in Eurocode is applied to determine the amount of shear reinforcement for the composition between the casing and the slab This formula does not consider the strength difference between the concrete layers. Verification of Applicability of Eurocode Design Formula by Finite Element Analysis
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