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Title: Interface Shear Capacity and Flexural Performance of Hybrid Beams

Author(s): Ravi Singh, Yukihiro Sato, Hitoshi Sasaki, David Mukai, and Susumu Kono

Publication: Structural Journal

Volume: 121

Issue: 3

Appears on pages(s): 109-118

Keywords: coefficient of friction; concrete-to-concrete interface; concrete-to-steel interface; flexural capacity; hybrid beam; shear-friction capacity; shear-friction reinforcement; slab-web interface

DOI: 10.14359/51740482

Date: 5/1/2024

This paper introduces details of a new hybrid beam system connected to a reinforced concrete (RC) column. The hybrid beam system is a wide-flange steel beam embedded in RC beams on both ends without any shear connectors. The wide-flange steel beam does not penetrate through the beam-column joint, which reduces the fabrication cost compared to the typical steel beam-RC column hybrid system. A total of 10 hybrid beam specimens were designed with a slab-web interface. Four specimens were used to examine the shear sliding capacity at the slab-web interface, and an equivalent coefficient of friction at the interface, together with a method to evaluate the shear sliding capacity, was proposed. The remaining six specimens were used to examine the flexural capacity and plastic deformation capacity of the hybrid beam, and shear-friction reinforcement details required for ductile flexural behavior were proposed.